[IAUC] CBET 2592: 20101218 : (596) SCHEILA

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                                                  Electronic Telegram No. 2592
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau en eps.harvard.edu (alternate cbat en iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


(596) SCHEILA
     L. A. Molnar, Calvin College, reports that photometric lightcurve
observations of the minor planet (596), taken on Dec. 14.30-14.54 and 15.33-
15.53 UT with the 0.40-m f/8 Ritchey-Chretien telescope of the Calvin-Rehoboth
Observatory, folded on the rotational period of Warner (2006, Minor Planet
Bull. 33, 58-62) display a shape similar to those previous measurements with
an amplitude that is the same (0.09 magnitude).  The average brightness was
observed to be a full magnitude above the expected value, as it has been since
the outburst was first observed on Dec. 3 (Warner and Harris, CBET 2590;
Larson, IAUC 9188).  There are two models of the increased brightness:
reflection off material surrounding the solid object (as in a cometary
outburst) or increased albedo of the object's surface (caused by a coating of
lighter material).  The cometary outburst model suggests a lightcurve
amplitude diminished by 2.5 times, and is thus disfavored.   The albedo model
predicts no large change in amplitude, as is observed; it also predicts that
the enhanced brightness will persist indefinitely.

     Corrigendum.  On CBET 2590, first paragraph, line 16, FOR  2004-2005,
READ  2005-2006,


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2010 CBAT
2010 December 18                 (CBET 2592)              Daniel W. E. Green