9991( 8) - 10/31/03 11:49 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 9991 Version: 8 Check-in Date: 31-Oct-2003 11:48:23 1.Proposal Title: The Orbit of a Newly Discovered Transneptunian Binary ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO/DD 12 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: Dr. Keith S. Noll Space Telescope Science Institute CoI: Dr. Denise Stephens Space Telescope Science Institute N CoI: Dr. Ian P. Griffin Space Telescope Science Institute N CoI: Dr. William M. Grundy Lowell Observatory N ------------------------------------------------------------------------------------ 5. Abstract We have recently discovered a binary companion to the transneptunian object (TNO) 1999 RZ253. We are requesting rapid followup observations during cycle 12 to make observations sufficient for a preliminary characterization of the orbital period, semimajor axis, eccentricity, and inclination. In particular, it is urgent to determine if this object is a candidate for observable mutual events in the near future, a possibility that would greatly add to its scientific interest. The study of TNBs is in a stage of explosive growth, fueled in large part by the capabilities of HST that we seek to exploit. ------------------------------------------------------------------------------------ Observations Description ------------------------ ACS HRC observations of a moving target, 1999 RZ_253. Each of four visits is a single orbit that consists of a pair of exposures in the g filter and a pair in the i filter. Sched 100 should be used to maximize scheduling flexibility. Real Time Justification ----------------------- none Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 9991( 8) - 10/31/03 11:49 - [ 2] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 1 | TARGET NAME: KBO1999RZ253 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: ASTEROID KBO ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | TYPE=ASTEROID,A=43.581970061,E=0.0868003 | 1,I=0.561647,O=84.3867244,W=194.6525467, | M=44.7964537,EPOCH=30-Jun- | 2003,EQUINOX=J2000 | | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | ------------------------------------------------------------------------------------------------------------------------------------ DATA | COMMENTS | V = 22.6+/-0.4 | | ------------------------------------------------------------------------------------------------------------------------------------ 9991( 8) - 10/31/03 11:49 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-HRC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.198 Coordinate_Frame POS-TARG Pattern_Orient 44.28 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 9991( 8) - 10/31/03 11:49 - [ 4] Visit: 10 Visit Priority: Visit Requirements: PCS MODE FINE SCHED 100% On Hold Comments: Additional Comments: First visit: Target is visible until January 01, 2004, then again starting in April 2004. In order to get the best sampling, we would like to have the first visit execute before the end of August. The second visit should execute 25 to 50 days after that, though it could be longer if needed. The last two visits will be on hold until we get the first two. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 KBO1999RZ25 ACS/HR ACCUM HRC F475W GAIN=2,CR-SPLIT=NO,SIZEAXIS2=FULL 1 600 S PATTERN 1 1-2 3 C Comments: can reduce to 500 sec if need be... ------------------------------------------------------------------------------------------------------------------------------------ 2 KBO1999RZ25 ACS/HR ACCUM HRC F775W GAIN=2,CR-SPLIT=NO,SIZEAXIS2=FULL 1 500 S 3 C ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 10 1 1 none none none 1 tbd 10 1 2 none none none 1 tbd 10 2 1 none none none 1 tbd 10 2 2 none none none 1 tbd 9991( 8) - 10/31/03 11:49 - [ 5] Visit: 20 Visit Priority: Visit Requirements: PCS MODE FINE SCHED 100% AFTER 10 BY 25 D TO 50 D On Hold Comments: Additional Comments: Second visit: Should execute 25 to 50 days after visit 10. This could be extended beyond 50 days if necessary. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 KBO1999RZ25 ACS/HR ACCUM HRC F475W GAIN=2,CR-SPLIT=NO,SIZEAXIS2=FULL 1 600 S PATTERN 1 1-2 3 C Comments: can reduce to 500 s if need be ------------------------------------------------------------------------------------------------------------------------------------ 2 KBO1999RZ25 ACS/HR ACCUM HRC F775W GAIN=2,CR-SPLIT=NO,SIZEAXIS2=FULL 1 500 S 3 C ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 20 1 1 none none none 1 tbd 20 1 2 none none none 1 tbd 20 2 1 none none none 1 tbd 20 2 2 none none none 1 tbd 9991( 8) - 10/31/03 11:49 - [ 6] Visit: 30 Visit Priority: Visit Requirements: PCS MODE FINE SCHED 100% On Hold Comments: Additional Comments: Third visit Execute as soon as possible Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 KBO1999RZ25 ACS/HR ACCUM HRC F475W GAIN=2,CR-SPLIT=NO 1 600 S PATTERN 1 1-2 3 C Comments: can reduce to 500 s if need be ------------------------------------------------------------------------------------------------------------------------------------ 2 KBO1999RZ25 ACS/HR ACCUM HRC F775W GAIN=2,CR-SPLIT=NO 1 500 S 3 C ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 30 1 1 none none none 1 tbd 30 1 2 none none none 1 tbd 30 2 1 none none none 1 tbd 30 2 2 none none none 1 tbd 9991( 8) - 10/31/03 11:49 - [ 7] Visit: 40 Visit Priority: Visit Requirements: PCS MODE FINE SCHED 100% AFTER 30 BY 9 D TO 15 D On Hold Comments: Additional Comments: Fourth visit Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 KBO1999RZ25 ACS/HR ACCUM HRC F475W GAIN=2,CR-SPLIT=NO 1 600 S PATTERN 1 1-2 3 C Comments: can reduce to 500 s if need be ------------------------------------------------------------------------------------------------------------------------------------ 2 KBO1999RZ25 ACS/HR ACCUM HRC F775W GAIN=2,CR-SPLIT=NO 1 500 S 3 C ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 40 1 1 none none none 1 tbd 40 1 2 none none none 1 tbd 40 2 1 none none none 1 tbd 40 2 2 none none none 1 tbd 9991( 8) - 10/31/03 11:49 - [ 8] Summary Form for Proposal 9991 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures HRC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/HRC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters GAIN=2 CR-SPLIT=NO SIZEAXIS2=FULL ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO/DD ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PCS MODE FINE SCHED 100% PATTERN 1 1-2 PCS MODE FINE SCHED 100% AFTER 10 BY 25 D TO 50 D PCS MODE FINE SCHED 100% AFTER 30 BY 9 D TO 15 D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F475W F775W ------------------------------------------------------------------------------------------------------------------------------------ Target Names KBO1999RZ253 ------------------------------------------------------------------------------------------------------------------------------------