Other
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.306..799m&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 306, Issue 4, pp. 799-805.
Other
18
Scientific paper
Minor planet 1997 CU_26 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 1.6-2.6mum spectrum confirms the broad absorption feature at 2.05mum associated with water ice reported by Brown et al. 1997 CU_26 displays no significant light curve variation and (unlike Chiron) has no observable coma. We place an upper limit to the dust production rate of 1.5kgs^-1. J-band data taken at phase angles of 1.7 deg to 4.0 deg 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 0.017magdeg^-1 in the J band. We find V(1, alpha=4.1 deg) =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.
Davies John K.
Foster John M.
Green Simon F.
McBride Neil
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