| Discovery[1] | |
|---|---|
| Discovered by | A. Mrkos |
| Discovery site | Kleť Obs. |
| Discovery date | 2 September 1986 |
| Designations | |
| (4090) Říšehvězd | |
Named after | Říše hvězd (astronomy journal)[2] |
| 1986 RH1 · 1931 FF 1971 KB · 1982 KX 1988 AR3 · 1989 GU | |
| main-belt · (inner)[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 86.03 yr (31,421 days) |
| Aphelion | 2.8513AU |
| Perihelion | 1.8632 AU |
| 2.3573 AU | |
| Eccentricity | 0.2096 |
| 3.62yr (1,322 days) | |
| 252.91° | |
| 0° 16m 20.28s / day | |
| Inclination | 1.3288° |
| 266.55° | |
| 4.4078° | |
| Physical characteristics | |
| Dimensions | 6.27 km(calculated)[3] 7.195±0.299 km[4][5] |
| 4.5312±0.0090h(R)[6] 4.550±0.020 h(R)[7] 4.5553±0.0090 h(R)[6] | |
| 0.149±0.032[4][5] 0.20(assumed)[3] | |
| S[3] | |
| 12.91±0.24[8] · 13.080±0.160(R)[7] · 13.114±0.002(R)[6] · 13.2[1] · 13.38[3] · 13.4[4] | |
4090 Říšehvězd, provisional designation1986 RH1, is a stonyasteroid from the inner regions of theasteroid belt, approximately 7 kilometers in diameter.
It was discovered by Czech astronomerAntonín Mrkos atKleť Observatory on 2 September 1986. Named for the astronomy journalŘíše hvězd, it is known as having had the mostdiacritics in its name among allnamed minor planets before the naming of229762 Gǃkúnǁʼhòmdímà.[2][9]
TheS-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 aneccentricity of 0.21 and aninclination of 1° with respect to theecliptic.[1] The first observation was made at the U.S.Yerkes Observatory in 1931, extending the asteroid'sobservation arc by 55 years prior to its official discovery.[9]
In 2009 and 2014, several rotationallightcurves were obtained for this asteroid at thePalomar Transient Factory. They gave a concurringrotation period between 4.53 and 4.56 hours with a brightness variation between 0.32 and 0.41magnitude (U=2/2/2).[6][7]
According to the survey carried out by theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer, the asteroid measures 7.2 kilometers in diameter and its surface has analbedo of 0.149,[4][5] while theCollaborative 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.[3]
Thisminor planet was named after the periodically released Czech popularastronomy journal Říše hvězd ("the realm of stars"), which was initially published by the Czech Astronomical Society.[2]
Říše hvězd 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 byJana Tichá,Miloš Tichý andZdeněk Moravec.[2] Naming citation was published on 28 August 1996 (M.P.C. 27734).[10]
