Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 5640 Report Date: 18-Jul-95:17:47 Version: ********** Check-in Date: ********** 1.Proposal Title: CYCLE 4 DD HST OBSERVATIONS OF COMET SHOEMAKER-LEVY (1993E) FOR MAY 1994 ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID SOLAR SYSTEM GO/DD Sub Category COMETS ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Harold A. Weaver STSCI USA ------------------------------------------------------------------------------------ 7. Abstract Comet Shoemaker-Levy (1993e) is a comet that has recently broken up into many fragments, apparently somewhere in the vicinity of Jupiter. Ground-based observations reveal a string of sub-nuclei spaced over a distance of about one arcminute. HST observations of this object with the WFPC-2 should reveal a fascinating spatial morphology that is more detailed than any images obtained from ground-based telescopes. Most importantly, WFPC-2 images of 1993e should allow us to refine the nuclear size estimates that were originally estimated from WFPC-1 HST observations in July 1993. This proposal is for the May 1994 observations. ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 3.5 par: 0 10. Num targs pri: 1 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: WF/PC ------------------------------------------------------------------------------------ 12. Special sched req: Time Critical obs. ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 5640 PI: Harold A. Weaver Proposal Title: CYCLE 4 DD HST OBSERVATIONS OF COMET SHOEMAKER-LEVY (1993E) FOR MAY 1994 ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ Pi Harold A. Weaver STSCI USA ------------------------------------------------------------------------------------ 3. Description of proposed observations. The program consists of three visits to the comet (one orbit per visit) and one visit to Jupiter (one orbit.) In principle, GS Handoffs could be used for the three comet observations, but I don't think I want to take the risk of trying to use that new capability for these observations. If possible, please schedule all four orbits consecutively in the order given below. Certainly I want all the observations completed within one day. If the CML constraint on the Jupiter observations presents scheduling difficulties, then simply drop this constraint. I put this constraint in to capture the the part of Jupiter where most of the large impacts occur. Similarly, I'm fairly flexible on the ROLL constraint. I just don't want nominal roll for the comet observations because then the train will lie nearly along a column in WF4. SU 01: orbit 1: Two 800 sec WF3-4 images of SL-17 (E) SU 02: orbit 2: Two 800 sec WF3-4 images of SL-11 (L) SU 03: orbit 3: Two 800 sec WF3-4 images of SL-5 (S) SU 04: orbit 4: Many WF3 images of Jupiter ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. HST observations of Comet Shoemaker-Levy (1993e) should provide better detail on the break-up of this object than is available from any other source. ------------------------------------------------------------------------------------ 5. Description of special scheduling requirements. Please try to execute these observations during the week of 5/16 (sms 136) if possible, or during the week of 5/23 (sms 143) at the latest. I won't build this timing into the proposal itself but will instead leave it to the MT Group to check this requirement. ------------------------------------------------------------------------------------ 8. Additional comments or special requests. Page 3 ------------------------------------------------------------------------------------ 9. Description of previous HST work. ID no. 3064: HST Observations of Comet Levy (1990c) (A'Hearn, Arpigny, and Feldman are Co-Is), an imaging-only program that is only peripherally related to the current program. ID no. 2481: HST Observations of Periodic Comets (A'Hearn, Arpigny, and Feldman are Co-Is), only peripherally related to this program. ID no. 2483: The Volatile Composition of New Comets (A'Hearn, Arpigny, and Feldman are Co-Is), only peripherally related to this program. ID no. 2442: Cometary Parent Molecules, P.D. Feldman, PI (A'Hearn and Weaver are Co-Is), only peripherally related to this program. Cycle 2 program: ID no. 3707: HST Observations of Periodic Comets (A'Hearn, Arpigny, and Feldman are Co-Is), only peripherally related to this program. ID no. 3064: Two sets of WFC images of comet Levy were obtained 6.5 hours apart on 27 September 1990 in order to investigate its temporal variability. An arc of large grains was observed propagating sunward with a projected velocity of 0.16 km/sec. ID no. 2481: P/Hartley 2 was successfully observed in late 9/91 These observations produced the first detection of CO Cameron bands in comets. This emission is essentially a unique tracer of the CO2 abundance in comets. Additionally we obtained a beautiful spectrum of the comet covering the entire spectral range 1200-6800 A, from which