Optical and infrared observations of the Centaur 1997 CU26

McBride, Neil and Davies, John K. and Green, Simon F. and Foster, Michael J. (1999) Optical and infrared observations of the Centaur 1997 CU26. Monthly Notices of the Royal Astronomical Society, 306 (4). pp. 799-805. ISSN 0035-8711. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Minor planet 1997 CU26 is a Centaur, and is probably undergoing dynamical evolution inwards from the Kuiper Belt. We present optical and infrared (VRIJHK) photometry which gives mean colours of V - R = 0.46 +/- 0.02, V - I = 1.02 +/- 0.02, V - J = 1.74 +/- 0.02, V - H = 2.15 +/- 0.02 and V - K = 2.25 +/- 0.02. The resulting relative reflectance spectrum lies between those of Chiron and Pholus (although closer to that of Chiron). A 1.6-2.6 mu m spectrum confirms the broad absorption feature at 2.05 mu m associated with water ice reported by Brown et al. 1997 CU26 displays no significant light curve variation and (unlike Chiron) has no observable coma. We place an upper limit to the dust production rate of 1.5 kg s(-1). J-band data taken at phase angles of 1.degrees 7 to 4.degrees 0 give a phase parameter of G(J) = 0.36 +/- 0.1, and are consistent with a phase parameter of G = 0.15 in the V band (a value often assigned to low-albedo objects when no other information is available) if we assume a phase reddening of 0.017 mag deg(-1) in the J band. We find V(1; alpha = 4.degrees 1) = 7.022 +/- 0.02, from which we deduce, by assuming G = 0.15 +/- 0.1, an absolute visual magnitude of H-V = 6.64 +/- 0.04.

Item Type: Article
Uncontrolled keywords: minor planets, asteroids; infrared : Solar system
Subjects: Q Science > Q Science (General)
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: I.T. Ekpo
Date Deposited: 07 Apr 2009 15:16
Last Modified: 21 May 2014 10:44
Resource URI: https://kar.kent.ac.uk/id/eprint/16923 (The current URI for this page, for reference purposes)
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