! File: 3744C.PROP ! Database: PEPDB ! Date: 19-FEB-1994:18:06:24 coverpage: title_1: SPECTROPHOTOMETRY OF PHOBOS AND DEIMOS sci_cat: SOLAR SYSTEM sci_subcat: SATELLITES proposal_for: GO cont_id: 2435 pi_fname: BENJAMIN pi_mi: H. pi_lname: ZELLNER pi_inst: COMPUTER SCIENCES CORPORATION pi_country: USA pi_phone: 301-338-4729 hours_pri: 0.92 num_pri: 9 fos: Y time_crit: Y funds_amount: 23778 off_fname: ROSELLE off_lname: HARDE off_title: SR. CONTRACTS ADMIN. off_inst: COMPUTER SCIENCES CORPORATION off_addr_1: SYSTEM SCIENCES DIVISION off_addr_2: 4061 POWDER MILL ROAD off_city: CALVERTON off_state: MD off_zip: 20705 off_country: USA off_phone: (301) 572-3637 ! end of coverpage abstract: line_1: The satellites of Mars have been studied by the Mariner 9, Viking, line_2: and Phobos 2 missions. They are small, dark, and irregularly shaped, line_3: and have often been described as analogues of C-type mainbelt asteroids line_4: and some carbonaceous chondrites. Being the only such objects closely line_5: inspected by rendezvous spacecraft, they provide benchmarks for line_6: comparison of disk-integrated with disk-resolved objects, and thus line_7: thus are vital in interpretation of astronomical data for many solar line_8: system objects. Also Phobos and Deimos have substantially different line_9: surface features, and promise substantial interpretive benefit by line_10: their variety. line_12: However groundbased observations that would allow direct comparisons line_13: with the asteroids are very difficult to obtain, and recent observa- line_14: tions call into serious question the analogy with both carbonaceous line_15: chondrites and C-type asteroids. Also the connection with meteorites line_16: is poorly established because of severe limitations of available line_17: reflectance data obtained from rendezvous spacecraft. Thus we propose line_18: HST spectrophotometry of both satellites and three comparison line_19: asteroids. ! ! end of abstract general_form_proposers: lname: ZELLNER fname: BENJAMIN title: PI mi: H. inst: COMPUTER SCIENCES CORPORATION country: USA ! lname: WELLS fname: EDDIE mi: N. inst: COMPUTER SCIENCES CORPORATION country: USA ! lname: THOMAS fname: P. inst: CORNELL UNIVERSITY country: USA ! lname: VEVERKA fname: J. inst: CORNELL UNIVERSITY country: USA ! lname: BELL fname: J. inst: HAWAII, UNIVERSITY OF country: USA ! lname: THOLEN fname: D. inst: HAWAII, UNIVERSITY OF country: USA ! lname: GRADIE fname: J. inst: HAWAII, UNIVERSITY OF country: USA ! lname: CALDWELL fname: J. inst: YORK UNIVERSITY country: CANADA ! lname: PANG fname: K. inst: JET PROPULSION LABORATORY country: USA ! lname: FINK fname: U. inst: ARIZONA, UNIVERSITY OF country: USA ! lname: GRUNDY fname: W. inst: ARIZONA, UNIVERSITY OF country: USA ! ! end of general_form_proposers block