Electronic Telegram No. 5751
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
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(459865) 2013 XZ_8
     B. Proudfoot, Florida Space Institute; and W. Grundy, D. Trilling, and E. 
Clark, Northern Arizona University, report that the centaur-type minor planet
(459865) is a tight, approximately equal-sized binary, where the secondary is 
0.35 +/- 0.09 mag fainter than the primary.  The binary was discovered in two 
500-s Hubble Space Telescope exposures taken with the WFC3/UVIS camera (+ 
F555W filter) on 2025 June 5 (HST Program 17755, P.I. D. Trilling).  At the 
time of the HST imaging, the resolved components were separated by 0".045 +/- 
0".013 in p.a. 157.3 +/- 3.2 deg.  At the time of the first image (2025 June 
5.74345 UT), the primary was located at R.A. = 17h11m22s.15, Decl. = 
-26d37'34".7 (equinox J2000.0). 


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                         (C) Copyright 2026 CBAT
2026 September 28                (CBET 5751)              Daniel W. E. Green