Electronic Telegram No. 5683 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 (130247) 2000 CE_85 G. Viscome and D. Benjamin, International Occultation Timing Association (IOTA), report the discovery of an apparent satellite of minor planet (130247) based on an occultation of the star Tycho-2 1882-01451-1 (which has catalogued Gaia magnitudes G = 9.58 and R = 8.82, and an apparent diameter of 0".00018 from the Gaia FLAME and GSP-Aeneas values of the star's radius in solar radii), as observed on 2026 Mar. 5.14 UT. The main-belt asteroid was 10 magnitudes fainter than the star. Viscome observed from Paul Smiths, NY, USA, using a 15-cm telescope (+ Astrid GPS disciplined CMOS video system) and recorded two consecutive occultations of duration 0.85 and 0.15 s, corresponding to chord lengths of 5.3 and 0.9 km, respectively, with the interval between the chords being 0.50 s. Benjamin observed from Wadhams, NY, USA, using a 15-cm telescope (+ Astrid GPS disciplined CMOS video system) and recorded a single occultation of duration 0.53 s, corresponding to a chord length of 3.3 km. The two sites were 67 km apart on the ground, and their chords were 2.2 km apart on the fundamental plane. The flux of the first drop in Viscome's recording was to the limiting magnitudes of approximately 11.7 (G) and 11.0 (R), while the second drop was to the magnitudes of comparison star Tycho-2 1878-00114-1 -- 10.7(G) and 10.6 (R). The flux of the drop in Benjamin's light curve was to the limiting magnitudes of approximately 12.8 (G) and 12.0 (R). The depth of the two light drops in Viscome's recording excludes a double star from being an explanation. The NEOWISE diameter of the asteroid is 5.3 +/- 0.6 km. There are no known shape models for the asteroid. The data in Carry et al. (2024, A.Ap. 687, A38) suggest that this asteroid is significantly oblate (but with a large uncertainty), with the major axis orientated in p.a. 90 degrees, while the magnitude measurements in Gaia FPR suggest a moderately oblate asteroid. Fresnel light curves were matched to the observed light curves, with the main body being represented as an ellipse with dimensions 5.5 km x 4.1 km (broadly consistent with the NEOWISE diameter) and the major axis oriented in position angle 90 degrees. The width and depth of the light curve for the assumed satellite indicate that the observed chord was not central but passed near its limb. Assuming that the assumed satellite is spherical, the light curve is consistent with its diameter being between 0.7 and 1.5 km. The assumed satellite is at a separation of 0".00401 in p.a. 274 +/- 5 degrees, with a sky-plane separation of 6.30 km. The observed light curves, as well as those derived from Fresnel modeling, can be found at the following website URL: http://www.cbat.eps.harvard.edu/iau/cbet/005600/CBET5683_Fig1.png, with the light curve for Benjamin indicating the location corresponding to the "satellite event" in Viscome's recording. The sky-plane plot of the system, together with the Fresnel models for the minimum and maximum size of the satellite, is posted at website URL http://www.cbat.eps.harvard.edu/iau/cbet/005600/CBET5683_Fig2.png. D. Herald and D. Gault, Trans-Tasman Occultation Alliance; and C. Weber, European Section of the IOTA, aided in the analysis, while B. Anderson (IOTA) provided the Fresnel diffraction software. The reader is also referred to the end notes on CBET 5679. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2026 CBAT 2026 April 22 (CBET 5683) Daniel W. E. Green