Infrared (0.83-5.1 μm) photometry of Phoebe from the Cassini Visual Infrared Mapping Spectrometer

B. J. Buratti, K. Soderlund, J. Bauer, J. A. Mosher, M. D. Hicks, D. P. Simonelli, R. Jaumann, R. N. Clark, Robert H. Brown, D. P. Cruikshank, T. Momary

Research output: Contribution to journalArticle

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Abstract

Three weeks prior to the commencement of Cassini's 4 year tour of the saturnian system, the spacecraft executed a close flyby of the outer satellite Phoebe. The infrared channel of the Visual Infrared Mapping Spectrometer (VIMS) obtained images of reflected light over the 0.83-5.1 μm spectral range with an average spectral resolution of 16.5 nm, spatial resolution up to 2 km, and over a range of solar phase angles not observed before. These images have been analyzed to derive fundamental photometric parameters including the phase curve and phase integral, spectral geometric albedo, bolometric Bond albedo, and the single scattering albedo. Physical properties of the surface, including macroscopic roughness and the single particle phase function, have also been characterized. Maps of normal reflectance show the existence of two major albedo regimes in the infrared, with gradations between the two regimes and much terrain with substantially higher albedos. The phase integral of Phoebe is 0.29 ± 0.03, with no significant wavelength dependence. The bolometric Bond albedo is 0.023 ± 007. We find that the surface of Phoebe is rough, with a mean slope angle of 33°. The satellite's surface has a substantial forward scattering component, suggesting that its surface is dusty, perhaps from a history of outgassing. The spectrum of Phoebe is best matched by a composition including water ice, amorphous carbon, iron-bearing minerals, carbon dioxide, and Triton tholin. The characteristics of Phoebe suggest that it originated outside the saturnian system, perhaps in the Kuiper Belt, and was captured on its journey inward, as suggested by Johnson and Lunine (2005).

Original languageEnglish (US)
Pages (from-to)309-322
Number of pages14
JournalIcarus
Volume193
Issue number2
DOIs
StatePublished - Feb 2008

Fingerprint

Phoebe
albedo
photometry
spectrometer
spectrometers
scattering
satellite surfaces
Kuiper belt
outgassing
slope angle
forward scattering
spectral resolution
roughness
carbon dioxide
reflectance
spacecraft
ice
spatial resolution
phase shift
physical property

Keywords

  • Infrared observations
  • Photometry
  • satellites
  • Satellites
  • Saturn
  • surfaces

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Buratti, B. J., Soderlund, K., Bauer, J., Mosher, J. A., Hicks, M. D., Simonelli, D. P., ... Momary, T. (2008). Infrared (0.83-5.1 μm) photometry of Phoebe from the Cassini Visual Infrared Mapping Spectrometer. Icarus, 193(2), 309-322. https://doi.org/10.1016/j.icarus.2007.09.014

Infrared (0.83-5.1 μm) photometry of Phoebe from the Cassini Visual Infrared Mapping Spectrometer. / Buratti, B. J.; Soderlund, K.; Bauer, J.; Mosher, J. A.; Hicks, M. D.; Simonelli, D. P.; Jaumann, R.; Clark, R. N.; Brown, Robert H.; Cruikshank, D. P.; Momary, T.

In: Icarus, Vol. 193, No. 2, 02.2008, p. 309-322.

Research output: Contribution to journalArticle

Buratti, BJ, Soderlund, K, Bauer, J, Mosher, JA, Hicks, MD, Simonelli, DP, Jaumann, R, Clark, RN, Brown, RH, Cruikshank, DP & Momary, T 2008, 'Infrared (0.83-5.1 μm) photometry of Phoebe from the Cassini Visual Infrared Mapping Spectrometer', Icarus, vol. 193, no. 2, pp. 309-322. https://doi.org/10.1016/j.icarus.2007.09.014
Buratti BJ, Soderlund K, Bauer J, Mosher JA, Hicks MD, Simonelli DP et al. Infrared (0.83-5.1 μm) photometry of Phoebe from the Cassini Visual Infrared Mapping Spectrometer. Icarus. 2008 Feb;193(2):309-322. https://doi.org/10.1016/j.icarus.2007.09.014
Buratti, B. J. ; Soderlund, K. ; Bauer, J. ; Mosher, J. A. ; Hicks, M. D. ; Simonelli, D. P. ; Jaumann, R. ; Clark, R. N. ; Brown, Robert H. ; Cruikshank, D. P. ; Momary, T. / Infrared (0.83-5.1 μm) photometry of Phoebe from the Cassini Visual Infrared Mapping Spectrometer. In: Icarus. 2008 ; Vol. 193, No. 2. pp. 309-322.
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AU - Soderlund, K.

AU - Bauer, J.

AU - Mosher, J. A.

AU - Hicks, M. D.

AU - Simonelli, D. P.

AU - Jaumann, R.

AU - Clark, R. N.

AU - Brown, Robert H.

AU - Cruikshank, D. P.

AU - Momary, T.

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