| Discovery[1] | |
|---|---|
| Discovered by | S. Belyavskyj |
| Discovery site | Simeiz Obs. |
| Discovery date | 5 September 1923 |
| Designations | |
| (1004) Belopolskya | |
Named after | Aristarkh Belopolsky (astrophysicist)[2] |
| 1923 OS · 1936 WB 1937 YB · 1938 AA 1963 DC · 1974 WK 2004 SU12 · A917 TA | |
| main-belt · (outer)[3] · Cybele | |
| Orbital characteristics[1] | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 92.89 yr (33,928 days) |
| Aphelion | 3.6994AU |
| Perihelion | 3.1054 AU |
| 3.4024 AU | |
| Eccentricity | 0.0873 |
| 6.28yr (2,292 days) | |
| 322.58° | |
| 0° 9m 25.2s / day | |
| Inclination | 2.9787° |
| 153.54° | |
| 215.17° | |
| Physical characteristics | |
| Dimensions | 71.60±2.1 km(IRAS:9)[4] 79.83±1.33 km[5] |
| 9.44±0.01h[6] | |
| 0.028±0.001[5] 0.0348±0.002(IRAS:9)[4] | |
| B–V = 0.720[1] U–B = 0.120[1] Tholen = PC[1] · PC[3] | |
| 9.99[1][3][5] · 10.02±0.29[7] | |
Belopolskya (minor planet designation:1004 Belopolskya), provisional designation1923 OS, is a dark Cybeleasteroid from the outermost region of theasteroid belt, approximately 75 kilometers (47 mi) in diameter. It was named for Russian astrophysicistAristarkh Belopolsky.
Belopolskya was discovered on 5 September 1923, by Russian astronomerSergey Belyavsky atSimeiz Observatory on the Crimean peninsula.[8] Eight nights later, the body was independently discovered byKarl Reinmuth atHeidelberg in Germany.[2]
It was first identified asA917 TA at Simeiz in 1917. The body'sobservation arc begins with the above-mentioned Heidelberg-observation following its official discovery.[8]
Belopolskya orbits the Sun at a distance of 3.1–3.7 AU once every 6 years and 3 months (2,292 days). Its orbit has aneccentricity of 0.09 and aninclination of 3° with respect to theecliptic.[1] With these orbital parameters, it belongs to theCybele asteroids, a dynamical group named after one of the largest asteroids,65 Cybele.
Belopolskya is classified as a PF-type asteroid in theTholen taxonomy, a subtype of the dark and reddishP-type asteroids. A few dozens of these bodies are known, most of them are Jupiter trojans or reside in the outermost main-belt.[9]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS and the JapaneseAkari satellite,Belopolskya measures 71.60 and 79.83 kilometers in diameter, and its surface has analbedo of 0.0348 and 0.028, respectively.[4][5] TheCollaborative Asteroid Lightcurve Link adopts the shorter diameter obtained by IRAS.[3]
A rotationallightcurve ofBelopolskya, obtained by Italian amateur astronomerSilvano Casulli in July 2010, gave arotation period of 9.44 hours with a brightness variation of 0.14magnitude (U=2).[6] No other lightcurves have been obtained.
Thisminor planet was named in honor ofAristarkh Belopolsky (1854–1934), astrophysicist atPulkovo Observatory, the principal astronomical observatory of the Russian Academy of Sciences, which is located south of Saint Petersburg in Russia. Belopolsky is also honored by the lunar craterBelopol'skiy.[2] Naming citation was first mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 96).[2]
