17910( 6) - 14-Jan-2026 18:55:15 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17910 Version: 6 Check-in Time: 14-Jan-2026 18:55:15 STScI Edit Number: 2 Title Silicates vs Carbon dust in NGC 6822: determining stellar dust types with WFC3/IR's unique filters ------------------------------------------------------------------------------------ Type Cycle GO 32 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Olivia Jones United Kingdom Astronomy Technology Centre Y CoI: Dr. Alec S. Hirschauer Morgan State University N CoI: Dr. Martha L. Boyer Space Telescope Science Institute N CoI: Prof. Annette Ferguson University of Edinburgh, Institute for N Astronomy CoI: Dr. Nolan Habel Jet Propulsion Laboratory N CoI: Ms. Jess Howell University of Edinburgh, Institute for N Astronomy CoI: Mr. Conor Nally University of Edinburgh, Institute for N Astronomy CoI: Dr. Patrick Kavanagh National University of Ireland, Maynooth N CoI: Dr. Laura Lenkic California Institute of Technology N CoI: Dir. Margaret Meixner Jet Propulsion Laboratory N CoI: Dr. Isha Nayak NASA Goddard Space Flight Center N ------------------------------------------------------------------------------------ Abstract Asymptotic Giant Branch (AGB) stars are important drivers of the chemical enrichment of the interstellar medium (ISM) in galaxies. They can form carbonaceous and silicate dust at metallicities as low as 0.6% solar, and can potentially inject mass into the ISM of galaxies 30 Myr after they form. The two species (C- and M-type) are split by different dominant surface chemistry (carbon- and oxygen-rich respectively) which affects the dust grains formed, dust mass, opacity and mass-loss efficiency and in turn, causes them to evolve at different rates. Disentangling these two species is key to understanding the effects they have on their environment. JWST imaged the local dwarf galaxy NGC 6822 and identified ~1200 candidate AGB stars. However, it has been shown that JWST medium- and wide-band photometry is not effective at identifying the chemistry of these stars, especially in low metallicity environments. HST can rectify this. With WFC3/IR F127M, F139M and F153M imaging of the same area, we can reliably constrain the stellar chemistry for SED fitting using the broad baseline (1-21 micron) photometry from JWST. This ensures accurate dust mass and type measurements to assess the contribution that AGB stars have to the dust budget in the early Universe. In addition this will provide validation to the method of identifying AGB species with JWST SED models. ------------------------------------------------------------------------------------ Observations Description ------------------------ Targets: We will target 6 fields in NGC6822 that overlaps with JWST GTO #1234 coverage. Filters: To take full advantage of the CN+C2 and water features near 1.4 microns, we 17910( 6) - 14-Jan-2026 18:55:15 - [ 2] require observations with F127M, F139M, and F153M. All three filters are necessary, since combinations with the broad-band optical, near-IR, and IR filters do not successfully isolate the carbon stars. Required exposure times and photometric depth: To detect all AGB stars, we must achieve full photometric completeness at the tip of the red giant branch (TRGB). The orbit time for our target is 52 min, so we can achieve the necessary photometric depth within a single orbit (as demonstrated by Boyer et al. 2013). This allows for total exposure times of 700-800s in each filter, resulting in S/N > 10 in F127M for Ko=17.5mag, using a Bruzual template for an M6III star, simulating a TRGB star in the galaxy. Dithering Strategy: Dithering diminishes errors associated with where a source is placed on a pixel, undersampling of the WFC3/IR channel, and image artifacts such as cosmic rays. We choose a 4-point dithering strategy to acheive Nyquist sampling of the PSF & to simultaneously allow us to fit the three selected filters into a single orbit. We have entered the dither offsets manually into the target offset entries following the WFC3 handbook WFC3-IR-DITHER-BOX-MIN values from table C.3 Avoiding Saturation: There are ~10 known stars in the field-of-view that are brighter than Ko=13.5mag saturation limit of the longest exposure (199s). From the sample of >1millions stars, these sources will not affect the science of our program. Other bright stars in the field will be recovered by the WFC3/IR MULTIACCUM sampling. Parallels: There are no parallel observations for this program. Scheduling Constraints: There are no scheduling constrains for this program. ------------------------------------------------------------------------------------ 17910( 6) - 14-Jan-2026 18:55:15 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-6822 GALAXY, STAR FORMING RA=19H44M56.5326S, J2000 V = 8.1 REGION, UNDESIGNATED DEC=-14D48'7.88" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 17910( 6) - 14-Jan-2026 18:55:15 - [ 4] Visit: 01 Visit Requirements: ORIENT 226D TO 231 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-6822 WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -127.91358, CUM (199.231 -56.690399999999975 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-6822 WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -127.91358, CUM (199.231 -56.690399999999975 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-6822 WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -127.91358, CUM (199.231 -56.690399999999975 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-6822 WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -127.37158, CUM (199.231 -56.50839999999997 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-6822 WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -127.37158, CUM (199.231 -56.50839999999997 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-6822 WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -127.37158, CUM (199.231 -56.50839999999997 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC-6822 WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -127.57458, CUM (199.231 -56.205399999999976 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC-6822 WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -127.57458, CUM (199.231 -56.205399999999976 S) ------------------------------------------------------------------------------------------------------------------------------------ 9 NGC-6822 WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -127.57458, CUM (199.231 -56.205399999999976 S) ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC-6822 WFC3/IR MULTIAC IR F127M NSAMP=7, SAMP-SEQ=STEP100 1 DEF POS TARG -128.11658, CUM (99.231 S) -56.38739999999998 ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC-6822 WFC3/IR MULTIAC IR F139M NSAMP=7, SAMP-SEQ=STEP100 1 DEF POS TARG -128.11658, CUM (99.231 S) -56.38739999999998 ------------------------------------------------------------------------------------------------------------------------------------ 17910( 6) - 14-Jan-2026 18:55:15 - [ 5] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 12 NGC-6822 WFC3/IR MULTIAC IR F153M NSAMP=7, SAMP-SEQ=STEP100 1 DEF POS TARG -128.11658, CUM (99.231 S) -56.38739999999998 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-6822 1 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822 2 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822 3 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822 4 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822 5 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822 6 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822 7 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822 8 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822 9 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822 10 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822 11 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822 12 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM 17910( 6) - 14-Jan-2026 18:55:15 - [ 6] Visit: 02 Visit Requirements: SAME ORIENT AS 01 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-6822 WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.0, CUM (199.231 -56.690399999999975 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-6822 WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.0, CUM (199.231 -56.690399999999975 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-6822 WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.0, CUM (199.231 -56.690399999999975 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-6822 WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.542, CUM (199.231 -56.50839999999997 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-6822 WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.542, CUM (199.231 -56.50839999999997 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-6822 WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.542, CUM (199.231 -56.50839999999997 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC-6822 WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.339, CUM (199.231 -56.205399999999976 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC-6822 WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.339, CUM (199.231 -56.205399999999976 S) ------------------------------------------------------------------------------------------------------------------------------------ 9 NGC-6822 WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.339, CUM (199.231 -56.205399999999976 S) ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC-6822 WFC3/IR MULTIAC IR F127M NSAMP=7, SAMP-SEQ=STEP100 1 DEF POS TARG -0.203, CUM (99.231 S) -56.38739999999998 ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC-6822 WFC3/IR MULTIAC IR F139M NSAMP=7, SAMP-SEQ=STEP100 1 DEF POS TARG -0.203, CUM (99.231 S) -56.38739999999998 ------------------------------------------------------------------------------------------------------------------------------------ 17910( 6) - 14-Jan-2026 18:55:15 - [ 7] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 12 NGC-6822 WFC3/IR MULTIAC IR F153M NSAMP=7, SAMP-SEQ=STEP100 1 DEF POS TARG -0.203, CUM (99.231 S) -56.38739999999998 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-6822 1 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822 2 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822 3 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822 4 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822 5 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822 6 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822 7 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822 8 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822 9 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822 10 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822 11 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822 12 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM 17910( 6) - 14-Jan-2026 18:55:15 - [ 8] Visit: 03 Visit Requirements: SAME ORIENT AS 01 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-6822 WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 127.91358, CUM (199.231 -56.690399999999975 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-6822 WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 127.91358, CUM (199.231 -56.690399999999975 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-6822 WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 127.91358, CUM (199.231 -56.690399999999975 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-6822 WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 128.45558, CUM (199.231 -56.50839999999997 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-6822 WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 128.45558, CUM (199.231 -56.50839999999997 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-6822 WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 128.45558, CUM (199.231 -56.50839999999997 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC-6822 WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 128.25258, CUM (199.231 -56.205399999999976 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC-6822 WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 128.25258, CUM (199.231 -56.205399999999976 S) ------------------------------------------------------------------------------------------------------------------------------------ 9 NGC-6822 WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 128.25258, CUM (199.231 -56.205399999999976 S) ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC-6822 WFC3/IR MULTIAC IR F127M NSAMP=7, SAMP-SEQ=STEP100 1 DEF POS TARG 127.71058, CUM (99.231 S) -56.38739999999998 ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC-6822 WFC3/IR MULTIAC IR F139M NSAMP=7, SAMP-SEQ=STEP100 1 DEF POS TARG 127.71058, CUM (99.231 S) -56.38739999999998 ------------------------------------------------------------------------------------------------------------------------------------ 17910( 6) - 14-Jan-2026 18:55:15 - [ 9] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 12 NGC-6822 WFC3/IR MULTIAC IR F153M NSAMP=7, SAMP-SEQ=STEP100 1 DEF POS TARG 127.71058, CUM (99.231 S) -56.38739999999998 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-6822 1 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822 2 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822 3 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822 4 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822 5 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822 6 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822 7 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822 8 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822 9 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822 10 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822 11 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822 12 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM 17910( 6) - 14-Jan-2026 18:55:15 - [ 10] Visit: 04 Visit Requirements: SAME ORIENT AS 01 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-6822 WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -127.91358, CUM (199.231 56.69039999999996 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-6822 WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -127.91358, CUM (199.231 56.69039999999996 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-6822 WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -127.91358, CUM (199.231 56.69039999999996 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-6822 WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -127.37158, CUM (199.231 56.87239999999996 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-6822 WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -127.37158, CUM (199.231 56.87239999999996 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-6822 WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -127.37158, CUM (199.231 56.87239999999996 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC-6822 WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -127.57458, CUM (199.231 57.17539999999996 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC-6822 WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -127.57458, CUM (199.231 57.17539999999996 S) ------------------------------------------------------------------------------------------------------------------------------------ 9 NGC-6822 WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -127.57458, CUM (199.231 57.17539999999996 S) ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC-6822 WFC3/IR MULTIAC IR F127M NSAMP=7, SAMP-SEQ=STEP100 1 DEF POS TARG -128.11658, CUM (99.231 S) 56.99339999999996 ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC-6822 WFC3/IR MULTIAC IR F139M NSAMP=7, SAMP-SEQ=STEP100 1 DEF POS TARG -128.11658, CUM (99.231 S) 56.99339999999996 ------------------------------------------------------------------------------------------------------------------------------------ 17910( 6) - 14-Jan-2026 18:55:15 - [ 11] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 12 NGC-6822 WFC3/IR MULTIAC IR F153M NSAMP=7, SAMP-SEQ=STEP100 1 DEF POS TARG -128.11658, CUM (99.231 S) 56.99339999999996 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-6822 1 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822 2 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822 3 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822 4 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822 5 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822 6 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822 7 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822 8 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822 9 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822 10 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822 11 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822 12 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM 17910( 6) - 14-Jan-2026 18:55:15 - [ 12] Visit: 05 Visit Requirements: SAME ORIENT AS 01 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-6822 WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.0, CUM (199.231 56.69039999999996 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-6822 WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.0, CUM (199.231 56.69039999999996 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-6822 WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.0, CUM (199.231 56.69039999999996 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-6822 WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.542, CUM (199.231 56.87239999999996 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-6822 WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.542, CUM (199.231 56.87239999999996 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-6822 WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.542, CUM (199.231 56.87239999999996 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC-6822 WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.339, CUM (199.231 57.17539999999996 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC-6822 WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.339, CUM (199.231 57.17539999999996 S) ------------------------------------------------------------------------------------------------------------------------------------ 