18024( 3) - 04-Dec-2025 15:38:28 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 18024 Version: 3 Check-in Time: 04-Dec-2025 15:38:28 STScI Edit Number: 0 Title Untangling the stellar content of the NGC 6822 Hubble regions with the unique WFC3/IR filters ------------------------------------------------------------------------------------ Type Cycle GO 33 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Olivia Jones United Kingdom Astronomy Technology Centre Y CoI: Dir. Margaret Meixner Jet Propulsion Laboratory N CoI: Dr. Alec S. Hirschauer Morgan State University N CoI: Mr. Conor Nally 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: Dr. Laura Lenkic California Institute of Technology N CoI: Dr. Isha Nayak NASA Goddard Space Flight Center N CoI: Dr. Chiara Crociati University of Edinburgh, Institute for N Astronomy CoI: Ms. Gracie McGill University of Edinburgh, Institute for N Astronomy CoI: Prof. Annette Ferguson University of Edinburgh, Institute for N Astronomy CoI: Dr. Martha L. Boyer Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract With the unique WFC3/IR medium band filters we will image massive star-formation regions (Hubble I/III, IV, V, X) in the low-metallicity dwarf galaxy NGC 6822. These regions, spanning various evolutionary stages, provide a temporal sequence of star formation under conditions analogous to the early Universe. This high-resolution HST data will be combined with existing JWST and ALMA observations to study star formation, stellar feedback, and dust evolution in this system. A central challenge is distinguishing young stellar objects in the Hubble regions from the significant population of evolved stars in the NGC 6822 field, which overlap in colour space. The unique WFC3/IR filters, sensitive to H2O absorption in M-type AGB stars and the CN+C2 features in Carbon stars, break this degeneracy. It will even determine AGB star chemistries from which we can quantify their dust production. Given the significant roles of evolved stars in the chemical enrichment of the interstellar medium (ISM) and young massive stars in shaping their environments through intense radiative feedback, jets and winds, detailed observations of the interplay of these populations in nearby systems where CO cores and atomic gas have also been resolved on 1--3 pc scales is essential. By characterizing the stars physical properties via SED modeling and their effects on the HII regions in NGC 6822, we can refine our understanding of massive star formation and the dust lifecycle in chemically unenriched environments. ------------------------------------------------------------------------------------ Observations Description ------------------------ 18024( 3) - 04-Dec-2025 15:38:28 - [ 2] We are imaging four metal-poor star-forming (SF) regions (Hubble I/III, Hubble IV, Hubble V, and Hubble X) with WFC3/IR medium band filters . Our observations aim to conduct a census of massive young stellar objects (YSOs) and asymptotic giant branch (AGB) stars, and characterize their properties with spectral energy distribution (SED) model fitting in effort to better understand star formation and dust production mechanics, as well as massive star cluster evolution, in an extragalactic system which mimics the metal-poor nature of early-universe SF galaxies. Filters: To take full advantage of the CN+C2 and water features near 1.4 microns, we 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 Parallels: There are no parallel observations for this program. Scheduling Constraints: There are no scheduling constrains for this program. ------------------------------------------------------------------------------------ 18024( 3) - 04-Dec-2025 15:38:28 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-6822-HUB GALAXY, STAR FORMING RA=19H44M52.8960S, J2000 V = 8.1 BLE-V REGION DEC=-14D43'4.80" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-6822-HUB GALAXY, STAR FORMING RA=19H45M5.3520S, J2000 V = 8.1 BLE-X REGION DEC=-14D43'17.76" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-6822-HUB GALAXY, STAR FORMING RA=19H44M49.8240S, J2000 V = 8.1 BLE-IV REGION DEC=-14D52'45.48" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-6822-HUB GALAXY, STAR FORMING RA=19H44M33.5700S, J2000 V = 8.1 BLE-I-III REGION DEC=-14D42'15.20" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 18024( 3) - 04-Dec-2025 15:38:28 - [ 4] Visit: 01 (NGC-6822-HUBBLE-V) Visit Requirements: On Hold Comments: Additional Comments: -All three medium-band filters (F127M, F139M, F153M), in field. -~800s exposures per filter, using the STEP200 timing sequences. NSAMP = 8 -Using a 4pt dither for F127M, F139M and F153M. -Exposures arranged to avoid latency due to buffer dump. -Total of one orbit 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-HU WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.542, 0.182 BBLE-V CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-6822-HU WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.542, 0.182 BBLE-V CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-6822-HU WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.542, 0.182 BBLE-V CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-6822-HU WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -0.203, 0.303 BBLE-V CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-6822-HU WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -0.203, 0.303 BBLE-V CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-6822-HU WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -0.203, 0.303 BBLE-V CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC-6822-HU WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0, 0 BBLE-V CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC-6822-HU WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0, 0 BBLE-V CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 9 NGC-6822-HU WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0, 0 BBLE-V CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC-6822-HU WFC3/IR MULTIAC IR F127M NSAMP=7, SAMP-SEQ=STEP200 1 DEF POS TARG 0.339, 0.485 BBLE-V CUM (99.231 S) 18024( 3) - 04-Dec-2025 15:38:28 - [ 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 ------------------------------------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC-6822-HU WFC3/IR MULTIAC IR F139M NSAMP=7, SAMP-SEQ=STEP200 1 DEF POS TARG 0.339, 0.485 BBLE-V CUM (99.