W. J. Merline, Southwest Research Institute (SwRI); P. M. Tamblyn, Binary Astronomy, Golden, CO, and SwRI; C. Dumas, Jet Propulsion Laboratory; L. M. Close, University of Arizona; C. R. Chapman, SwRI; and F. Menard, Observatoire de Grenoble, report the discovery on Aug. 15.6 UT of a satellite of minor planet (130) Elektra from K'- and H-band imaging with the 10-m Keck II Telescope (+ NIRC2/AO adaptive optics system) on Mauna Kea. On Aug. 15.6417, the satellite was at separation 0".72 (projected separation 1170 km) and position angle 70 deg. The satellite was confirmed by the same team, also at Keck II, on Aug. 17.6. The K'-band brightness difference is about 8.5 mag, giving an estimated diameter of the satellite of about 4 km.
International Astronomical Union Circular
- Pub Date:
- August 2003