9 NGC-6822 WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.339, CUM (199.231 57.17539999999996 S) ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC-6822 WFC3/IR MULTIAC IR F127M NSAMP=7, SAMP-SEQ=STEP100 1 DEF POS TARG -0.203, CUM (99.231 S) 56.99339999999996 ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC-6822 WFC3/IR MULTIAC IR F139M NSAMP=7, SAMP-SEQ=STEP100 1 DEF POS TARG -0.203, CUM (99.231 S) 56.99339999999996 ------------------------------------------------------------------------------------------------------------------------------------ 17910( 6) - 14-Jan-2026 18:55:15 - [ 13] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 12 NGC-6822 WFC3/IR MULTIAC IR F153M NSAMP=7, SAMP-SEQ=STEP100 1 DEF POS TARG -0.203, CUM (99.231 S) 56.99339999999996 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-6822 1 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822 2 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822 3 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822 4 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822 5 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822 6 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822 7 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822 8 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822 9 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822 10 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822 11 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822 12 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM 17910( 6) - 14-Jan-2026 18:55:15 - [ 14] Visit: 06 Visit Requirements: SAME ORIENT AS 01 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-6822 WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 127.91358, CUM (199.231 56.69039999999996; GS S) ACQ SCENARIO ONEB1OR ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-6822 WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 127.91358, CUM (199.231 56.69039999999996 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-6822 WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 127.91358, CUM (199.231 56.69039999999996 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-6822 WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 128.45558, CUM (199.231 56.87239999999996 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-6822 WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 128.45558, CUM (199.231 56.87239999999996 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-6822 WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 128.45558, CUM (199.231 56.87239999999996 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC-6822 WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 128.25258, CUM (199.231 57.17539999999996 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC-6822 WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 128.25258, CUM (199.231 57.17539999999996 S) ------------------------------------------------------------------------------------------------------------------------------------ 9 NGC-6822 WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 128.25258, CUM (199.231 57.17539999999996 S) ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC-6822 WFC3/IR MULTIAC IR F127M NSAMP=7, SAMP-SEQ=STEP100 1 DEF POS TARG 127.71058, CUM (99.231 S) 56.99339999999996 ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC-6822 WFC3/IR MULTIAC IR F139M NSAMP=7, SAMP-SEQ=STEP100 1 DEF POS TARG 127.71058, CUM (99.231 S) 56.99339999999996 ------------------------------------------------------------------------------------------------------------------------------------ 17910( 6) - 14-Jan-2026 18:55:15 - [ 15] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 12 NGC-6822 WFC3/IR MULTIAC IR F153M NSAMP=7, SAMP-SEQ=STEP100 1 DEF POS TARG 127.71058, CUM (99.231 S) 56.99339999999996 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-6822 1 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822 2 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822 3 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822 4 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822 5 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822 6 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822 7 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822 8 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822 9 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822 10 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822 11 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822 12 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM 17910( 6) - 14-Jan-2026 18:55:15 - [ 16] Summary Form for Proposal 17910 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=7, NSAMP=8, SAMP-SEQ=STEP100, SAMP-SEQ=STEP200 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GS ACQ SCENARIO ONEB1OR, ORIENT 226D TO 231 D, POS TARG -0.203, -56.38739999999998, POS TARG -0.203, 56.99339999999996, POS TARG -127.37158, -56.50839999999997, POS TARG -127.37158, 56.87239999999996, POS TARG -127.57458, -56.205399999999976, POS TARG -127.57458, 57.17539999999996, POS TARG -127.91358, -56.690399999999975, POS TARG -127.91358, 56.69039999999996, POS TARG -128.11658, -56.38739999999998, POS TARG -128.11658, 56.99339999999996, POS TARG 0.0, -56.690399999999975, POS TARG 0.0, 56.69039999999996, POS TARG 0.339, -56.205399999999976, POS TARG 0.339, 57.17539999999996, POS TARG 0.542, -56.50839999999997, POS TARG 0.542, 56.87239999999996, POS TARG 127.71058, -56.38739999999998, POS TARG 127.71058, 56.99339999999996, POS TARG 127.91358, -56.690399999999975, POS TARG 127.91358, 56.69039999999996, POS TARG 128.25258, -56.205399999999976, POS TARG 128.25258, 57.17539999999996, POS TARG 128.45558, -56.50839999999997, POS TARG 128.45558, 56.87239999999996, SAME ORIENT AS 01 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F127M, F139M, F153M ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC-6822 ------------------------------------------------------------------------------------------------------------------------------------