general_form_text: question: 3 section: 1 line_1: We propose to obtain one FOS spectrum of line_2: Phobos near either eastern or western elongation, line_3: and one for each elongation of Deimos, plus a sky line_4: background exposure for each target exposure. The line_5: sky background is expected to be quite small but line_6: must be measured. The sky region should be taken line_7: about 3 arcseconds north or south of the satellite line_8: while the telescope continues to track at the rate line_9: of the satellite. line_11: For comparison we propose spectra of one D-type line_12: asteroid, either 1144 Oda or 773 Irmintraud, and line_13: one C-type asteroid, either 111 Ate or 702 Alauda. line_14: (A couple of P-types were originally included in line_15: this proposal but are no longer listed.) line_17: All exposures will use the FOS with the Red Digicon line_18: and prism and the 1-arcsecond aperture. With exposure line_19: times of around 400 seconds for Phobos and Deimos, we line_20: can achieve a SNR of at least 30 over the 2800-7500 A line_21: range. Multiple readout/clears of the data during the line_22: exposures will be required to permit accumulation of line_23: sufficient UV photons without saturating the ! question: 3 section: 2 line_1: long-wavelength signal. Binary onboard acquisitions line_2: in the 4.3-arcsec aperture will be used in all cases. line_4: Also we request an exposure of a G2V standard star line_5: for calibration to the solar spectrum. Since the line_6: standard star is somewhat too bright, the binary line_7: acquisition will instead be made on a nearby line_8: 17th-magnitude field star. ! question: 5 section: 1 line_1: The opposition of Mars will occur in early 1993. line_2: To avoid complications of phase reddening in the line_3: interpretations, both satellites should be observed line_4: at solar phase angles not exceeding 18 degrees, line_5: i.e., within a few weeks after 17 December 1992. line_6: Both an east and a west elongation of Deimos is line_7: requested to see each hemisphere of this variegated object. line_9: Similarly the comparison asteroids should be observed line_10: at less than 18 degrees phase. For the D-types, line_11: 1144 Oda comes to opposition on 12 Sept 1992, and line_12: 773 Irmintraud on 21 April 1993. For the C-types, line_13: 111 Ate is at opposition on 13 Nov 1992, and line_14: 702 Alauda on 16 Jan 1993. line_16: The solar-type star can be observed at any time line_17: during the above time-frame. In case the spectral line_18: sensitivity of the FOS/Red should change with time, line_19: however, the star would best be done near the line_20: mid-point of the above observations, line_21: e.g., in November or December of 1992. line_23: No real-time data or interactions are required. ! question: 6 section: 1 line_1: Obtaining an instrumental solar spectrum for calculation of the line_2: spectral reflectance is not a trivial matter. The expected line_3: spectral features are weak and shallow, the solar UV spectrum is line_4: choppy, and the spectral resolution of the FOS with prism varies line_5: sharply with wavelength. We expect that the standard HST-supplied line_6: calibration will be adequate only for a first-order analysis. We line_7: propose instead to rely primarily on relative calibration via an line_8: identical FOS observation of solar-type star BD+16D601 = SAO93936. line_9: The instrumental spectra of both satellites and the two asteroids line_10: will all be divided by that of the solar-type star, and then line_11: compared with each other. ! !end of general form text general_form_address: lname: ZELLNER fname: BENJAMIN mi: H. category: PI inst: COMPUTER SCIENCES CORPORATION addr_1: SPACE TELESCOPE SCIENCE INSTITUTE city: BALTIMORE state: MD zip: 21218 country: USA phone: 301-338-4729 ! ! end of general_form_address records fixed_targets: targnum: 10 name_1: BD+16D601 name_2: HYA VB64 name_3: SAO93936 descr_1: A,137 pos_1: RA= 4H 26M 40.003S +/- 0.001S, pos_2: DEC= +16D 44' 49.21" +/- 0.01" equinox: 2000 pm_or_par: Y pos_epoch_bj: J pos_epoch_yr: 1982.00 ra_pm_val: 0.007100 ra_pm_unct: 0.000467 dec_pm_val: -0.0230 dec_pm_unct: 0.0090 fluxnum_1: 1 fluxval_1: V=8.073 +/- 0.004, TYPE=G0 fluxnum_2: 2 fluxval_2: B-V=0.674 ! targnum: 11 name_1: BD+16D601-OFFSET descr_1: A pos_1: RA= 4H 26M 40.829S +/- 0.001S, pos_2: DEC= +16D 44' 13.93" +/- 0.01" equinox: 2000 pm_or_par: N pos_epoch_bj: J pos_epoch_yr: 1982.00 comment_1: FAINT STAR CLOSE TO BD+16D601 comment_2: USED FOR BINARY ACQUISITION. comment_3: MAGNITUDE APPROXIMATE; COLOR comment_4: INTERMEDIATE. COORDINATES FROM comment_5: GSSS. fluxnum_1: 1 fluxval_1: V=17.0 ! ! end of fixed targets solar_system_targets: targnum: 1 name_1: PHOBOS descr_1: SATELLITE PHOBOS lev1_1: STD=MARS lev2_1: STD=PHOBOS wind_1: SEP OF EARTH SUN FROM MARS LT 18 D, wind_2: SEP OF PHOBOS MARS FROM EARTH GT wind_3: 10" comment_1: PHOBOS NEAR ELONGATION, comment_2: SOLAR PHASE ANGLE LT 18 DEG. comment_3: SATELLITE GT 10 ARCSEC FROM LIMB. comment_4: FLUXNUM_2 IS FOR SKY, A WILD comment_5: GUESS. fluxnum_1: 1 fluxval_1: V=12.6 fluxnum_2: 2 fluxval_2: V=14.2 ! targnum: 2 name_1: DEIMOS-E descr_1: SATELLITE DEIMOS lev1_1: STD=MARS lev2_1: STD=DEIMOS wind_1: SEP OF EARTH SUN FROM MARS LT 18 D, wind_2: SEP OF DEIMOS MARS FROM EARTH GT 20 ", wind_3: OLG OF DEIMOS FROM EARTH BETWEEN 45 135 comment_1: DEIMOS NEAR EAST ELONGATION, comment_2: SOLAR PHASE ANGLE LT 18 DEG. comment_3: SATELLITE GT 10 ARCSEC FROM LIMB. comment_4: FLUXNUM_2 IS FOR SKY, A WILD comment_5: GUESS. fluxnum_1: 1 fluxval_1: V=13.6 fluxnum_2: 2 fluxval_2: V=16.0 ! targnum: 3 name_1: DEIMOS-W