we are compiling (still in progress) an inventory of volatiles in that comet. ID no. 2483: Comet Shoemaker-Levy (1991a1) was successfully observed in July 1992. Unfortunately, the comet was not as bright as we had hoped, but we obtained data of comparable (slightly higher) quality to that already in hand from P/Hartley 2. We definitely detected the CO Cameron bands again, but it is much too early to say anything more at this time. ID no. 2442: Comet Shoemaker- Levy (1991a1) was successfully observed in July 1992, but it is too early to say anything more at this time. ID no. 3064: Inner Coma Imaging of Comet Levy (1990c) with the Hubble Space Telescope, H. A. Weaver, M. F. A'Hearn, P. D. Feldman, C. Arpigny, W. A. Baum, J. C. Brandt, R. M. Light and J. A. Westphal,Icarus}, v. 97, p. 85, 1992. ID no. 2481: Probing the Nature of Comets with HST, H. A. Weaver and P. D. Feldman, in "Science with the Hubble Space Telescope", ESA-NASA CP, in press. Presentations on both the above programs have been made at several scientific meetings, including the annual DPS meetings in 1990 (for 3064), 1991 (for 2481), and 1992 (2481 and 2483). A paper on our detection of CO Cameron band emission in P/Hartley 2 will be submitted to a refereed journal shortly. ------------------------------------------------------------------------------------ 10. Resources to be supplied by investigator's institution(s). The STScI has excellent data-analysis capabilities and also maintains a pool of Science Data Analysts (SDAs) that are available to its staff. ------------------------------------------------------------------------------------ 11. Address Information Name: Harold A Weaver Category: PI Institution: 3470 Address: 3700 San Martin Drive City: Baltimore State: MD Zip Code: 21218 Country: USA Telephone: 410-338-5004 Telex (or e-mail): ------------------------------------------------------------------------------------ Page 4 Name: Harold A. Weaver Category: PI Institution: STScI Address: 3700 San Martin Drive Baltimore, MD 21218 USA City: Baltimore State: MD Zip Code: 21218 Country: USA Telephone: 410-516-8619 Telex (or e-mail): ------------------------------------------------------------------------------------ TARGET LIST b)Solar System Targets ID = 5640 [ 5] ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 1 | TARGET NAME: SL-17 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: COMET SHOEMAKER-LEVY 1993E-17 ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | FILE = SL-17, | ACQ = 3 | | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | ------------------------------------------------------------------------------------------------------------------------------------ REF | DATA | COMMENTS | | 1 |SURF(V) = 24 +/- 1 | THIS TARGET IS FOR ORBIT NUMBER 1 ON 2 |SIZE = 0.1 | 1993E. THE LETTER DESIGNATION IS E. | ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 2 | TARGET NAME: SL-11 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: COMET SHOEMAKER-LEVY 1993E-11 ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | FILE = SL-11, | ACQ = 3 | | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | ------------------------------------------------------------------------------------------------------------------------------------ REF | DATA | COMMENTS | | 1 |SURF(V) = 24 +/- 1 | THIS TARGET IS FOR ORBIT NUMBER 2 ON 2 |SIZE = 0.1 | 1993E. THE LETTER DESIGNATION IS L. | ------------------------------------------------------------------------------------------------------------------------------------ TARGET LIST b)Solar System Targets ID = 5640 [ 6] ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 3 | TARGET NAME: SL-5 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: COMET SHOEMAKER-LEVY 1993E-5 ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | FILE = SL-5, | ACQ = 3 | | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | ------------------------------------------------------------------------------------------------------------------------------------ REF | DATA | COMMENTS | | 1 |SURF(V) = 24 +/- 1 | THIS TARGET IS FOR ORBIT NUMBER 3 OF 2 |SIZE = 0.1 | 1993E. THE LETTER DESIGNATION IS S. | ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 4 | TARGET NAME: JUPITER ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: PLANET JUPITER ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | STD=JUPITER, | ACQ = 3 | | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | CML OF JUPITER FROM EARTH BETWEEN 0 80 | ------------------------------------------------------------------------------------------------------------------------------------ REF | DATA | COMMENTS | | 1 |SURF(V) = 5 +/- 1 | I WANT A CML OF ABOUT 40 DEG BECAUSE 2 |SIZE = 1 | THAT IS WHERE MOST OF THE LARGE | | IMPACTS WILL OCCUR. | ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 5640 [ 7] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1.1 SL-17 WFPC2 IMAGE WFALL- F702W CR-SPLIT=NO 1 800 S CYCLE 4 / 1.1-4.12 FIX READ=3+4 