! File: 1135C.PROP ! Database: PEPDB ! Date: 16-FEB-1994:03:03:48 coverpage: title_1: NEPTUNE SATELLITE AND RING SEARCH (WF/PC-31): title_2: CYCLE 3 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) 356-4900 keywords_1: SATELLITES, NEPTUNE, RINGS hours_pri: 1.40 num_pri: 1 time_crit: X pi_position: PROFESSOR OF PLANETA ! end of coverpage abstract: line_1: There have been reports of the detection of a ring around Neptune and also of line_2: negative results. The Neptune satellite system is unusual with two satellites line_3: of very different types. These observations are designed for a search for line_4: rings and satellites around Neptune to a completeness limit of 23rd magnitude line_5: or fainter. The short exposures will provide reference positions. ! ! 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: Neptune has two very unusual satellites; a huge satellite (Triton) revolving in line_2: a retrograde direction and considerably out of the equatorial plane, and a line_3: small satellite much further away (20th mag., Nereid) moving in a direct orbit line_4: of high inclination and with an eccentricity twice that of any other satellite. line_5: This unusual configuration has led to the portrayal of the system as a line_6: "disrupted" one. Recently, occultation studies have indicated the presence of line_7: an incomplete or non-symmetric ring. The understanding of the ring or the line_8: discovery of other rings or new satellites of Neptune could add substantially line_9: to the understanding of the origin and evolution of this system. ! question: 3 section: 1 line_1: The Space Telescope should be pointed so that Neptune is just off the corner of line_2: the Wide Field camera field-of-view. A sequence of exposures is taken. Then line_3: the pointing is changed so that Neptune is just off another corner of the Wide line_4: Field camera field-of-view, and a sequence of exposures is taken. This line_5: procedure is continued to take a series of four pointings around Neptune and line_6: then another complete cycle of four pointings around Neptune is made. line_8: Observations to be made in Cycle 9. ! question: 5 section: 1 line_1: Observe near opposition (June 26, 1986, June 28, 1987, June 30, 1988). Need to line_2: accurately place Neptune off edge of field. See diagrams on exposure logsheet. ! question: 13 section: 1 line_1: A series of exposures will be made around Neptune with the F606W filter to line_2: attempt to obtain direct images of the ring or rings and to search for faint line_3: satellites. ! !end of general form text general_form_address: lname: SEIDELMANN fname: P. mi: K. category: CON inst: US NAVAL OBSERVATORY addr_1: NAUTICAL ALMANAC OFFICE city: WASHINGTON state: DC zip: 20390 country: USA phone: (202) 653-1545 ! lname: GUNN fname: JAMES mi: E. category: CON inst: PRINCETON UNIVERSITY addr_1: ASTROPHYSICAL SCIENCE addr_2: PEYTON HALL city: PRINCETON state: NJ zip: 08540 country: USA phone: (609) 452-3802 ! 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 zip: 95064 country: USA phone: (408) 429-2944 ! 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) 356-4900 ! ! end of general_form_address records ! No fixed target records found solar_system_targets: targnum: 1 name_1: NEPTUNE descr_1: RING NEPTUNE lev1_1: STD = NEPTUNE ! ! end of solar system targets ! No generic target records found exposure_logsheet: linenum: 1.000 sequence_1: DEFINE sequence_2: NEPSAT targname: # config: WFC opmode: IMAGE aperture: WFALL sp_element: F606W num_exp: 1 time_per_exp: 2S priority: # param_1: CR-SPLIT=NO, param_2: PRE-FLASH=YES, param_3: CLOCKS=YES req_1: NON-INT / 1-13; req_2: SEQ 1-2 NO GAP; comment_1: CYCLE 3-9 VERSION comment_2: JEG/RML 3/25/92 17:14. ! linenum: 2.000 sequence_1: ^ targname: ^ config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: ^ time_per_exp: 260S priority: ^ param_1: CR-SPLIT=NO, param_2: PRE-FLASH=YES, param_3: CLOCKS=YES, param_4: PURGE=YES ! linenum: 4.000 sequence_1: USE sequence_2: NEPSAT targname: NEPTUNE priority: 2 req_1: POS TARG 10.70,-9.3; req_2: SEQ 4-5 WITHIN 96M; req_3: SEQ 4-13 WITHIN 300M; req_4: CYCLE 4 / 4-13; req_5: COND IF TAC OK / 4-13; comment_1: TAKE AT OPPOSITION +/- 30D comment_2: REQUESTED TOLERANCE IN POS TARG: comment_3: 0.1"(X) AND 0.1"(Y) FOR 4-13 comment_4: YES, THE TARGET IS *OFF* THE FIELD. comment_5: WE ARE LOOKING FOR SATELLITES. comment_6: REQ: AT 12-JUL-1993 +/- 30D; ! linenum: 5.000 sequence_1: ^ targname: ^ priority: ^ req_1: POS TARG 9.30,-10.70; ! linenum: 8.000 sequence_1: ^ targname: ^ priority: ^ req_1: POS TARG 10.70,-9.3; req_2: SEQ 8-9 WITHIN 96M; req_3: AFTER 4 BY 96M +/- 10M; ! linenum: 9.000 sequence_1: ^ targname: ^ priority: ^ req_1: POS TARG 9.30,-10.70; ! linenum: 12.000 sequence_1: ^ targname: ^ priority: ^ req_1: POS TARG 10.70,-9.30; req_2: SEQ 12-13 WITHIN 96M; req_3: AFTER 4 BY 192M +/- 10M; ! linenum: 13.000 sequence_1: ^ targname: ^ priority: ^ req_1: POS TARG 9.30,-10.70; ! ! end of exposure logsheet ! No scan data records found