Visible and near-infrared photometry of the centaur objects 1995 GO and 5145 Pholus

David A. Weintraub, Stephen C Tegler, W. Romanishin

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We present visible and near-infrared broadband photometry of the Centaur objects 1995 GO and 5145 Pholus. Our data confirm the extremely redV-Jcolor and nearly solarJ-HandH-Kcolors of 5145 Pholus. OurV-Jdata reveal that 1995 GO is as red as the reddest D-type asteroid, 1748 Mauderli, but not nearly as red as 5145 Pholus. We suggest that the red color of 1995 GO is probably due to the presence of organic-rich materials produced by eons of particle bombardment and ultraviolet irradiation of surface grains, a process that may be widespread among the Centaur and trans-neptunian object populations. We show that theV-Jdata for the Centaurs suggest thatV-Jincreases with increasing semimajor axis. If this correlation is correct, then the red colors of the Centaurs 5145 Pholus and 1993 HA2may be typical of fairly pristine Centaur objects. In contrast, the progressively less red colors of 1995 GO and 2060 Chiron may be the result of an increased rate of resurfacing of these objects as they migrate progressively closer to the Sun.

Original languageEnglish (US)
Pages (from-to)456-463
Number of pages8
JournalIcarus
Volume128
Issue number2
DOIs
StatePublished - Aug 1997

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infrared photometry
near infrared
color
Chiron
trans-Neptunian objects
organic materials
asteroids
asteroid
photometry
bombardment
irradiation
broadband

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Visible and near-infrared photometry of the centaur objects 1995 GO and 5145 Pholus. / Weintraub, David A.; Tegler, Stephen C; Romanishin, W.

In: Icarus, Vol. 128, No. 2, 08.1997, p. 456-463.

Research output: Contribution to journalArticle

Weintraub, David A. ; Tegler, Stephen C ; Romanishin, W. / Visible and near-infrared photometry of the centaur objects 1995 GO and 5145 Pholus. In: Icarus. 1997 ; Vol. 128, No. 2. pp. 456-463.
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