6324( 2) - 07/21/95 08:22 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6324 Version: 2 Check-in Date: ********** 1.Proposal Title: PARALLAX OF GEMINGA ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle HOT STARS,NEUTRON STA GO/DD 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Giovanni Bignami Istituto per Richerche in Fisica CoI: Patrizia Caraveo Istituto per Richerche in Fisica Y CoI: Laurence Taff JHU N ------------------------------------------------------------------------------------ 6. Abstract The object orignally known as G" was proposed as the optical counterpart of the source Geminga on the basis of its colour peculiarities. The discovery of its proper motion strongly supported such identification by giving to it the characteristics of a neutron star. Fixing the distance to Geminga by measuring the annual parallax of its optical counterpart became a real possibility only at the HST refurbishing mission. ------------------------------------------------------------------------------------ Observations Description ------------------------ Director's Discretionary Program to obtain 3 additional orbits of data on Geminga. WFPC2 images will be taken in the F555W filter. Observations are best obtained at equinox so preferred date is 21 September. Have included time window of 18 to 24 September to be more flexible. An orient is also specified to ensure data are obtained at the same orient as those taken last September in 5751 -- SU 01. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 6324( 2) - 07/21/95 08:22 - [ 2] Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 6324( 2) - 07/21/95 08:22 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 STAR- STAR,PULSAR, RA=6H 33M 54.13S +/- 0.033S, J2000 E(B-V) = 15.0 E-2 0633+1746 DEC= 17D 46' 12.43" +/- 0.50", V = 25.3 +/- 0.2 PLATE-ID=001S B = 26.5 +/- 0.5 6324( 2) - 07/21/95 08:22 - [ 4] Visit: 01 Visit Requirements: BETWEEN 18-SEP-1995 AND 24-SEP-1995; ORIENT 272D TO 273D; On Hold Comments: Additional Comments: Prefer 21 September at equinox scheduling. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 STAR- WFPC2 IMAGE PC1 F555W CR- 1 1400S 0633+1746 TOLERANCE=0.0 ------------------------------------------------------------------------------------------------------------------------------------ 20 STAR- WFPC2 IMAGE PC1 F555W CR- 1 1600S 0633+1746 TOLERANCE=0.0 ------------------------------------------------------------------------------------------------------------------------------------ 30 STAR- WFPC2 IMAGE PC1 F555W CR- 1 1600S 0633+1746 TOLERANCE=0.0 ------------------------------------------------------------------------------------------------------------------------------------ 40 STAR- WFPC2 IMAGE PC1 F675W CR-SPLIT=NO 3 800S 0633+1746 ------------------------------------------------------------------------------------------------------------------------------------ 6324( 2) - 07/21/95 08:22 - [ 5] Summary Form for Proposal 6324 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-TOLERANCE=0.0 CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO/DD ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category HOT STARS,NEUTRON STARS ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 18-SEP-1995 AND 24-SEP-1995; ORIENT 272D TO 273D; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F555W F675W ------------------------------------------------------------------------------------------------------------------------------------ Target Names STAR-0633+1746 ------------------------------------------------------------------------------------------------------------------------------------