INVALID GS ACQ SCENARIO SPECIAL REQUIREMENTSubmit 05. - Reversed the order of G102 and G141 for Visit05.-1581193107----- Attempting Submission 1 (Fri Jul 18 15:47:50 GMT 2025) -----
HST Phase II Proposal 17968 successfully submitted.
Receipt: # 17968-1
----- Attempting Submission 2 (Fri Jan 16 15:08:14 GMT 2026) -----
----- Attempting Submission 3 (Tue Feb 10 16:51:30 GMT 2026) -----
----- Attempting Submission 4 (Fri Mar 13 14:00:08 GMT 2026) -----
----- Attempting Submission 5 (Fri Mar 27 17:01:26 GMT 2026) -----Updated list of investigators for Cycle 33.WFC3 IR Grism Flux/Trace CalibrationThis program will observe GD-153, GD-71, GRW+70, and P330E to verify the flux calibration near the center of the field (-20, 0) and a few other positions using the WFC3 IR G102 and G141 grisms. These calibrations will be compared with those derived from previous programs:
17688 (GD-153, GD-71, GRW+70, P330E),
17367 (GD-153, GD-71, GRW+70),
17018 (GD-153, GD-71, GRW+70),
16583 (GD-153, GD-71, GRW+70),
16408 (GD-153, GD-71, GRW+70),
15728 (GD-153),
15587 (GD-153),
14994 (GD-153),
14544 (GD-153),
14386 (GD-153),
14024 (GD-71),
13579 (GD-153),
13092 (GD-153),
12702 (GD-71),
12357 (GD-71),
11937 (GD-71)
to check for any time evolution. The data will also be used to calculate wavelength solutions for the grisms and to check for time-dependent sensitivity evolution of the G102 and G141 observing modes.Observations of GD-153 to verify the flux calibration near the center of the field and at a few other previously observed positions using the WFC3 IR G102 and G141 grisms. These calibrations will be compared with those derived from previous programs. The data will also be used to calculate wavelength solutions for the grisms, and will be used to check time-dependent sensitivity of G102 and G141 observing modes. Observations will be taken with postargs of (-20,-0) (-20,+15) (-20,-15).
Observations of GD-71 to verify the flux calibration near the center of the field and at a few other previously observed positions using the WFC3 IR G102 and G141 grisms. These calibrations will be compared with those derived from previous programs. The data will also be used to calculate wavelength solutions for the grisms, and will be used to check time-dependent sensitivity of G102 and G141 observing modes. Observations will be taken with postargs of (-20,-0) (-20,+15) (-20,-15) (-40,+0). Direct imaging done with only one imaging filter: F098M for G102 and F140W for G141. ORIENT restrictions applied to minimize contamination in this crowded field.
Observations of GRW+70 to verify the flux calibration near the center of the field and at a few other previously observed positions using the WFC3 IR G102 and G141 grisms. These calibrations will be compared with those derived from previous programs. The data will also be used to calculate wavelength solutions for the grisms, and will be used to check time-dependent sensitivity of G102 and G141 observing modes. Observations will be taken with postargs of (-20,-0) (-20,+15) (-20,-15) (-40,+0). Direct imaging done with only one imaging filter: F098M for G102 and F140W for G141. ORIENT restrictions applied to avoid contamination.
The original flux monitor observed GD71 and GD153 at a range of detector positions but was reduced to a single orbit of GD153 based on the stability of the initial calibration. Using a longer time baseline, a decrease in sensitivity of ~0.1% per year has been measured, so GRW+70 was added (and GD71 resumed) to more accurately track these time-dependent losses.
The G-type standard P330E was revisited in early 2025 with 2 orbits to check the TDS. This flux standard has only a small set of grism observations compared to the white dwarfs and is of interest for cross-misson flux calibration. Two orbits are requested this cycle, as in Cycle 32.0falsefalsefalseRESTRICTEDSTARDAAccording to ISR WFC3-2011-05, GD-153 is used as the primary flux calibrator for the WFC3 IR grisms.J2000J2000STARDAGD-71 is a primary HST flux standard that has been used in the past to calibrate the NICMOS and ACS grism modes, which provides us with the ability to cross-calibrate between instruments. GD-71 is specifically chosen for the WFC3 IR grism calibration because it will provide an aditional flux calibration target (GD-153 is used in SMOV for the IR grism calibration), so that the calibration is not based on a single target. An additional calibration target also minimizes the potential for problems from other nearby sources in the field.
The original flux monitor observed GD71 and GD153 at a range of detector positions but was reduced to a single orbit of GD153 based on the stability of the initial calibration. Using a longer time baseline, a decrease in sensitivity of ~0.1% per year has been measured, so GRW+70 was added (and GD71 resumed) to more accurately track these time-dependent losses.J2000J2000CALIBRATIONPHOTOMETRICGRW+70 is specifically chosen for the WFC3 IR grism calibration because it will provide an aditional flux calibration target (GD-153 is used in SMOV for the IR grism calibration), so that the calibration is not based on a single target. An additional calibration target also minimizes the potential for problems from other nearby sources in the field.
The original flux monitor observed GD71 and GD153 at a range of detector positions but was reduced to a single orbit of GD153 based on the stability of the initial calibration. Using a longer time baseline, a decrease in sensitivity of ~0.1% per year has been measured, so GRW+70 was added (and GD71 resumed) to more accurately track these time-dependent losses.HIP-66578J2000J = 13.25STARG V-IVNOThis object was generated by the target selector and retrieved from the SIMBAD database.
SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM.J2000J2000The scheduling data was generated by CASM 33.1.CASM was run in Phase II mode.Visit targetting GD1531768178969000281.522693210101(Tic-Visit
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