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1004 Belopolskya

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Discovered by  S. Belyavskyj
MPC designation  1004 Belopolskya
Discovered  5 September 1923
Discoverer  Sergey Belyavsky
Discovery site  Simeiz Observatory
Discovery date  5 September 1923
Observation arc  92.89 yr (33,928 days)
Orbits  Sun
Named after  Aristarkh Belopolsky
Asteroid group  Cybele asteroid
Alternative names  1923 OS · 1936 WB 1937 YB · 1938 AA 1963 DC · 1974 WK 2004 SU12 · A917 TA
Minor planet category  main-belt · (outer)  · Cybele
Similar  1002 Olbersia, 1001 Gaussia, 1056 Azalea, 1102 Pepita, 441 Bathilde

1004 Belopolskya, provisional designation 1923 OS, is a dark Cybele asteroid from the outermost region of the asteroid belt, approximately 75 kilometers in diameter. It was discovered on 5 September 1923, by Russian astronomer Sergey Belyavsky at Simeiz Observatory on the Crimean peninsula. Eight nights later, the body was independently discovered by Karl Reinmuth at Heidelberg in Germany. It is named for Russian astrophysicist Aristarkh Belopolsky.


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 an eccentricity of 0.09 and an inclination of 3° with respect to the ecliptic. With these orbital parameters, it belongs to the Cybele asteroids, a collisional family named after one of the largest asteroids, 65 Cybele. It was first identified as A917 TA at Simeiz in 1917. The body's observation arc begins with the above mentioned Heidelberg-observation following its official discovery.

According to the surveys carried out by the Infrared Astronomical Satellite IRAS and the Japanese Akari satellite, Belopolskya measures 71.60 and 79.83 kilometers in diameter, and its surface has an albedo of 0.0348 and 0.028, respectively. The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS. It is classified as a PF-type asteroid in the Tholen taxonomy, a subtype of the dark and reddish P-type asteroids. A few dozens of these bodies are known, most of them are Jupiter trojans or reside in the outermost main-belt.

A rotational lightcurve of Belopolskya, obtained by Italian amateur astronomer Silvano Casulli in July 2010, gave a rotation period of 9.44 hours with a brightness variation of 0.14 magnitude (U=2). No other lightcurves have been obtained.

This minor planet was named in honor of Aristarkh Belopolsky (1854–1934), astrophysicist at Pulkovo 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 crater Belopol'skiy. Naming citation was first mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 96).


1004 Belopolskya Wikipedia