10341( 7) - 05/17/04 14:21 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 10341 Version: 7 Check-in Date: 17-May-2004 18:17:44 1.Proposal Title: The D/H Ratio in C/2002 T7 (LINEAR) ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle 4. Parallel Pointing Tolerance GO/DD 12 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Dr. Harold A. Weaver The Johns Hopkins University Applied Physics Laboratory CoI: Dr. Michael R. Combi University of Michigan N CoI: Dr. Michel C. Festou Observatoire Midi-Pyrenees N CoI: Dr. Paul D. Feldman The Johns Hopkins University N CoI: Prof. Claude Arpigny Universite de Liege N CoI: Dr. Michael F. A'Hearn University of Maryland N CoI: Dr. Gian Paolo Tozzi Osservatorio Astrofisico di Arcetri N ------------------------------------------------------------------------------------ 6. Abstract Measuring the D/H ratio in comets is one of the most important scientific objectives in planetary science. A comparison of the D/H ratio in comets to the value measured in the Earth's oceans can be used to assess whether cometary impacts contributed significantly to the delivery of water and other volatiles to the Earth. A comparison of the cometary ratio with the value in other solar system reservoirs (e.g., in the solar wind and the atmospheres of the Giant Planets), and to values observed in the interstellar medium, can be used to determine how primitive cometary matter is. Our recent detection of the deuterium Lyman-alpha line in C/2001 Q4 (NEAT) demonstrates that HST has a new and potentially important role to play in this exciting area of research. Fortuitously, another moderately bright comet, C/2002 T7 (LINEAR), is well-placed for HST observations in early June, and we request 8 orbits of HST time to measure deuterium in this comet. If our observations are successful, the number of comets for which D/H has been measured will be nearly doubled. ------------------------------------------------------------------------------------ 10341( 7) - 05/17/04 14:21 - [ 2] Observations Description ------------------------ See the phase 1 submission. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 10341( 7) - 05/17/04 14:21 - [ 3] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 1 | TARGET NAME: LINEAR-2002T7 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: COMET LINEAR-2002T7 ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | TYPE=COMET,Q=0.6146012966508876,E=1.0005 | 18914314327,I=160.5835486311661,O=94.859 | 55637750945,W=157.7374511774273,T = 23- | Apr- | 2004:01:28:53.0,EQUINOX=J2000,EPOCH=24- | May-2004 | | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | ------------------------------------------------------------------------------------------------------------------------------------ DATA | COMMENTS | V = 15.0+/-1.0 | | Ephemeris Uncertainty: 5800.0 KM | ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 2 | TARGET NAME: LINEAR-2002T7-OFF ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: COMET LINEAR-2002T7-OFF ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | TYPE=COMET,Q=0.6146012966508876,E=1.0005 | TYPE=POS_ANGLE,RAD=700.0,ANG=0.0,REF=SUN 18914314327,I=160.5835486311661,O=94.859 | 55637750945,W=157.7374511774273,T = 23- | Apr- | 2004:01:28:53.0,EQUINOX=J2000,EPOCH=24- | May-2004 | | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | ------------------------------------------------------------------------------------------------------------------------------------ DATA | COMMENTS | V = 15.0+/-1.0 | | Ephemeris Uncertainty: 5800.0 KM | ------------------------------------------------------------------------------------------------------------------------------------ 10341( 7) - 05/17/04 14:21 - [ 4] Visit: 01 Visit Priority: Visit Requirements: PCS MODE FINE; SCHED 100% On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 LINEAR-2002 STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=POINT 1 10 S REQ EPHEM CORR LIN1 T7 ------------------------------------------------------------------------------------------------------------------------------------ 2 LINEAR-2002 STIS/FUV TIME-TA 6X0.2 E140H 1234 BUFFER-TIME=300 1 1800 S REQ EPHEM CORR LIN1 T7 -MAMA G ------------------------------------------------------------------------------------------------------------------------------------ 10341( 7) - 05/17/04 14:21 - [ 5] Visit: 02 Visit Priority: Visit Requirements: PCS MODE FINE On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 LINEAR-2002 STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=POINT 1 10 S REQ EPHEM CORR LIN2; GS T7 ACQ SCENARIO SINGLE ------------------------------------------------------------------------------------------------------------------------------------ 2 LINEAR-2002 STIS/FUV TIME-TA 6X0.2 E140H 1234 BUFFER-TIME=300 1 1800 S REQ EPHEM CORR LIN2 T7 -MAMA G ------------------------------------------------------------------------------------------------------------------------------------ 10341( 7) - 05/17/04 14:21 - [ 6] Visit: 03 Visit Priority: Visit Requirements: PCS MODE FINE On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 LINEAR-2002 STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=POINT 1 10 S REQ EPHEM CORR LIN3 T7 ------------------------------------------------------------------------------------------------------------------------------------ 2 LINEAR-2002 STIS/FUV TIME-TA 6X0.2 E140H 1234 BUFFER-TIME=300 1 1800 S REQ EPHEM CORR LIN3 T7 -MAMA G ------------------------------------------------------------------------------------------------------------------------------------ 10341( 7) - 05/17/04 14:21 - [ 7] Visit: 04 Visit Priority: Visit Requirements: PCS MODE FINE On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 LINEAR-2002 STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=POINT 1 10 S REQ EPHEM CORR LIN4; GS T7 ACQ SCENARIO SINGLE ------------------------------------------------------------------------------------------------------------------------------------ 2 LINEAR-2002 STIS/FUV TIME-TA 6X0.2 E140H 1234 BUFFER-TIME=300 1 1800 S REQ EPHEM CORR LIN4 T7 -MAMA G ------------------------------------------------------------------------------------------------------------------------------------ 10341( 7) - 05/17/04 14:21 - [ 8] Visit: 05 Visit Priority: Visit Requirements: PCS MODE FINE On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 LINEAR-2002 STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=POINT 1 10 S REQ EPHEM CORR LIN5 T7 ------------------------------------------------------------------------------------------------------------------------------------ 2 LINEAR-2002 STIS/FUV TIME-TA 6X0.2 E140H 1234 BUFFER-TIME=300 1 1800 S REQ EPHEM CORR LIN5 T7 -MAMA G ------------------------------------------------------------------------------------------------------------------------------------ 10341( 7) - 05/17/04 14:21 - [ 9] Visit: 06 Visit Priority: Visit Requirements: PCS MODE FINE On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 LINEAR-2002 STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=POINT 1 10 S REQ EPHEM CORR LIN6 T7 ------------------------------------------------------------------------------------------------------------------------------------ 2 LINEAR-2002 STIS/FUV TIME-TA 6X0.2 E140H 1234 BUFFER-TIME=300 1 1800 S REQ EPHEM CORR LIN6 T7 -MAMA G ------------------------------------------------------------------------------------------------------------------------------------ 10341( 7) - 05/17/04 14:21 - [ 10] Visit: 07 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 LINEAR-2002 STIS/FUV TIME-TA 6X0.2 E140H 1234 BUFFER-TIME=300 1 1800 S REQ EPHEM CORR LIN7; GS T7-OFF -MAMA G ACQ SCENARIO SINGLE ------------------------------------------------------------------------------------------------------------------------------------ 10341( 7) - 05/17/04 14:21 - [ 11] Visit: 08 Visit Priority: Visit Requirements: SCHED 100% On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 LINEAR-2002 STIS/CCD ACQ F28X50LP MIRROR 1 10 S REQ EPHEM CORR LIN8; GS T7 ACQ SCENARIO SINGLE ------------------------------------------------------------------------------------------------------------------------------------ 2 LINEAR-2002 STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=300 1 1800 S REQ EPHEM CORR LIN8 T7 -MAMA G ------------------------------------------------------------------------------------------------------------------------------------ 10341( 7) - 05/17/04 14:21 - [ 12] Summary Form for Proposal 10341 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures F28X50LP 6X0.2 52X0.2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD STIS/FUV-MAMA STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ACQTYPE=POINT BUFFER-TIME=300 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO/DD ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PCS MODE FINE; SCHED 100% REQ EPHEM CORR LIN1 PCS MODE FINE REQ EPHEM CORR LIN2; GS ACQ SCENARIO SINGLE REQ EPHEM CORR LIN2 REQ EPHEM CORR LIN3 REQ EPHEM CORR LIN4; GS ACQ SCENARIO SINGLE REQ EPHEM CORR LIN4 REQ EPHEM CORR LIN5 REQ EPHEM CORR LIN6 REQ EPHEM CORR LIN7; GS ACQ SCENARIO SINGLE SCHED 100% REQ EPHEM CORR LIN8; GS ACQ SCENARIO SINGLE REQ EPHEM CORR LIN8 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR E140H G230L ------------------------------------------------------------------------------------------------------------------------------------ Target Names LINEAR-2002T7 LINEAR-2002T7-OFF ------------------------------------------------------------------------------------------------------------------------------------ Wavelengths 1234 2376 ------------------------------------------------------------------------------------------------------------------------------------