Whole-disk spectrophotometric properties of Mercury: Synthesis of MESSENGER and ground-based observations
2010 (English)In: Icarus (New York, N.Y. 1962), ISSN 0019-1035, E-ISSN 1090-2643, Vol. 209, no 1, 101-124 p.Article in journal (Refereed) Published
Disk-integrated and disk-resolved measurements of Mercury's surface obtained by both the Mercury Dual Imaging System (MDIS) and the Mercury Atmospheric and Surface Composition Spectrometer (MASCS) onboard the MErcury Surface. Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft were analyzed and compared with previous ground-based observations of Mercury at 11 wavelengths The spectra show no definitive absorption features and display a red spectral slope (increasing reflectance with increasing wavelength) typical of space-weathered rocky sui faces The MDIS spectra show evidence of phase reddening, which is not observed in the MASCS spectra The MDIS spectra are commensurate with ground-based observations to within 10%, whereas the MASCS spectra display greater discrepancies with ground-based observations at near-infrared wavelengths The derived photometric calibrations provide corrections within 10% for observations taken at phase angles less than similar to 100 degrees The derived photometric properties are indicative of a more compact regolith than that of the lunar surface or of average S-type asteroids The photometric roughness of the cur face is also much smoother than the Moon's The calculated geometric albedo (reflectance at zero phase) is higher than lunar values The lower reflectance of immature units on Mercury compared with immature units Oil the Moon, in conjunction with the higher geometric albedo, is indicative of more complicated grain structures within Mercury's regolith.
Place, publisher, year, edition, pages
2010. Vol. 209, no 1, 101-124 p.
Photometry, Mercury, Spectra
IdentifiersURN: urn:nbn:se:uu:diva-135012DOI: 10.1016/j.icarus.2010.02.022ISI: 000281687800011OAI: oai:DiVA.org:uu-135012DiVA: diva2:374292