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 12 NGC-6822-HU WFC3/IR MULTIAC IR F153M NSAMP=7, SAMP-SEQ=STEP200 1 DEF POS TARG 0.339, 0.485 BBLE-V CUM (99.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 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-HUBBLE-V 1 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822-HUBBLE-V 2 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822-HUBBLE-V 3 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822-HUBBLE-V 4 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822-HUBBLE-V 5 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822-HUBBLE-V 6 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822-HUBBLE-V 7 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822-HUBBLE-V 8 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822-HUBBLE-V 9 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822-HUBBLE-V 10 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822-HUBBLE-V 11 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822-HUBBLE-V 12 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM 18024( 3) - 04-Dec-2025 15:38:28 - [ 6] Visit: 02 (NGC-6822-HUBBLE-X) Visit Requirements: On Hold Comments: Additional Comments: -All three medium-band filters (F127M, F139M, F153M), in field. -~800s exposures per filter, using the STEP200 timing sequences. NSAMP = 8 -Using a 4pt dither for F127M, F139M and F153M. -Exposures arranged to avoid latency due to buffer dump. -Total of one orbit 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-HU WFC3/IR MULTIAC IR F127M NSAMP=7, SAMP-SEQ=STEP200 1 DEF POS TARG 0.339, 0.485 BBLE-X CUM (99.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-6822-HU WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.542, 0.182 BBLE-X CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-6822-HU WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.542, 0.182 BBLE-X CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-6822-HU WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.542, 0.182 BBLE-X CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-6822-HU WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -0.203, 0.303 BBLE-X CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-6822-HU WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -0.203, 0.303 BBLE-X CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC-6822-HU WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -0.203, 0.303 BBLE-X CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC-6822-HU WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0, 0 BBLE-X CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 9 NGC-6822-HU WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0, 0 BBLE-X CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC-6822-HU WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0, 0 BBLE-X CUM (199.231 S) 18024( 3) - 04-Dec-2025 15:38:28 - [ 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 ------------------------------------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC-6822-HU WFC3/IR MULTIAC IR F139M NSAMP=7, SAMP-SEQ=STEP200 1 DEF POS TARG 0.339, 0.485 BBLE-X CUM (99.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 12 NGC-6822-HU WFC3/IR MULTIAC IR F153M NSAMP=7, SAMP-SEQ=STEP200 1 DEF POS TARG 0.339, 0.485 BBLE-X CUM (99.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 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-HUBBLE-X 1 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822-HUBBLE-X 2 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822-HUBBLE-X 3 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822-HUBBLE-X 4 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822-HUBBLE-X 5 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822-HUBBLE-X 6 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822-HUBBLE-X 7 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822-HUBBLE-X 8 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822-HUBBLE-X 9 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822-HUBBLE-X 10 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822-HUBBLE-X 11 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822-HUBBLE-X 12 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM 18024( 3) - 04-Dec-2025 15:38:28 - [ 8] Visit: 03 (NGC-6822-HUBBLE-IV) Visit Requirements: On Hold Comments: Additional Comments: -All three medium-band filters (F127M, F139M, F153M), in field. -~800s exposures per filter, using the STEP200 timing sequences. NSAMP = 8 -Using a 4pt dither for F127M, F139M and F153M. -Exposures arranged to avoid latency due to buffer dump. -Total of one orbit 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-HU WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.542, 0.182 BBLE-IV CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-6822-HU WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.542, 0.182 BBLE-IV CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-6822-HU WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.542, 0.182 BBLE-IV CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-6822-HU WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -0.203, 0.303 BBLE-IV CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-6822-HU WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -0.203, 0.303 BBLE-IV CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-6822-HU WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -0.203, 0.303 BBLE-IV CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC-6822-HU WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0, 0 BBLE-IV CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC-6822-HU WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0, 0 BBLE-IV CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 9 NGC-6822-HU WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0, 0 BBLE-IV CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC-6822-HU WFC3/IR MULTIAC IR F127M NSAMP=7, SAMP-SEQ=STEP200 1 DEF POS TARG 0.339, 0.485 BBLE-IV CUM (99.231 S) 18024( 3) - 04-Dec-2025 15:38:28 - [ 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 ------------------------------------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC-6822-HU WFC3/IR MULTIAC IR F139M NSAMP=7, SAMP-SEQ=STEP200 1 DEF POS TARG 0.339, 0.485 BBLE-IV CUM (99.