Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· References in the article
· Citations to the Article (30) (Citation History)
· Refereed Citations to the Article
· Associated Articles
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Deep Impact photometry of Comet 9P/Tempel 1
Authors:
Li, Jian-Yang; A'Hearn, Michael F.; Belton, Michael J. S.; Crockett, Christopher J.; Farnham, Tony L.; Lisse, Carey M.; McFadden, Lucy A.; Meech, Karen J.; Sunshine, Jessica M.; Thomas, Peter C.; Veverka, Joe
Affiliation:
AA(Department of Astronomy, University of Maryland, College Park, MD 20742, USA), AB(Department of Astronomy, University of Maryland, College Park, MD 20742, USA), AC(Belton Space Exploration Initiatives, LLC, Tucson, AZ 85716, USA), AD(Department of Astronomy, University of Maryland, College Park, MD 20742, USA), AE(Department of Astronomy, University of Maryland, College Park, MD 20742, USA), AF(Department of Astronomy, University of Maryland, College Park, MD 20742, USA; Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723, USA), AG(Department of Astronomy, University of Maryland, College Park, MD 20742, USA), AH(Institute for Astronomy and NASA Astrobiology Institute, University of Hawaii, Honolulu, HI 96822, USA), AI(Department of Astronomy, University of Maryland, College Park, MD 20742, USA), AJ(Center for Radiophysics and Space Research, Cornell University, Ithaca, NY 14853, USA), AK(Center for Radiophysics and Space Research, Cornell University, Ithaca, NY 14853, USA)
Publication:
Icarus, Volume 187, Issue 1, p. 41-55. (Icarus Homepage)
Publication Date:
03/2007
Origin:
ELSEVIER
DOI:
10.1016/j.icarus.2006.09.018
Bibliographic Code:
2007Icar..187...41L

Abstract

The photometric properties of the nucleus of Comet 9P/Tempel 1 are studied from the disk-resolved color images obtained by Deep Impact (DI). Comet Tempel 1 has typical photometric properties for comets and dark asteroids. The disk-integrated spectrum of the nucleus of Tempel 1 between 309 and 950 nm is linear without any features at the spectral resolution of the filtered images. At V-band, the red slope of the nucleus is 12.5±1% per 100 nm at 63° phase angle, translating to B V=0.84±0.01, V R=0.50±0.01, and R I=0.49±0.02. No phase reddening is confirmed. The phase function of the nucleus of Tempel 1 is constructed from DI images and earlier ground-based observations found from the literature. The phase coefficient is determined to be β=0.046±0.007 mag/deg between 4° and 117° phase angle. Hapke's theoretical scattering model was used to model the photometric properties of this comet. Assuming a single Henyey Greenstein function for the single-particle phase function, the asymmetry factor of Tempel 1 was fitted to be g=-0.49±0.02, and the corresponding single-scattering albedo (SSA) was modeled to be 0.039±0.005 at 550 nm wavelength. The SSA spectrum shows a similar linear slope to that of the disk-integrated spectrum. The roughness parameter is found to be 16°±8°, and independent of wavelength. The Minnaert k parameter is modeled to be 0.680±0.014. The photometric variations on Tempel 1 are relatively small compared to other comets and asteroids, with a ˜20% full width at half maximum of albedo variation histogram, and ˜3% for color. Roughness variations are evident in one small area, with a roughness parameter about twice the average and appearing to correlate with the complex morphological texture seen in high-resolution images.

Associated Articles

Related Paper     Main Paper    

Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints