Electronic Telegram No. 5351
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
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Prepared using the Tamkin Foundation Computer Network


2009 YK_32
     K. Ly, University of California at Los Angeles, writes that he has
detected an apparent companion to the transneptunian object 2009 YK_32 in
six archival 30-s exposure r-band images taken on 2016 Jan. 6.31-6.55 UT
with the 8.2-m Subaru telescope's Hyper-Suprime Cam on Mauna Kea (observer
R. Jedicke).  The following information was measured by W. M. Grundy
(Lowell Observatory) and Ly:  The two components were nearly resolved in
all images with a mean separation of 0".64 +/- 0".06, corresponding to a
projected separation distance of 20000 +/- 2000 km.  The mean brightnesses
of the two components were almost identical, although the northwestern
component appeared fainter by 0.2 +/- 0.1 mag in four of the six images.
The fainter northwestern component was positioned at p.a. 323 +/- 4 deg
from the primary component.  The following astrometry and r-band
magnitudes are for the center of light and the combined fluxes.

     2016 UT             R.A. (2000) Decl.       Mag.   Observer
     Jan.  6.31407    7 28 20.44   +21 54 31.9   22.1   Jedicke
           6.55432    7 28 19.18   +21 54 34.7   22.1     "


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2024 February 20                 (CBET 5351)              Daniel W. E. Green