Titan: High-resolution speckle images from the Keck Telescope

被引:65
|
作者
Gibbard, SG [1 ]
Macintosh, B
Gavel, D
Max, CE
de Pater, I
Ghez, AM
Young, EF
McKay, CP
机构
[1] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA
[2] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA
[3] Univ Calif Los Angeles, Dept Phys, Los Angeles, CA 90095 USA
[4] SW Res Inst, Boulder, CO USA
[5] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA
关键词
Titan; infrared observations; surfaces; satellite;
D O I
10.1006/icar.1999.6095
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Saturn's large moon Titan is unique among planetary satellites in that it possesses a thick atmosphere and a haze layer that is opaque to visible light. This haze is believed to be composed of organic compounds produced by the photolysis of methane. It has been suggested that the photochemical products of methane photolysis, primarily ethane, would "rain out" over time and may produce reservoirs of liquid hydrocarbons on Titan's surface. Such material would appear very dark, with an albedo less than or equal to 0.02 (Khare et al. 1990, Bull. Am. Astron, Sec. 22, 1033). Such low-albedo regions have not been previously detected on Titan's surface. Here we report observations of Titan at a resolution of 0.04 arcsec (0.02 arcsec/pixel) using the technique of speckle imaging from the 10-m Keck I Telescope. By observing Titan at specific infrared wavelengths which are windows through its atmosphere, we have made both an albedo map of Titan's surface at 1.6 and 2.1 mu m and an estimate of Titan's haze optical depth at these wavelengths. We clearly distinguish low-albedo features (reflectance <0.05) on Titan's surface. (C) 1999 Academic Press.
引用
收藏
页码:189 / 201
页数:13
相关论文
共 50 条
  • [31] Produce high-resolution images
    不详
    BRITISH DENTAL JOURNAL, 2023, 235 (02) : 151 - 151
  • [32] High-resolution imaging of optical interferometric telescope
    Ding Yuanyuan
    Chen Xinyang
    Wang Chaoyan
    Wang Bei
    ELEVENTH INTERNATIONAL CONFERENCE ON INFORMATION OPTICS AND PHOTONICS (CIOP 2019), 2019, 11209
  • [33] HERMES: a high-resolution spectrograph for the Mercator Telescope
    Raskin, G
    Van Winckel, H
    Davignon, G
    GROUND-BASED INSTRUMENTATION FOR ASTRONOMY, PTS 1-3, 2004, 5492 : 322 - 330
  • [34] A high-resolution spectrograph for the Solar Telescope GREGOR
    Collados, Manuel
    Calcines, A.
    Diaz, J. J.
    Hernandez, E.
    Lopez, R.
    Paez, E.
    GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY II, PTS 1-4, 2008, 7014 : Z145 - Z145
  • [35] The high-resolution lightweight telescope for the EUV (HiLiTE)
    Martinez-Galarce, Dennis S.
    Boerner, Paul
    Soufli, Regina
    De Pontieu, Bart
    Katz, Noah
    Title, Alan
    Gullikson, Eric M.
    Robinson, Jeff C.
    Baker, Sherry L.
    SPACE TELESCOPES AND INSTRUMENTATION 2008: ULTRAVIOLET TO GAMMA RAY, PTS 1 AND 2, 2008, 7011
  • [36] The first diffraction-limited images from the W M Keck telescope
    Matthews, K
    Ghez, AM
    Weinberger, AJ
    Neugebauer, G
    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1996, 108 (725) : 615 - 619
  • [37] High-resolution images from low-resolution compressed video
    Segall, CA
    Molina, R
    Katsaggelos, AK
    IEEE SIGNAL PROCESSING MAGAZINE, 2003, 20 (03) : 37 - 48
  • [38] Keck mid-IR high-resolution imaging of ARP 220
    Egami, E
    Soifer, BT
    Neugebauer, G
    Matthews, K
    Becklin, EE
    Weinberger, AJ
    Ressler, M
    Werner, MW
    ASTROPHYSICS AND SPACE SCIENCE, 1999, 266 (1-2) : 109 - 111
  • [39] Keck high-resolution spectroscopy of outflows in infrared-luminous galaxies
    Rupke, DS
    Veilleux, S
    ASTROPHYSICAL JOURNAL, 2005, 631 (01): : L37 - L40
  • [40] Keck mid-ir High-Resolution Imaging of arp 220
    E. Egami
    B.T. Soifer
    G./fnms> Neugebauer
    K. Matthews
    E. E. Becklin
    A. J. Weinberger
    M. Ressler
    M. W. Werner
    Astrophysics and Space Science, 1999, 266 : 109 - 111