Electronic Telegram No. 5066 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 (130) ELEKTRA A. Berdeu, National Astronomical Research Institute of Thailand; M. Langlois, Centre de Recherche Astrophysique de Lyon; and F. Vachier, Observatoire de Paris, report the discovery of a third satellite around the minor planet (130) Elektra. The satellite has been detected with the Very Large Telescope (+ SPHERE/IFS) at three different epochs between 2014 Dec. 9 and 31. On Dec. 9.074 UT, the satellite was found at a separation of 0".258 (projected separation 333 km) in p.a. 164.2 degrees; on Dec. 30.058, the satellite was found at a separation of 0".229 (projected separation 327 km) in p.a. 191.6 degrees. Based on these detections, the mean magnitude difference through the YJH (0.95- to 1.65-micron) band between minor planet (130) and its companion is 10.52 +/- 0.5, implying a diameter of about 1.6 km. Preliminary orbit computation indicates an orbital period of about 0.7 days for the satellite, with a semi-major axis of 345 km. The already-known satellites of (130), discovered in 2003 (cf. IAUC 8183) and in 2014 (cf. CBET 4036), are detected on the three epochs with separations from the primary body varying from 0".63 to 0".7 and from 0".32 to 0".36, respectively. Minor planet (130) becomes the first quadruple system discovered and imaged in the main asteroid belt. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2021 CBAT 2021 November 6 (CBET 5066) Daniel W. E. Green