Discovered by A. Mrkos MPC designation 4090 Říšehvězd Discovered 2 September 1986 Orbits Sun | Discovery date 2 September 1986 Minor planet category main-belt · (inner) Absolute magnitude 13.1 Asteroid group Asteroid belt | |
Named after Říše hvězd(astronomy journal) Alternative names 1986 RH1 · 1931 FF1971 KB · 1982 KX1988 AR3 · 1989 GU Similar 4015 Wilson–Harrington, Sun, 45P/Honda–Mrkos–Pajdušáková, 9007 James Bond | ||
4090 Říšehvězd, provisional designation 1986 RH1, is a stony asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered by Czech astronomer Antonín Mrkos at Kleť Observatory on 2 September 1986. Among the more than 20,000 named minor planets, it is known as the one with the most diacritics in its name.
The S-type asteroid orbits the Sun at a distance of 1.9–2.9 AU once every 3 years and 7 months (1,322 days). Its orbit has an eccentricity of 0.21 and an inclination of 1° with respect to the ecliptic. The first observation was made at the U.S. Yerkes Observatory in 1931, extending the asteroid's observation arc by 55 years prior to its official discovery.
In 2009 and 2014, several rotational light-curves were obtained for this asteroid at the Palomar Transient Factory. They gave a concurring rotation period between 4.53 and 4.56 hours with a brightness variation between 0.32 and 0.41 magnitude (U=2/2/2).
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 7.2 kilometers in diameter and its surface has an albedo of 0.149, while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 6.3 kilometers, based on an absolute magnitude of 13.38.
The minor planet was named after the periodically released Czech popular astronomy journal Říše hvězd ("the realm of stars"), which was initially published by the Czech Astronomical Society. It reported discoveries in the fields of astronomy, astrophysics and space exploration and supplied information about the Czech–Slovak astronomical community. The body's name was proposed by Jana Tichá, Miloš Tichý and Zdeněk Moravec. Naming citation was published on 28 August 1996 (M.P.C. 27734).