| Discovery[1] | |
|---|---|
| Discovered by | P. Pravec |
| Discovery site | Ondřejov Obs. |
| Discovery date | 3 April 1995 |
| Designations | |
| (7204) Ondřejov | |
Named after | Ondřejov (town and observatory)[2] |
| 1995 GH · 1980 WM3 | |
| main-belt · (middle)[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 36.42 yr (13,303 days) |
| Aphelion | 2.9941AU |
| Perihelion | 2.3461 AU |
| 2.6701 AU | |
| Eccentricity | 0.1213 |
| 4.36yr (1,594 days) | |
| 168.03° | |
| 0° 13m 33.24s / day | |
| Inclination | 4.8597° |
| 172.33° | |
| 235.90° | |
| Physical characteristics | |
| Dimensions | 5.685±0.163 km[4][5] 6.25 km(calculated)[3] |
| 5.2334±0.0101h[6] | |
| 0.10(assumed)[3] 0.181±0.009[4][5] | |
| S[3] | |
| 13.8[1] · 13.7[4] · 13.687±0.005(R)[6] · 13.67±0.19[7] · 14.14[3] | |
7204 Ondřejov, provisional designation1995 GH, is a stonyasteroid from the middle region of theasteroid belt, approximately 6 kilometers in diameter. It was discovered on 3 April 1995, by Czech astronomerPetr Pravec atOndřejov Observatory near Prague, Czech Republic.[8]
This asteroid was the observatory's first numbered minor planet discovery.[2] It was named for the Czech village ofOndřejov and its discovering observatory.
Ondřejov orbits the Sun in thecentral main-belt at a distance of 2.3–3.0 AU once every 4 years and 4 months (1,594 days). Its orbit has aneccentricity of 0.12 and aninclination of 5° with respect to theecliptic.[1] It was first identified as1980 WM3 atPalomar Observatory in 1980, extending the body'sobservation arc by 15 years prior to its official discovery observation at Ondrejov.[8]
In December 2011, a rotationallightcurve ofOndřejov was obtained fromphotometric observations taken at thePalomar Transient Factory in California. It showed arotation period of5.2334 hours with a brightness variation of 0.55magnitude (U=2).[6]
According to the survey carried out by theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer, the asteroid measures 5.9 kilometers in diameter and its surface has analbedo of 0.18,[4][5] while theCollaborative Asteroid Lightcurve Link assumes a lower albedo of 0.10 and calculates a diameter of 6.3 kilometers with anabsolute magnitude of 14.14.[3]
Thisminor planet was named for both, the Czech village ofOndřejov, and its discovering Ondřejov Observatory, founded in 1898.[2]
Ondřejov is the Czech Republic's oldest astronomical observatory still in use. In 1953, the observatory was integrated into theAstronomical Institute and is now also owned by theAcademy of Sciences of the Czech Republic. Ondřejov is located about 35 kilometers southeast of the country's capital, Prague.[2] The approved naming citation was published by theMinor Planet Center on 22 February 1997 (M.P.C. 29149).[9]
