! File: 4764C.PROP ! Database: PEPDB ! Date: 23-FEB-1994:02:16:03 coverpage: title_1: INVESTIGATION OF THE DYNAMICS OF BINARY ASTEROIDS sci_cat: SOLAR SYSTEM sci_subcat: MINOR PLANET proposal_for: GO pi_title: MR. pi_fname: BENJAMIN pi_mi: P. pi_lname: WEISS pi_inst: AMHERST COLLEGE pi_country: USA pi_phone: (413) 542-3152 keywords_1: ASTEROIDS, BINARY, MINOR PLANET hours_pri: 3.00 num_pri: 6 wf_pc: Y time_crit: Y ! end of coverpage abstract: line_1: In 1929, Bobrovnikoff stated that, "If an occasional asteroid were not line_2: a single body but consisted of several pieces [...] we could never tell line_3: the difference." We propose the study of possible binary asteroid pairs: line_4: 18 Melpomene, 216 Kleopatra, 532 Herculina, 146 Lucina, 624 Hektor, line_5: and 192 Nausikaa. We have found that the parameters of mean separation line_6: and throughput of these pairs to be within the observational constraints line_7: of the WF/PC Hubble Space Telescope Instrument. Using HST we hope to line_8: assess the validity of Bobrovnikoff's statement and thereby further our line_9: understanding of binary asteroids and the dynamics of the main belt line_10: region. ! ! end of abstract general_form_proposers: lname: WEISS fname: BENJAMIN title: PI mi: P. inst: AMHERST COLLEGE country: USA ! ! end of general_form_proposers block general_form_text: question: 2 section: 1 line_1: Through the aid of the Hubble Space Telescope's exceptional resolution line_2: capacity, we hope to determine the true configuration of binary asteroids. line_3: The outcome of our observations may explain the nature of some asteroids' line_4: unusual lightcurves by demonstrating the existence and nature of binary line_5: asteroids. From an extensive list of suspected binaries, obtained from line_6: the works of W.K. Hartmann, Dunham(1979), Weidenschilling et al., and line_7: Tedesco (1979), we have chosen several asteroid pairs which could have line_8: effectively photographed by the HST. Our choice of study candidates was line_9: limited by the resolution of the telescope. line_10: Thus, we have chosen pairs which exhibit mean separations greater than line_11: the limitations of the Planetary Camera. All separationsexceed the .043 line_12: arcsec. limiting resolution of the PC. At about the center of the line_13: asteroid belt, this corresponds to a resolution of 69 km, far less than line_14: the calculated separations of our proposed pairs. With this and the line_15: 28 magnitude brightness constraint, we have selected 18 Melpomene, line_16: 146 Lucina, 216 Kleopatra, 532 Herculina, and 624 Hektor for our line_17: observation targets. As previously stated, the results of our line_18: observations may explain many asteroids' aberrant activities. In line_19: addition, our findings may determine the true dimensional model for line_20: binary pair interaction. Finally, the outcome of our observation may line_21: lend insight into the dynamics of the main belt consequently further line_22: our understanding of the structural composition of the solar system. ! question: 3 section: 1 line_1: Observations of the porposed binary asteroid targets are all best line_2: suited for the WF/PC instrument of the HST accompanied by the use of line_3: the f555W filter bandwidth. This configuration will enable resolution line_4: and throughput properties of the observations to be consistent with the line_5: capabilities with the HST. Our investigation requires that the small line_6: mean separation