Electronic Telegram No. 5737
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)
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Prepared using the Tamkin Foundation Computer Network


(175113) 2004 PF_115
     B. Proudfoot, Florida Space Institute; W. Grundy, Northern Arizona 
University; D. Ragozzine and D. Spencer, Brigham Young University; B. Holler, 
Space Telescope Science Institute; and F. L. Rommel and E. Fernandez-
Valenzuela, Florida Space Institute, report that the transneptunian object 
(175113) is a tight, approximately equal-sized binary where the secondary is 
1.06 +/- 0.07 mag fainter than the primary.  The binary was discovered in
four 350-s Hubble Space Telescope exposures taken with the WFC3/UVIS camera
(+ F350LP filter) on 2026 Sept. 8.  At the time of the HST imaging, the
resolved components were separated by 0".078 +/- 0".001 in p.a. 232.6 +/- 1.9 
degrees.  At the time of the first image (Sept. 8.45257 UT), the primary was 
located at R.A. = 23h45m07.71s, Decl. = -16d29'40".9 (equinox J2000.0). 


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                         (C) Copyright 2026 CBAT
2026 September 14                (CBET 5737)              Daniel W. E. Green