Variability measurements of KBOs and Centaurs discovered by the Deep Ecliptic Survey

Details Variability measurements of KBOs and Centaurs discovered by the Deep Ecliptic Survey Variability measurements of KBOs and Centaurs discovered by the Deep Ecliptic Survey

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002dps....34.0704k&link_type=abstract

American Astronomical Society, DPS Meeting #34, #07.04; Bulletin of the American Astronomical Society, Vol. 34, p.845

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Scientific paper

We have begun a variability study for a selection of KBOs and Centaurs discovered by the Deep Ecliptic Survey. Our sample includes mostly objects at southern declinations, since we can advantageously observe these with the 6.5-m Baade telescope at Las Campanas Observatory using MagIC (Magellan Instant Camera). During the nights of UT 2002 July 9-13 and 17-18 we abtained measurements over a time span of 4-8 hours for 21 KBOs and Centaurs. These objects range in R magnitude between 19.3 and 23.1. Two objects exhibited particularly interesting variability: 2000QC243 and 2000QB243. The former is a Centaur for which we fit a period of 4.65 +/- 0.07 hours with an amplitude of 0.19 +/- 0.01 magnitudes. Fitting the data as double-peaked lightcurve yields a period of 9.30 +/- 0.14 hours. The later is a "SD-N" (Scattered Disk-Near) object with a semi-major axis of 34.6 +/- 0.1 AU and an eccentricity of 0.560 +/- 0.002. This object is variable on the timescale of 5 hours with an amplitude of 0.2 magnitudes. Of the other 19 objects, 6 are possibly variable above 0.15 magnitudes and 13 are flat below this level. This percentage of variability appears comparable to the 31% in the sample of KBOs investigated by Sheppard & Jewitt (2002 AJ, in press). This work was supported, in part, by NASA Grant NAG5-10444.

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