Observations of the Centaur 1999 UG5: Evidence of a Unique Outer Solar System Surface

Details Observations of the Centaur 1999 UG5: Evidence of a Unique Outer Solar System Surface Observations of the Centaur 1999 UG5: Evidence of a Unique Outer Solar System Surface

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pasp..114.1309b&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 114, Issue 802, pp. 1309-1321.

Astronomy and Astrophysics

Astronomy

20

Kuiper Belt, Minor Planets, Asteroids, Oort Cloud

Scientific paper

The outer solar system body 1999 UG5 is a Centaur of medium brightness and slightly redder color when compared to other Centaurs. Similar to at least 1/5 of the known Centaurs, it is a Saturn-crosser with a mean orbital distance between Saturn and Uranus. We present optical photometry data and near-IR spectra obtained during 2000 September, November, and December. We find a rotation period of 13.41+/-0.04 hr with an amplitude of 0.102+/-0.005 mag and a phase curve with a Lumme-Bowell G value of -0.13+/-0.02. BVRI colors are reported, and they confirm the red spectral gradient observed previously. Our spectra reveal that this redward slope extends into near-IR wavelengths and indicates possible localized differences in the surface composition.

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