descr_1: SATELLITE DEIMOS lev1_1: STD=MARS lev2_1: STD=DEIMOS wind_1: SEP OF EARTH SUN FROM MARS LT 18 D, wind_2: SEP OF DEIMOS MARS FROM EARTH GT 20 ", wind_3: OLG OF DEIMOS FROM EARTH BETWEEN wind_4: 225 315 comment_1: DEIMOS NEAR WEST ELONGATION, comment_2: SOLAR PHASE ANGLE LT 18 DEG. comment_3: SATELLITE GT 10 ARCSEC FROM LIMB fluxnum_1: 1 fluxval_1: V=13.6 fluxnum_2: 2 fluxval_2: V=16.0 ! targnum: 4 name_1: 1144-ODA descr_1: ASTEROID 1144 ODA lev1_1: STD=1144(ODA) wind_1: SEP OF EARTH SUN FROM 1144 LT 18 D comment_1: ASTEROID 1144 ODA; comment_2: SOLAR PHASE ANGLE LT 18 DEG.; comment_3: FIRST-CHOICE D-TYPE ASTEROID; comment_4: OPPOSITION 12 SEP 1992; comment_5: FLUX1 AT OPPOSITION; FLUX2 comment_6: AT 18 DEG. fluxnum_1: 1 fluxval_1: V=14.85 fluxnum_2: 2 fluxval_2: V=15.69 ! targnum: 5 name_1: 773-IRMINTRAUD descr_1: ASTEROID 773 IRMINTRAUD lev1_1: STD=773(IRMINTRAUD) wind_1: SEP OF EARTH SUN FROM 773 LT 18 D comment_1: ASTEROID 773 IRMINTRAUD; comment_2: SOLAR PHASE ANGLE LT 18 DEG.; comment_3: ALTERNATE D-TYPE ASTEROID; comment_4: OPPOSITION 21 APRIL 1993; comment_5: FLUX1 IS AT OPPOSITION, FLUX2 comment_6: AT 18 DEG. fluxnum_1: 1 fluxval_1: V=13.30 fluxnum_2: 2 fluxval_2: V=14.14 ! targnum: 8 name_1: 111-ATE descr_1: ASTEROID 111-ATE lev1_1: STD=111(ATE) wind_1: SEP OF EARTH SUN FROM 111 LT 18 D comment_1: ASTEROID 111 ATE; comment_2: SOLAR PHASE ANGLE LT 18 DEG.; comment_3: FIRST-CHOICE C-TYPE ASTEROID; comment_4: OPPOSITION 13-NOV 1992; comment_5: FLUX1 IS AT OPPOSITION; FLUX2 comment_6: IS AT 18 DEG. fluxnum_1: 1 fluxval_1: V=11.10 fluxnum_2: 2 fluxval_2: V=11.94 ! targnum: 9 name_1: 702-ALAUDA descr_1: ASTEROID 702-ALAUDA lev1_1: STD=702(ALAUDA) wind_1: SEP OF EARTH SUN FROM 702 LT 18 D comment_1: ASTEROID 702 ALAUDA; comment_2: SOLAR PHASE ANGLE LT 18 DEG.; comment_3: ALTERNATE C-TYPE ASTEROID; comment_4: OPPOSITION 16-JAN 1993; comment_5: FLUX1 IS AT OPPOSITION; FLUX2 comment_6: IS AT 18 DEG. fluxnum_1: 1 fluxval_1: V=11.80 fluxnum_2: 2 fluxval_2: V=12.64 ! ! end of solar system targets ! No generic target records found exposure_logsheet: linenum: 1.000 targname: PHOBOS config: FOS/RD opmode: ACQ/BINARY aperture: 4.3 sp_element: MIRROR num_exp: 1 time_per_exp: 0.75 S fluxnum_1: 1 priority: 1 req_1: ONBOARD ACQ FOR 2-3; req_2: CYCLE 2 / 1-15; req_3: REQ UPLINK comment_1: MODE II ACQUISITION OF PHOBOS ! linenum: 2.000 targname: PHOBOS config: FOS/RD opmode: RAPID aperture: 1.0 sp_element: PRISM wavelength: 1850-8950 num_exp: 1 time_per_exp: 400 S fluxnum_1: 1 priority: 1 param_1: READ-TIME=40, param_2: SUB-STEP=2 req_1: SEQ 2-3 NON-INT comment_1: MEASUREMENT OF PHOBOS ! linenum: 3.000 targname: PHOBOS config: FOS/RD opmode: IMAGE aperture: 1.0 sp_element: PRISM wavelength: 1850-8950 num_exp: 1 time_per_exp: 30 S fluxnum_1: 2 priority: 1 param_1: SUB-STEP=2, param_2: COMB=YES, param_3: Y-SIZE=1 req_1: POS TARG 0.0, 3.0 comment_1: SKY MEAS FOR PHOBOS. comment_2: DELTA-X = 0.0 ARCSEC AND comment_3: DELTA-Y = 3.0 ARCSEC FROM comment_4: CURRENT POSITION OF PHOBOS. comment_5: SATELLITE NOT IN APERTURE. comment_6: CONTINUE TRACKING SATELLITE. ! linenum: 4.000 targname: DEIMOS-E config: FOS/RD opmode: ACQ/BINARY aperture: 4.3 sp_element: MIRROR num_exp: 1 time_per_exp: 4.0 S fluxnum_1: 1 priority: 1 req_1: ONBOARD ACQ FOR 5-6; req_2: REQ UPLINK comment_1: MODE II ACQUISITION OF comment_2: DEIMOS EAST OF MARS. ! linenum: 5.000 targname: DEIMOS-E config: FOS/RD opmode: RAPID aperture: 1.0 sp_element: PRISM wavelength: 1850-8950 num_exp: 1 time_per_exp: 600 S fluxnum_1: 1 priority: 1 param_1: READ-TIME=40, param_2: SUB-STEP=2 req_1: SEQ 5-6 NON-INT comment_1: MEASUREMENT OF DEIMOS comment_2: NEAR EASTERN ELONGATION. ! linenum: 6.000 targname: DEIMOS-E config: FOS/RD opmode: IMAGE aperture: 1.0 sp_element: PRISM wavelength: 1850-8950 num_exp: 1 time_per_exp: 30 S fluxnum_1: 2 priority: 1 param_1: SUB-STEP=2, param_2: COMB=YES, param_3: Y-SIZE=1 req_1: POS TARG 0.0, +3.0 comment_1: SKY MEAS FOR DEIMOS-E. comment_2: DELTA-X = 0.0 ARCSEC AND comment_3: DELTA-Y = +3.0 ARCSEC FROM comment_4: CURRENT POSITION OF DEIMOS. comment_5: SATELLITE NOT IN APERTURE. comment_6: CONTINUE TRACKING SATELLITE. ! linenum: 7.000 targname: DEIMOS-W config: FOS/RD opmode: ACQ/BINARY aperture: 4.3 sp_element: MIRROR num_exp: 1 time_per_exp: 4.0 S fluxnum_1: 1 priority: 1 req_1: ONBOARD ACQ FOR 8-9; req_2: REQ UPLINK comment_1: MODE II ACQUISITION FOR comment_2: DEIMOS WEST OF MARS. ! linenum: 8.000 targname: DEIMOS-W config: FOS/RD opmode: RAPID aperture: 1.0 sp_element: PRISM wavelength: 1850-8950 num_exp: 1 time_per_exp: 600 S fluxnum_1: 1 priority: 1 param_1: READ-TIME=40, param_2: SUB-STEP=2 req_1: SEQ 8-9 NON-INT comment_1: MEASUREMENT OF DEIMOS comment_2: WEST OF MARS. ! linenum: 9.000 targname: DEIMOS-W config: FOS/RD opmode: IMAGE aperture: 1.0 sp_element: PRISM wavelength: 1850-8950 num_exp: 1 time_per_exp: 30 S fluxnum_1: 2 priority: 1 param_1: SUB-STEP=2, param_2: COMB=YES, param_3: Y-SIZE=1 req_1: POS TARG 0.0, +3.0 comment_1: SKY MEAS FOR DEIMOS-W. comment_2: DELTA-X = 0.0 ARCSEC AND comment_3: DELTA-Y = +3.0 ARCSEC FROM comment_4: CURRENT POSITION OF DEIMOS. comment_5: SATELLITE NOT IN APERTURE. comment_6: CONTINUE TRACKING SATELLITE. ! linenum: 10.000 targname: 1144-ODA config: FOS/RD opmode: ACQ/BINARY aperture: 4.3 sp_element: MIRROR num_exp: 1 time_per_exp: 13.0 S fluxnum_1: 1 priority: 2 req_1: ONBOARD ACQ FOR 11; req_2: SELECT 1 OF 10-11 OR 11.25-11.5; req_3: REQ UPLINK comment_1: MODE II ACQUISITION FOR ASTEROID comment_2: 1144 ODA. ! linenum: 11.000 targname: 1144-ODA config: FOS/RD opmode: RAPID aperture: 1.0 sp_element: PRISM wavelength: 1850-8950 