8446( 2) - 04/22/99 15:47 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 8446 Version: 2 Check-in Date: 22-Apr-1999 15:17:28 1.Proposal Title: WFPC2 Cycle 8 Astrometric Monitor ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle CAL/WF2 8 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: Stefano Casertano Space Telescope Science Institute ------------------------------------------------------------------------------------ 5. Abstract This program will verify relative positions of WFPC2 chips with respect to one another. ------------------------------------------------------------------------------------ Observations Description ------------------------ The rich star field in Omega Centauri (same position as cycle 7 proposal 7627) will be observed with large shifts (35") in F555W only, at two different times during cycle 8. This will indicate whether there are shifts in the relative positions of the chips or changes in the astrometric solution at the sub-pixel level. Kelsall spot images will be taken in conjunction with each execution. The K-spots data and some external data indicate that shifts of up to 1 pixel may have occurred since mid-1994. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- Fraction of GO/GTO Programs Supported is 20%. Also supports WFPC2-assisted target acquisitions for other instruments 2 pointed orbits and 2 occultation periods needed for this program, each separated 6 months apart. Products: TIPS reports, update of chip positions in PDB and of geometric solution in STSDAS tasks metric and wmosaic if significant changes are found. ------------------------------------------------------------------------------------ 8446( 2) - 04/22/99 15:47 - [ 2] Data Distribution Paper Products: NO Media: ELECTRONIC Blocking Factor: 10 Ship To: PI_Address Ship Via: Email: ------------------------------------------------------------------------------------ 8446( 2) - 04/22/99 15:47 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 OMEGA-CEN STELLAR CLUSTER, RA=13H 27M 11.83S +/- 0.1S, DEC= 2000 V = 21 GLOBULAR CLUSTER -47D 29' 54.7" +/- 1", PLATE- ID=ZZZR 8446( 2) - 04/22/99 15:47 - [ 4] Visit: 01 Visit Priority: Visit Requirements: BETWEEN 15-JUN-1999 AND 15-SEP-1999 On Hold Comments: Additional Comments: If there are scheduling problems, please contact S. Gonzaga ASAP at x4412. Please check guide star availability in advance for both visits. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 OMEGA-CEN WFPC2 IMAGE WFALL F555W 1 100 S POS TARG 0, 0 ------------------------------------------------------------------------------------------------------------------------------------ 3 OMEGA-CEN WFPC2 IMAGE WFALL F555W 1 100 S POS TARG 35, 35 ------------------------------------------------------------------------------------------------------------------------------------ 4 OMEGA-CEN WFPC2 IMAGE WFALL F555W 1 100 S POS TARG 35.25, 35.25 ------------------------------------------------------------------------------------------------------------------------------------ 5 OMEGA-CEN WFPC2 IMAGE WFALL F555W 1 100 S POS TARG 35, -35 ------------------------------------------------------------------------------------------------------------------------------------ 7 OMEGA-CEN WFPC2 IMAGE WFALL F555W 1 100 S POS TARG -35, -35 ------------------------------------------------------------------------------------------------------------------------------------ 8 OMEGA-CEN WFPC2 IMAGE WFALL F555W 1 100 S POS TARG -35.25, -35.25 ------------------------------------------------------------------------------------------------------------------------------------ 9 OMEGA-CEN WFPC2 IMAGE WFALL F555W 1 100 S POS TARG -35, 35 ------------------------------------------------------------------------------------------------------------------------------------ 11 KSPOTS WFPC2 IMAGE WFALL DEF ATD-GAIN=15 1 1 S ------------------------------------------------------------------------------------------------------------------------------------ 12 KSPOTS WFPC2 IMAGE WFALL DEF ATD-GAIN=15 1 2.6 S SEQ 11-12 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 8446( 2) - 04/22/99 15:47 - [ 5] Visit: 02 Visit Priority: Visit Requirements: BETWEEN 15-FEB-2000 AND 15-APR-2000 On Hold Comments: Additional Comments: If there are scheduling problems, please contact S. Gonzaga ASAP at x4412. After visit 1 by about 6 months. Please check guide star availability in advance for both visits. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 OMEGA-CEN WFPC2 IMAGE WFALL F555W 1 100 S POS TARG 0, 0 ------------------------------------------------------------------------------------------------------------------------------------ 3 OMEGA-CEN WFPC2 IMAGE WFALL F555W 1 100 S POS TARG 35, 35 ------------------------------------------------------------------------------------------------------------------------------------ 4 OMEGA-CEN WFPC2 IMAGE WFALL F555W 1 100 S POS TARG 35.25, 35.25 ------------------------------------------------------------------------------------------------------------------------------------ 5 OMEGA-CEN WFPC2 IMAGE WFALL F555W 1 100 S POS TARG 35, -35 ------------------------------------------------------------------------------------------------------------------------------------ 7 OMEGA-CEN WFPC2 IMAGE WFALL F555W 1 100 S POS TARG -35, -35 ------------------------------------------------------------------------------------------------------------------------------------ 8 OMEGA-CEN WFPC2 IMAGE WFALL F555W 1 100 S POS TARG -35.25, -35.25 ------------------------------------------------------------------------------------------------------------------------------------ 9 OMEGA-CEN WFPC2 IMAGE WFALL F555W 1 100 S POS TARG -35, 35 ------------------------------------------------------------------------------------------------------------------------------------ 11 KSPOTS WFPC2 IMAGE WFALL DEF ATD-GAIN=15 1 1 S ------------------------------------------------------------------------------------------------------------------------------------ 12 KSPOTS WFPC2 IMAGE WFALL DEF ATD-GAIN=15 1 2.6 S SEQ 11-12 NON-INT Comments: DO KSPOTS BACK-TO-BACK ------------------------------------------------------------------------------------------------------------------------------------ 8446( 2) - 04/22/99 15:47 - [ 6] Summary Form for Proposal 8446 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFALL ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category CAL/WF2 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 15-JUN-1999 AND 15-SEP-1999 POS TARG 0, 0 POS TARG 35, 35 POS TARG 35.25, 35.25 POS TARG 35, -35 POS TARG -35, -35 POS TARG -35.25, -35.25 POS TARG -35, 35 SEQ 11-12 NON-INT BETWEEN 15-FEB-2000 AND 15-APR-2000 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F555W DEF ------------------------------------------------------------------------------------------------------------------------------------ Target Names OMEGA-CEN KSPOTS ------------------------------------------------------------------------------------------------------------------------------------