of the proposed binary asteroid pairs be resolvable for line_7: study of physical and dynamic structure and relationship. ! question: 4 section: 1 line_1: The observations for distinct pairs will require that each object is line_2: of appropriate magnitude for use with the PC. The limiting throughput line_3: of 28 mag is the lower limit on our selection of possible binary line_4: asteroids. All of our much more able to resolve a possible asteroid and line_5: satellite pair (since they will appear farther apart when they are line_6: closer to earth). Therefore, we ask that each of our targets be line_7: photographed at or near opposition. ! question: 6 section: 1 line_1: We plan to to do our initial data reduction and analysis at STScI. ! question: 9 section: 1 line_1: no ! question: 10 section: 1 line_1: Our institutions each have Sun SparcStation2's loaded with IRAF. It is line_2: not clear yet whether we will all be able to have accounts on all of line_3: as well as these. We also have access to the Amherst, Rice, and line_4: Dartmouth libraries, as well as libraries directly affiliated with line_5: these institutions. ! !end of general form text general_form_address: lname: Weiss fname: Benjamin mi: P title: Mr. category: PI inst: Amherst College addr_1: Box 1321, Amherst College, P.O. Box 5000 city: Amherst state: MA zip: 01002 country: USA phone: (413)542-3152 from_date: 01-SEP-92 to_date: 15-MAY-93 ! lname: Burleson fname: Winslow mi: S title: Mr. category: CON inst: Rice University addr_1: P.O. Box 2286 city: Houston state: TX zip: 77252 country: USA phone: (713)527-0438 from_date: 28-AUG-92 to_date: 01-MAY-93 ! lname: Sichitiu fname: Rukmini mi: M title: Miss category: CON inst: Dartmouth College addr_1: Dartmouth College, HB 4081 city: Hanover state: NH zip: 03755 country: USA phone: (301) 377-4361 ! ! end of general_form_address records ! No fixed target records found solar_system_targets: targnum: 1 name_1: 18-MELPOMENE descr_1: ASTEROID 18 lev1_1: STD=18(MELPOMENE) wind_1: WND1=1-JAN-93 TO 31-JAN-93 fluxnum_1: 1 fluxval_1: V=9.04 +/-.10 ! targnum: 2 name_1: 146-LUCINA descr_1: ASTEROID 146 lev1_1: STD=146(LUCINA) wind_1: WND1=1-NOV-93 TO 30-NOV-93 fluxnum_1: 1 fluxval_1: V=12.17 +/-.10 ! targnum: 3 name_1: 216-KLEOPATRA descr_1: ASTEROID 216 lev1_1: STD=216(KLEOPATRA) wind_1: WND1=1-JUN-93 TO 30-JUN-93 fluxnum_1: 1 fluxval_1: V=11.86 +/- .10 ! targnum: 4 name_1: 532-HERCULINA descr_1: ASTEROID 532 lev1_1: STD=532(HERCULINA) wind_1: WND1=15-AUG-93 TO 15-SEP-93 fluxnum_1: 1 fluxval_1: V=10.37 +/-.10 ! targnum: 5 name_1: 624-HEKTOR descr_1: ASTEROID 624 lev1_1: STD=624(HEKTOR) wind_1: WND1=1-JUN-93 TO 30-JUN-93 fluxnum_1: 1 fluxval_1: V=14.67+/-.10 ! ! end of solar system targets ! No generic target records found exposure_logsheet: linenum: 1.000 targname: 18-MELPOMENE config: PC opmode: IMAGE aperture: PC6 sp_element: F439W num_exp: 1 time_per_exp: 0.5S s_to_n: 10 priority: 1 param_1: PRE-FLASH=YES req_1: SEQ 1.0-1.3 NON-INT; req_2: CYCLE 2 / 1.0-5.3; req_3: PCS MODE C /1-5.3 comment_1: WILL EXECUTE ACCORDING TO THE WINDOW ! linenum: 1.100 targname: 18-MELPOMENE config: PC opmode: IMAGE aperture: PC6 sp_element: F439W num_exp: 1 time_per_exp: 0.5S s_to_n: 10 priority: 1 param_1: PRE-FLASH=YES req_1: POS TARG 0.022, 0.022 ! linenum: 1.200 targname: 18-MELPOMENE config: PC opmode: IMAGE aperture: PC6 sp_element: F439W num_exp: 1 time_per_exp: 2.0S s_to_n: 10 priority: 1 param_1: PRE-FLASH=YES ! linenum: 1.300 targname: 18-MELPOMENE config: PC opmode: IMAGE aperture: PC6 sp_element: F439W num_exp: 1 time_per_exp: 2.0S s_to_n: 10 priority: 1 param_1: PRE-FLASH=YES req_1: POS TARG 0.022, 0.022 ! linenum: 2.000 targname: 146-LUCINA config: PC opmode: IMAGE aperture: PC6 sp_element: F439W num_exp: 1 time_per_exp: 10S s_to_n: 10 priority: 1 param_1: PRE-FLASH=YES req_1: SEQ 2.0-2.3 NON-INT; comment_1: WILL EXECUTE ACCORDING TO THE WINDOW ! linenum: 2.100 targname: 146-LUCINA config: PC opmode: IMAGE aperture: PC6 sp_element: F439W num_exp: 1 time_per_exp: 10S s_to_n: 10 priority: 1 param_1: PRE-FLASH=YES req_1: POS TARG 0.022, 0.022 ! linenum: 2.200 targname: 146-LUCINA config: PC opmode: IMAGE aperture: PC6 sp_element: F555W num_exp: 1 time_per_exp: 4S s_to_n: 10 priority: 1 param_1: PRE-FLASH=YES ! linenum: 2.300 targname: 146-LUCINA config: PC opmode: IMAGE aperture: PC6 sp_element: F555W num_exp: 1 time_per_exp: 4S s_to_n: 10 priority: 1 param_1: PRE-FLASH=YES req_1: POS TARG 0.022, 0.022 ! linenum: 3.000 targname: 216-KLEOPATRA config: PC opmode: IMAGE aperture: PC6 sp_element: F439W num_exp: 1 time_per_exp: 7.0S s_to_n: 10 priority: 1 param_1: PRE-FLASH=YES req_1: SEQ 3.0-3.3 NON-INT; comment_1: WILL EXECUTE ACCORDING TO THE WINDOW ! linenum: 3.100 targname: 216-KLEOPATRA config: PC opmode: IMAGE aperture: PC6 sp_element: F439W num_exp: 1 time_per_exp: 7.0S s_to_n: 10 priority: 1 param_1: PRE-FLASH=YES req_1: POS TARG 0.022, 0.022 ! linenum: 3.200 targname: 216-KLEOPATRA config: PC opmode: IMAGE aperture: PC6 sp_element: F555W num_exp: 1 time_per_exp: 3.0S s_to_n: 10 priority: 1 param_1: PRE-FLASH=YES ! linenum: 3.300 targname: 216-KLEOPATRA config: PC opmode: IMAGE aperture: PC6 sp_element: F555W num_exp: 1 time_per_exp: 3.0S s_to_n: 10 priority: 1 param_1: PRE-FLASH=YES req_1: POS TARG 0.022, 0.022 ! linenum: 4.000 targname: 532-HERCULINA config: PC opmode: IMAGE aperture: PC6 sp_element: F439W num_exp: 1 time_per_exp: 1.8S s_to_n: 10 priority: 1 param_1: PRE-FLASH=YES req_1: SEQ 4.0-4.3 NON-INT; comment_1: WILL EXECUTE ACCORDING TO THE WINDOW ! linenum: 4.100 targname: 532-HERCULINA config: PC opmode: IMAGE aperture: PC6 sp_element: F439W num_exp: 1 time_per_exp: 1.8S s_to_n: 10 priority: 1 param_1: PRE-FLASH=YES req_1: POS TARG 0.022, 0.022 ! linenum: 4.200 targname: 532-HERCULINA config: PC opmode: IMAGE aperture: PC6 sp_element: F555W num_exp: 1 time_per_exp: 0.7S s_to_n: 10 priority: 1 param_1: PRE-FLASH=YES ! linenum: 4.300 targname: 532-HERCULINA config: PC opmode: IMAGE aperture: PC6 sp_element: F555W num_exp: 1 time_per_exp: 0.7S s_to_n: 10 priority: 1 param_1: PRE-FLASH=YES req_1: POS TARG 0.022, 0.022 ! linenum: 5.000 targname: 624-HEKTOR config: PC opmode: IMAGE aperture: PC6 sp_element: F439W num_exp: 1 time_per_exp: 100S s_to_n: 10 priority: 1 param_1: PRE-FLASH=YES req_1: SEQ 5.0-5.3 NON-INT; comment_1: WILL EXECUTE ACCORDING TO THE WINDOW ! linenum: 5.100 targname: 624-HEKTOR config: PC opmode: IMAGE aperture: PC6 sp_element: F439W num_exp: 1 time_per_exp: 100S s_to_n: 10 priority: 1 param_1: PRE-FLASH=YES req_1: POS TARG 0.022, 0.022 ! linenum: 5.200 targname: 624-HEKTOR config: PC opmode: IMAGE aperture: PC6 sp_element: F555W num_exp: 1 time_per_exp: 40S s_to_n: 10 priority: 1 param_1: PRE-FLASH=YES ! linenum: 5.300 targname: 624-HEKTOR config: PC opmode: IMAGE aperture: PC6 sp_element: F555W num_exp: 1 time_per_exp: 40S s_to_n: 10 priority: 1 param_1: PRE-FLASH=YES req_1: POS TARG 0.022, 0.022 ! ! end of exposure logsheet ! No scan data records found