The solar phase curve for the bright Plutino 2000 EB173

Details The solar phase curve for the bright Plutino 2000 EB173 The solar phase curve for the bright Plutino 2000 EB173

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001dps....33.0806r&link_type=abstract

American Astronomical Society, DPS Meeting #33, #08.06; Bulletin of the American Astronomical Society, Vol. 33, p.1034

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Scientific paper

Here we report measurements of the phase curve for 2000 EB173, a bright Plutino with opposition magnitude R=19.1 and red color V-R=0.57+/-0.05 discovered by the QUEST survey[1]. We made all observations from November 2000 to May 2001 with 1.0-meter Yale Telescope at Cerro Tololo, Chile using Johnson V and R filters and CCD. Exposures times were short (<5 minutes) to allow small-aperture photometry, calibrated with secondary standards in each field which we observed on photometric nights. The phase curve, measured from phases of 0.28 to 1.9 degrees, is linear with a slope of 0.165 mag/deg. Assuming a curve of the form defined by Bowell et al. [2], a minimal chi-squared fit to our R observations yields H=4.99+/-0.01, G=0.16+/-0.06 (assuming V-R=0.57). We see no evidence for rotational modulation greater than 0.05 magnitudes, and the V-R color we measure at phase angle 1.8 degrees is consistent with earlier measurements. The phase curve is unusually steep compared to other icy bodies observed in the outer solar system [3]. [1] Ferrin, I. et al., ApJ 548, L243-247, 2001; [2] Bowell, E. et al., in Asteroids II (eds. Binzel, R. P., Gehrels. T., and Matthews, M.S). 524-556 (U. Arizona Press Tucson, 1989) ; [3] Schaefer, B. and Tourtellotte, S., Icarus 151, 112-117, 2001.

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