130 Elektra is a very large outer main beltasteroid. It was discovered by C. H. F. Peters on February 17, 1873 and named after Electra, an avenger in Greek mythology. Its spectrum is of the G type, hence it probably has a Ceres-like composition. Spectral signatures of organic compounds have been seen on Elektra's surface [1]. Recent optical observations have found a satellite (see below). Using its orbit, Elektra's mass can be reliably found. The value of 1.3×1019 kg indicates an unusually high density (for asteroids) of 3.8 ± 0.3 g/cm³. Optical observations have also determined that Elektra's shape is quite irregular, as well as giving indications of albedo differences of 5-15% on its surface[2]. This is uncommon, and corroborates with Elektra's high density to indicate that it is probably a solid, rather than fractured or rubble pile, body.
Satellite (S/2003 (130) 1)
In 2003, a small moon of Elektra was detected using the Keck II telescope. The diameter of the satellite is 4 km and it orbits at a distance of about 1170 km. The satellite has been given the provisional designation S/2003 (130) 1. Due to only a few observations to date, its orbit is still relatively loosely constrained [3].
