Electronic Telegram No. 5084
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


2021 DN_15
     S. S. Sheppard, Carnegie Institution for Science; D. J. Tholen,
University of Hawaii; and C. A. Trujillo, Northern Arizona University, report
that discovery images from the Subaru 8-m meter telescope on Mauna Kea on 2021
Feb. 17 reveal that the transneptunian minor planet 2021 DN_15 (cf. MPEC
2021-Y17) is a binary system.  The primary and secondary were separately
resolved in two images and were measured to have a mean separation of 1".05.
The secondary was about 0.1 magnitude fainter and at position angle about 3
deg from the primary.  Follow-up images from the Magellan 6.5-m telescope on
2021 Mar. 9, 17, and 18 again showed the binary nature of the object with
similar characteristics as at discovery.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2021 CBAT
2021 December 19                 (CBET 5084)              Daniel W. E. Green