Electronic Telegram No. 5075
Central Bureau for Astronomical Telegrams
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(554099) 2012 KU_50
     C. O. Chandler and C. A. Trujillo, Northern Arizona University; and W. M.
Grundy and J. K. Kueny, Lowell Observatory, report that fifteen archival 40-s
VR-band images captured by observers L. Allen, D. Herrera, and D. James on
2014 Apr. 23-25 as part of the DECam NEO Survey with the National Science
Foundation/NOIRLab Dark Energy Camera on the Blanco 4-m telescope at the Cerro
Tololo Inter-American Observatory, reveal that the transneptunian minor planet
(554099) is a binary system.  The primary and secondary were separately
resolved in all images and were measured to have a mean separation of 1".37,
implying a separation of at least 30000 km and thus a semimajor axis of their
mutual orbit of at least 15000 km.  Relative positions on the sky in R.A. and
Decl. were measured to be (+1".36, -0".14), (+1".35, -0".13), and (+1".37,
-0".17) for 2014 Apr. 23, 24, and 25, respectively.


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2021 November 27                 (CBET 5075)              Daniel W. E. Green