! File: 5116C.PROP ! Database: PEPDB ! Date: 23-FEB-1994:21:16:01 coverpage: title_1: SATURN SATELLITE SEARCH (WC17): title_2: CYCLE 4 AND FUTURE-CYCLE CONTINUATION sci_cat: SOLAR SYSTEM proposal_for: GTO/WFC pi_title: PROF. pi_fname: JAMES pi_mi: A. pi_lname: WESTPHAL pi_inst: CALTECH pi_country: USA pi_phone: (818) 395-4900 keywords_1: SATURN, SATELLITES, JANUS, EPIMETHEUS, TELESTO, keywords_2: CALYPSO, ATLAS hours_pri: 1.55 num_pri: 1 wf_pc: Y pi_position: PROFESSOR OF PLANETA ! end of coverpage abstract: line_1: The purpose of these observations is to determine the positions of satellites line_2: that cannot be observed from the ground (coorbital and shepherding satellites), line_3: and that have been indicated by Voyager but not confirmed (satellites in the line_4: orbits of the coorbitals, Mimas, Tethys, and Dione), and to do a completeness line_5: survey for satellites in the Saturnian system down to 22nd magnitude between line_6: the A ring and Dione. In 1995-6 the Earth will pass through line_7: the plane of Saturn's ring and thus provide an optimum time for line_8: observing the satellites and the inner limits of the E-ring. ! ! end of abstract general_form_proposers: lname: WESTPHAL fname: JAMES mi: A. inst: CALTECH country: USA ! ! end of general_form_proposers block general_form_text: question: 2 section: 1 line_1: The Saturnian system with the rings and many satellites, some sharing orbits in line_2: librational motions, is the most complex example of planetary development line_3: currently known. There are indications from Voyager observations that the line_4: system may be even more complex. The detection of additional satellites may line_5: help explain the complex ring structure and may also reveal more complex line_6: satellite motions than currently known. line_8: Observations of the coorbitals, which can only be observed from the ground when line_9: the Earth is in the ring plane of Saturn, will provide data for determining the line_10: masses of the satellites, as well as their librational period and motions. line_12: Observations will be made to determine the positions of satellites that cannot line_13: be observed from the ground, specifically the coorbitals and shepherding line_14: satellites. Also the purpose is to image satellites that have been indicated line_15: by the Voyager spacecraft, specifically additional satellites in the orbits of line_16: the coorbitals, Mimas, Tethys and Dione, and to detect additional satellites line_17: between the A ring and the orbit of Dione. ! question: 3 section: 1 line_1: The telescope should be pointed so that Saturn and the A ring are located line_2: diagonally in one chip of the Wide Field camera with the edge of the ring close line_3: to the central point of the chip. A series of three exposures are taken with line_4: this configuration. Then Saturn and the rings are shifted to the diagonally line_5: opposite chip of the camera, so the opposite edge of the A ring is close to the line_6: central point of the chip and the exposure sequence is repeated. Then this line_7: pair of pointings is repeated two more times. line_9: Observations to be taken in May and Aug 1995 and Feb 1996. ! question: 5 section: 1 line_1: The observations need to be scheduled when the coorbital satellites are at line_2: eastern or western elongation and when the Earth is in the line_3: ring plan of Saturn (May 22, 1995, Aug 11, 1995, and Feb 12, 1996). Opposition line_4: dates for Saturn are Sep 1, 1994, Sep 14, 1995 and Sep 26, 1996. ! question: 13 section: 1 line_1: The purpose of these observations is to determine the positions of satellites line_2: that cannot be observed from the ground (coorbital and shepherding satellites), line_3: and that have been indicated by Voyager but not observed (satellites in the line_4: orbits of the coorbitals, Mimas, Tethys, and Dione), and to do a completeness line_5: survey for satellites in the Saturnian system down to 22nd magnitude between line_6: the A ring and Dione. Also, by observing when the Earth is line_7: passing through the ring plane the inner limits of the E-ring may be observed. ! !end of general form text general_form_address: lname: WESTPHAL fname: JAMES mi: A. title: PROF. category: PI inst: CALTECH addr_1: M/S 170-25 addr_2: DIVISION OF GEOLOGICAL addr_3: & PLANETARY SCIENCES city: PASADENA state: CA zip: 91125 country: USA phone: 818-395-4900 ! lname: SEIDELMANN fname: P. mi: K. category: CON inst: US NAVAL OBSERVATORY addr_1: ORBITAL MECHANICS DEPARTMENT city: WASHINGTON state: DC zip: 20390 country: USA phone: 202-653-1545 ! lname: FABER fname: SANDRA mi: M. category: CON inst: UC SANTA CRUZ - LICK OBSERVATORY addr_1: NATURAL SCIENCE II, BLDG. 160 city: SANTA CRUZ state: CA country: USA phone: 408-459-2944 ! ! end of general_form_address records ! No fixed target records found solar_system_targets: targnum: 1 name_1: SATURN descr_1: OTHER SATELLITE SEARCH lev1_1: STD = SATURN ! ! end of solar system targets ! No generic target records found exposure_logsheet: linenum: 1.000 sequence_1: DEFINE sequence_2: SATSAT targname: # config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F606W num_exp: 1 time_per_exp: 1S priority: # param_1: CR-SPLIT=NO, param_2: CLOCKS=YES req_1: SEQ 1-2 NO GAP; comment_1: CYCLE 4-5 VERSION; comment_2: 6/4/93 KAS/RML ! linenum: 2.000 sequence_1: DEFINE sequence_2: SATSAT targname: # config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F606W num_exp: 1 time_per_exp: 20S priority: # param_1: CR-SPLIT=NO, param_2: CLOCKS=YES ! linenum: 4.000 sequence_1: USE sequence_2: SATSAT targname: SATURN priority: 1 req_2: ORIENT 54D +/- 1D; req_3: SEQ 4-5 NO GAP; req_4: SEQ 4-9 WITHIN 300M; req_5: CYCLE 5 / 4-9 comment_1: POS TARGS TBD; ORIGINAL comment_2: REQUESTED POS TARG TOLERANCE comment_3: +/- 0.5"(X), +/- 0.1" (Y) comment_4: FOR LINES 4-9. ! linenum: 5.000 sequence_1: USE sequence_2: SATSAT targname: SATURN priority: 1 req_1: POS TARG 0,-31; req_2: ORIENT 49.3D +/- 1D; ! linenum: 6.000 sequence_1: USE sequence_2: SATSAT targname: SATURN priority: 1 req_1: POS TARG 20,11; req_2: SAME ORIENT FOR 6 AS 4; req_3: SEQ 6-7 NO GAP; req_4: AFTER 4 BY 96M +/- 10M; ! linenum: 7.000 sequence_1: USE sequence_2: SATSAT targname: SATURN priority: 1 req_1: POS TARG 0,-31; req_2: SAME ORIENT FOR 7 AS 5; ! linenum: 8.000 sequence_1: USE sequence_2: SATSAT targname: SATURN priority: 1 req_1: POS TARG 20,11; req_2: SAME ORIENT FOR 8 AS 4; req_3: SEQ 8-9 NO GAP; req_4: AFTER 4 BY 192M +/- 10M; ! linenum: 9.000 sequence_1: USE sequence_2: SATSAT targname: SATURN priority: 1 req_1: POS TARG 0,-31; req_2: SAME ORIENT FOR 9 AS 5; ! ! end of exposure logsheet ! No scan data records found