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 12 NGC-6822-HU WFC3/IR MULTIAC IR F153M NSAMP=7, SAMP-SEQ=STEP200 1 DEF POS TARG 0.339, 0.485 BBLE-IV CUM (99.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 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-HUBBLE-IV 1 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822-HUBBLE-IV 2 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822-HUBBLE-IV 3 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822-HUBBLE-IV 4 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822-HUBBLE-IV 5 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822-HUBBLE-IV 6 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822-HUBBLE-IV 7 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822-HUBBLE-IV 8 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822-HUBBLE-IV 9 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM NGC-6822-HUBBLE-IV 10 WFC3/IR MULTIAC IR F127M none none none none 1 N/A CUM NGC-6822-HUBBLE-IV 11 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM NGC-6822-HUBBLE-IV 12 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM 18024( 3) - 04-Dec-2025 15:38:28 - [ 10] Visit: 05 (NGC-6822-HUBBLE-1-III) Visit Requirements: On Hold Comments: Additional Comments: -All three medium-band filters (F127M, F139M, F153M), in field. -~800s exposures per filter, using the STEP200 timing sequences. NSAMP = 8 -Using a 4pt dither for F127M, F139M and F153M. -Exposures arranged to avoid latency due to buffer dump. -Total of one orbit 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-HU WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.542, 0.182 BBLE-I-III CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-6822-HU WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.542, 0.182 BBLE-I-III CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-6822-HU WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0.542, 0.182 BBLE-I-III CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-6822-HU WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -0.203, 0.303 BBLE-I-III CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-6822-HU WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -0.203, 0.303 BBLE-I-III CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-6822-HU WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG -0.203, 0.303 BBLE-I-III CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC-6822-HU WFC3/IR MULTIAC IR F127M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0, 0 BBLE-I-III CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC-6822-HU WFC3/IR MULTIAC IR F139M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0, 0 BBLE-I-III CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 9 NGC-6822-HU WFC3/IR MULTIAC IR F153M NSAMP=8, SAMP-SEQ=STEP200 1 DEF POS TARG 0, 0 BBLE-I-III CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC-6822-HU WFC3/IR MULTIAC IR F127M NSAMP=7, SAMP-SEQ=STEP200 1 DEF POS TARG 0.339, 0.485 BBLE-I-III CUM (99.231 S) 18024( 3) - 04-Dec-2025 15:38:28 - [ 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 ------------------------------------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC-6822-HU WFC3/IR MULTIAC IR F139M NSAMP=7, SAMP-SEQ=STEP200 1 DEF POS TARG 0.339, 0.485 BBLE-I-III CUM (99.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 12 NGC-6822-HU WFC3/IR MULTIAC IR F153M NSAMP=7, SAMP-SEQ=STEP200 1 DEF POS TARG 0.339, 0.485 BBLE-I-III CUM (99.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 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-HUBBLE-I-I 1 WFC3/IR MULTIAC IR F127M none none none none 1 N/A II CUM NGC-6822-HUBBLE-I-I 2 WFC3/IR MULTIAC IR F139M none none none none 1 N/A II CUM NGC-6822-HUBBLE-I-I 3 WFC3/IR MULTIAC IR F153M none none none none 1 N/A II CUM NGC-6822-HUBBLE-I-I 4 WFC3/IR MULTIAC IR F127M none none none none 1 N/A II CUM NGC-6822-HUBBLE-I-I 5 WFC3/IR MULTIAC IR F139M none none none none 1 N/A II CUM NGC-6822-HUBBLE-I-I 6 WFC3/IR MULTIAC IR F153M none none none none 1 N/A II CUM NGC-6822-HUBBLE-I-I 7 WFC3/IR MULTIAC IR F127M none none none none 1 N/A II CUM NGC-6822-HUBBLE-I-I 8 WFC3/IR MULTIAC IR F139M none none none none 1 N/A II CUM NGC-6822-HUBBLE-I-I 9 WFC3/IR MULTIAC IR F153M none none none none 1 N/A II CUM NGC-6822-HUBBLE-I-I 10 WFC3/IR MULTIAC IR F127M none none none none 1 N/A II CUM NGC-6822-HUBBLE-I-I 11 WFC3/IR MULTIAC IR F139M none none none none 1 N/A II CUM NGC-6822-HUBBLE-I-I 12 WFC3/IR MULTIAC IR F153M none none none none 1 N/A II CUM 18024( 3) - 04-Dec-2025 15:38:28 - [ 12] Summary Form for Proposal 18024 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=7, NSAMP=8, SAMP-SEQ=STEP200 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements POS TARG -0.203, 0.303, POS TARG 0, 0, POS TARG 0.339, 0.485, POS TARG 0.542, 0.182 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F127M, F139M, F153M ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC-6822-HUBBLE-I-III, NGC-6822-HUBBLE-IV, NGC-6822-HUBBLE-V, NGC-6822-HUBBLE-X ------------------------------------------------------------------------------------------------------------------------------------