Photometric Light Curve for the Kuiper Belt Object 2000 EB173 on 78 Nights |
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| Authors: | Bradley E SchaeferDavid L Rabinowitz |
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| Institution: | a Department of Astronomy, University of Texas, C-1400, Austin, Texas, 78712, f1schaefer@astro.as.utexas.eduf1b Yale Center for Astronomy and Astrophysics, Physics Department, Yale University, P.O. Box 208121, New Haven, Connecticut, 06520-8121 |
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| Abstract: | Kuiper belt objects (KBOs) are generally very faint and cannot in practice be monitored with a well-sampled long-term light curve; so our discovery of the bright KBO 2000 EB173 offers an excellent opportunity for synoptic studies. We present a well-sampled photometric time series (77 R and 29 V magnitudes on 78 nights) over a 225-day time span centered on the 2001 opposition. The light curve (corrected to the year 2001 opposition distance) varies from 19.11 to 19.39 mag with a single peak that is smooth, time symmetric, and coincident with opposition. All variations in the light curve are consistent with a linear opposition surge (ROPP=19.083+0.125∗α, where α is the solar phase angle), while any rotational modulation must have a peak-to-peak amplitude of less than 0.097 mag. This is the first measured opposition surge for any KBO (other than Pluto). The V−R color is 0.63±0.02, with no apparent variation with phase at the few percent level. With R=19.11 at opposition, 2000 EB173 remains the brightest known KBO and a prime target for future photometric and spectroscopic studies. |
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| Keywords: | Kuiper belt objects |
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