Separate lightcurves of Pluto and Charon

被引:89
作者
Buie, MW [1 ]
Tholen, DJ [1 ]
Wasserman, LH [1 ]
机构
[1] UNIV HAWAII,INST ASTRON,HONOLULU,HI 96822
基金
美国国家航空航天局;
关键词
D O I
10.1006/icar.1996.5624
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present new Hubble Space Telescope observations of the Pluto-Charon system taken with WFPC1 (PC6) between 1992 May 21 and 1993 August 18. Our observations consist of 52 images with the F555W filter and 8 images in the F439W filter. From these data we extracted individual lightcurves, phase coefficients, and colors for Pluto and Charon. These lightcurves have peak-to-peak variations of 0.33 and 0.08 mag, respectively. The lightcurve for Charon is consistent with its suspected synchronous rotation about Pluto. The linear phase coefficients are 0.0294 +/- 0.0011 mag/deg for Pluto and 0.0866 +/- 0.0078 mag/deg for Charon, spanning a range of phase angles from 0.6 degrees to 2.0 degrees. Charon's lightcurve has far less structure than Pluto's with minimum light corresponding to the anti-Pluto hemisphere. We found the B-V color of Charon to be 0.710 +/- 0.011 mag. Combined with previous mutual event measurements, the color of Charon is seen to be globally uniform. We also confirmed a reddish B-V color for Pluto of 0.873 +/- 0.002 and 0.862 +/- 0.002 mag at 123 degrees and 289 degrees east longitude, respectively, These colors are consistent with prior mutual event observations but the higher precision measurement indicates that the surface of Pluto is slightly redder near minimum light. (C) 1997 Academic Press.
引用
收藏
页码:233 / 244
页数:12
相关论文
共 28 条
  • [1] PHOTOMETRY OF PLUTO DURING THE 1983 OPPOSITION - A NEW DETERMINATION OF THE PHASE COEFFICIENT
    BINZEL, RP
    MULHOLLAND, JD
    [J]. ASTRONOMICAL JOURNAL, 1984, 89 (11) : 1759 - 1761
  • [2] BINZEL RP, 1988, SCIENCE, V241
  • [3] PHYSICAL OBSERVATIONS OF (5145) PHOLUS
    BUIE, MW
    BUS, SJ
    [J]. ICARUS, 1992, 100 (02) : 288 - 294
  • [4] ALBEDO MAPS OF PLUTO AND CHARON - INITIAL MUTUAL EVENT RESULTS
    BUIE, MW
    THOLEN, DJ
    HORNE, K
    [J]. ICARUS, 1992, 97 (02) : 211 - 227
  • [5] BUIE MW, 1994, EOS, V75, P216
  • [6] PHOTOMETRY OF SATURNS SATELLITES - OPPOSITION EFFECT OF LAPETUS AT MAXIMUM LIGHT AND VARIABILITY OF TITAN
    FRANKLIN, FA
    COOK, AF
    [J]. ICARUS, 1974, 23 (03) : 355 - 362
  • [7] PHOTOMETRY OF DIONE, TETHYS, AND ENCELADUS ON UBV SYSTEM
    FRANZ, OG
    MILLIS, RL
    [J]. ICARUS, 1975, 24 (04) : 433 - 442
  • [8] ROTATION PROPERTIES OF 4 L5 TROJAN ASTEROIDS FROM CCD PHOTOMETRY
    FRENCH, LM
    [J]. ICARUS, 1987, 72 (02) : 325 - 341
  • [9] V-PHOTOMETRY OF TITANIA, OBERON, AND TRITON
    GOGUEN, JD
    HAMMEL, HB
    BROWN, RH
    [J]. ICARUS, 1989, 77 (02) : 239 - 247
  • [10] PHASE-RELATIONS OF HIGH ALBEDO ASTEROIDS - THE UNUSUAL OPPOSITION BRIGHTENING OF 44-NYSA AND 64-ANGELINA
    HARRIS, AW
    YOUNG, JW
    CONTREIRAS, L
    DOCKWEILER, T
    BELKORA, L
    SALO, H
    HARRIS, WD
    BOWELL, E
    POUTANEN, M
    BINZEL, RP
    THOLEN, DJ
    WANG, SC
    [J]. ICARUS, 1989, 81 (02) : 365 - 374