1004 Belopolskya

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1004 Belopolskya
Discovered byS. Belyavskyj
Discovery siteSimeiz Obs.
Discovery date5 September 1923
(1004) Belopolskya
Named after
Aristarkh Belopolsky
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 arc92.89 yr (33,928 days)
Aphelion3.6994 AU
Perihelion3.1054 AU
3.4024 AU
6.28 yr (2,292 days)
0° 9m 25.2s / day
Physical characteristics
Dimensions71.60±2.1 km (IRAS:9)[4]
79.83±1.33 km[5]
9.44±0.01 h[6]
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 designation 1923 OS, is a dark Cybele asteroid from the outermost region of the asteroid belt, approximately 75 kilometers (47 mi) in diameter. It was named for Russian astrophysicist Aristarkh Belopolsky.


Belopolskya was discovered on 5 September 1923, by Russian astronomer Sergey Belyavsky at Simeiz Observatory on the Crimean peninsula.[8] Eight nights later, the body was independently discovered by Karl Reinmuth at Heidelberg in Germany.[2]

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.[8]

Classification and orbit[edit]

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.[1] With these orbital parameters, it belongs to the Cybele asteroids, a dynamical group named after one of the largest asteroids, 65 Cybele.

Physical characteristics[edit]

Belopolskya 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.[9]

Diameter and albedo[edit]

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.[4][5] The Collaborative Asteroid Lightcurve Link adopts the shorter diameter obtained by IRAS.[3]

Rotation period[edit]

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).[6] 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.[2] Naming citation was first mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 96).[2]


  1. ^ a b c d e f g "JPL Small-Body Database Browser: 1004 Belopolskya (1923 OS)" (2016-08-03 last obs.). Jet Propulsion Laboratory. Retrieved 31 January 2017.
  2. ^ a b c d Schmadel, Lutz D. (2007). "(1004) Belopolskya". Dictionary of Minor Planet Names – (1004) Belopolskya. Springer Berlin Heidelberg. p. 87. doi:10.1007/978-3-540-29925-7_1005. ISBN 978-3-540-00238-3.
  3. ^ a b c d "LCDB Data for (1004) Belopolskya". Asteroid Lightcurve Database (LCDB). Retrieved 31 January 2017.
  4. ^ a b c Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
  5. ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
  6. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1004) Belopolskya". Geneva Observatory. Retrieved 31 January 2017.
  7. ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 – Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007.
  8. ^ a b "1004 Belopolskya (1923 OS)". Minor Planet Center. Retrieved 31 January 2017.
  9. ^ "JPL Small-Body Database Search Engine: spec. type = P (Tholen)". JPL Solar System Dynamics. Retrieved 17 June 2015.

External links[edit]