[Iaude] CBET 5081: (37424) 2001 YA_3

quai at eps.harvard.edu quai at eps.harvard.edu
Thu Dec 9 19:15:40 EST 2021

                                                  Electronic Telegram No. 5081
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau at eps.harvard.edu (alternate cbat at iau.org)
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Prepared using the Tamkin Foundation Computer Network

(37424) 2001 YA_3
     V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; P. Sogorb, La Bastide des Jourdans, France; and R. Durkee, Shed
of Science South Observatory (SSSO), Pontotoc, TX, U.S.A., report that
photometric observations taken with a 0.35-m telescope at the Sopot
Observatory in Serbia, a 0.28-m telescope at the Bastidan Observatory in
France, and a 0.50-m telescope at the SSSO during Sept. 26-Nov. 7 reveal that
minor planet (37424) is a binary system with an orbital period of 18.956 +/-
0.006 hr.  The primary shows a period of 2.8251 +/- 0.0002 hr and has a
lightcurve amplitude of 0.11 magnitude at solar phases 6-9 degrees, suggesting
a nearly spheroidal shape.  Mutual eclipse/occultation events that are 0.05
magnitude deep indicate a lower limit on the secondary-to-primary mean-
diameter ratio of 0.22.  SSSO observations taken on Nov. 7 showed a 0.07-mag-
deep brightness attenuation centered at Nov. 7.3069 UT and lasting for 35 min
that was not phased to the 0.05-mag-deep mutual events repeating with the
18.956-hr period above; the suspicion that it was a mutual event by a second
satellite needs to be confirmed with future observations.

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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2021 CBAT
2021 December 9                  (CBET 5081)              Daniel W. E. Green

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