num_exp: 1 time_per_exp: 720 S fluxnum_1: 1 priority: 2 param_1: SUB-STEP=2, param_2: READ-TIME=40 comment_1: FIRST-CHOICE D-TYPE ASTEROID. comment_2: USE ASTEROID 773 INSTEAD IF 1144 comment_3: CANNOT BE SCHEDULED. ! linenum: 11.250 targname: 773-IRMINTRAUD config: FOS/RD opmode: ACQ/BINARY aperture: 4.3 sp_element: MIRROR num_exp: 1 time_per_exp: 3.1 S fluxnum_1: 1 priority: 2 req_1: ONBOARD ACQ FOR 11.5; req_2: REQ UPLINK comment_1: MODE II ACQUISITION FOR ASTEROID comment_2: 773-IRMINTRAUD. ! linenum: 11.500 targname: 773-IRMINTRAUD config: FOS/RD opmode: RAPID aperture: 1.0 sp_element: PRISM wavelength: 1850-8950 num_exp: 1 time_per_exp: 720 S fluxnum_1: 1 priority: 2 param_1: SUB-STEP=2, param_2: READ-TIME=40 comment_1: ALTERNATE D-TYPE ASTEROID. comment_2: USE ONLY IF 1144 CANNOT comment_3: CANNOT BE SCHEDULED. ! linenum: 12.000 targname: 111-ATE config: FOS/RD opmode: ACQ/BINARY aperture: 4.3 sp_element: MIRROR num_exp: 1 time_per_exp: 0.66 S fluxnum_1: 1 priority: 2 param_1: BRIGHT=53000, param_2: FAINT=1060 req_1: ONBOARD ACQ FOR 13; req_2: REQ UPLINK comment_1: MODE II ACQUISITION FOR ASTEROID comment_2: 111 ATE. ! linenum: 13.000 targname: 111-ATE config: FOS/RD opmode: RAPID aperture: 1.0 sp_element: PRISM wavelength: 1850-8950 num_exp: 1 time_per_exp: 240 S fluxnum_1: 1 priority: 2 param_1: SUB-STEP=2, param_2: READ-TIME=20 req_1: SELECT 1 OF 12-13 OR 13.25-13.75 comment_1: FIRST-CHOICE C-TYPE ASTEROID. comment_2: USE ASTEROID 702 INSTEAD IF 111 CANNOT comment_3: BE SCHEDULED. ! linenum: 13.250 targname: 702-ALAUDA config: FOS/RD opmode: ACQ/BINARY aperture: 4.3 sp_element: MIRROR num_exp: 1 time_per_exp: 0.78 S fluxnum_1: 1 priority: 2 req_1: ONBOARD ACQ FOR 13.75; req_2: REQ UPLINK comment_1: MODE II ACQUISITION FOR ASTEROID comment_2: 702-ALAUDA. ! linenum: 13.750 targname: 702-ALAUDA config: FOS/RD opmode: RAPID aperture: 1.0 sp_element: PRISM wavelength: 1850-8950 num_exp: 1 time_per_exp: 400 S fluxnum_1: 1 priority: 2 param_1: SUB-STEP=2, param_2: READ-TIME=40 comment_1: ALTERNATE C-TYPE ASTEROID. comment_2: USE ONLY IF 111 CANNOT comment_3: BE SCHEDULED. ! linenum: 14.000 targname: BD+16D601-OFFSET config: FOS/RD opmode: ACQ/BINARY aperture: 4.3 sp_element: MIRROR num_exp: 1 time_per_exp: 25.9 S fluxnum_1: 1 priority: 1 req_1: ONBOARD ACQ FOR 15; comment_1: REFERENCE STAR FOR ONBOARD ACQ comment_2: FOR SOLAR-TYPE STAR BD+16D601 ! linenum: 15.000 targname: BD+16D601 config: FOS/RD opmode: RAPID aperture: 1.0 sp_element: PRISM wavelength: 1850-8950 num_exp: 1 time_per_exp: 30 S fluxnum_1: 1 priority: 1 param_1: READ-TIME=1.0, param_2: SUB-STEP=2 comment_1: SOLAR-TYPE STAR FOR CALIBRATION comment_2: OF SATELLITES OF MARS. comment_3: DON'T FORGET SLEW FROM ACQUISITION comment_4: STAR TO TARGET ! ! end of exposure logsheet ! No scan data records found