SEQ 1.1-3.2 NO GAP ORIENT +10D +/- 5D FROM NOMINAL POS TARG 0,-20 Comments: 1ST ORBIT, 1ST IMAGE FOR SL-17. ALL 1993E OBSERVATIONS SHOULD BE MADE AT THE SAME HST ROLL ANGLE. WE WOULD LIKE TO BE OFF NOMINAL ROLL BY ABOUT 10 DEG. ------------------------------------------------------------------------------------------------------------------------------------ 1.2 SL-17 WFPC2 IMAGE WFALL- F702W CR-SPLIT=NO 1 800 S SAME ORIENT FOR FIX READ=3+4 1.2-3.2 AS 1.1 POS TARG 0,-20 Comments: 1ST ORBIT, 2ND IMAGE FOR SL-17 ------------------------------------------------------------------------------------------------------------------------------------ 2.1 SL-11 WFPC2 IMAGE WFALL- F702W CR-SPLIT=NO 1 800 S POS TARG -20,-20 FIX READ=3+4 Comments: 2ND ORBIT, 1ST IMAGE FOR SL-11 ------------------------------------------------------------------------------------------------------------------------------------ 2.2 SL-11 WFPC2 IMAGE WFALL- F702W CR-SPLIT=NO 1 800 S POS TARG -20,-20 FIX READ=3+4 Comments: 2ND ORBIT, 2ND IMAGE FOR SL-11 ------------------------------------------------------------------------------------------------------------------------------------ 3.1 SL-5 WFPC2 IMAGE WFALL- F702W CR-SPLIT=NO 1 800 S POS TARG 0,-20 FIX READ=3+4 Comments: 3RD ORBIT, 1ST IMAGE FOR SL-5 ------------------------------------------------------------------------------------------------------------------------------------ 3.2 SL-5 WFPC2 IMAGE WFALL- F702W CR-SPLIT=NO 1 800 S POS TARG 0,-20 FIX READ=3+4 Comments: 3RD ORBIT, 2ND IMAGE FOR SL5 ------------------------------------------------------------------------------------------------------------------------------------ 4.01 JUPITER WFPC2 IMAGE WF3-FIX F673N CR-SPLIT=NO 1 0.5 S SEQ 4.01-4.12 NO READ=3 GAP Comments: RED OF RGB BEGIN JUPITER MAP (4TH ORBIT) ------------------------------------------------------------------------------------------------------------------------------------ 4.02 JUPITER WFPC2 IMAGE WF3-FIX F673N CR-SPLIT=NO 1 0.5 S SAME ORIENT FOR READ=3 4.02-4.12 AS 4.01 Comments: RED OF RGB ------------------------------------------------------------------------------------------------------------------------------------ 4.03 JUPITER WFPC2 IMAGE WF3-FIX F588N CR-SPLIT=NO 1 0.5 S READ=3 Comments: GREEN OF RGB ------------------------------------------------------------------------------------------------------------------------------------ 4.04 JUPITER WFPC2 IMAGE WF3-FIX F588N CR-SPLIT=NO 1 0.5 S READ=3 Comments: GREEN OF RGB ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 5640 [ 8] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 4.05 JUPITER WFPC2 IMAGE WF3-FIX F439W CR-SPLIT=NO 1 0.23 S READ=3 Comments: BLUE OF RGB ------------------------------------------------------------------------------------------------------------------------------------ 4.06 JUPITER WFPC2 IMAGE WF3-FIX F439W CR-SPLIT=NO 1 0.23 S READ=3 Comments: BLUE OF RGB ------------------------------------------------------------------------------------------------------------------------------------ 4.07 JUPITER WFPC2 IMAGE WF3-FIX F218W CR-SPLIT=NO 1 80 S READ=3 ------------------------------------------------------------------------------------------------------------------------------------ 4.08 JUPITER WFPC2 IMAGE WF3-FIX F255W CR-SPLIT=NO 1 30 S READ=3 ------------------------------------------------------------------------------------------------------------------------------------ 4.09 JUPITER WFPC2 IMAGE WF3-FIX F336W CR-SPLIT=NO 1 1 S READ=3 ------------------------------------------------------------------------------------------------------------------------------------ 4.11 JUPITER WFPC2 IMAGE WF3-FIX F410M CR-SPLIT=NO 1 1 S READ=3 ------------------------------------------------------------------------------------------------------------------------------------ 4.12 JUPITER WFPC2 IMAGE WF3-FIX F547M CR-SPLIT=NO 1 0.11 S READ=3 ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 5640 [ 9] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO READ=3+4 READ=3 ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GO/DD ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 3.5 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category SOLAR SYSTEM ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category COMETS ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements CYCLE 4 / 1.1-4.12; SEQ 1.1-3.2 NO GAP; ORIENT +10D +/- 5D FROM NOMINAL; POS TARG 0,-20 SAME ORIENT FOR 1.2-3.2 AS 1.1; POS TARG -20,-20 SEQ 4.01-4.12 NO GAP; SAME ORIENT FOR 4.02-4.12 AS 4.01; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F702W F673N F588N F439W F218W F255W F336W F410M F547M ------------------------------------------------------------------------------------------------------------------------------------ Target Names SL-17 SL-11 SL-5 JUPITER ------------------------------------------------------------------------------------------------------------------------------------