Astronomy:2122 Pyatiletka
| Discovery [1] | |
|---|---|
| Discovered by | T. Smirnova |
| Discovery site | Crimean Astrophysical Obs. |
| Discovery date | 14 December 1971 |
| Designations | |
| (2122) Pyatiletka | |
| Named after | Pyatiletka (Five-year plans of the USSR)[2] |
| 1971 XB · 1950 BE1 1950 DX · 1951 KB1 1954 DA · 1961 AL 1969 EV1 | |
| Minor planet category | main-belt · (inner) [3] |
| Orbital characteristics [1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 63.18 yr (23,075 days) |
| |{{{apsis}}}|helion}} | 2.4729 AU |
| |{{{apsis}}}|helion}} | 2.3310 AU |
| 2.4019 AU | |
| Eccentricity | 0.0295 |
| Orbital period | 3.72 yr (1,360 days) |
| Mean anomaly | 197.74° |
| Mean motion | 0° 15m 53.28s / day |
| Inclination | 7.8981° |
| Longitude of ascending node | 105.50° |
| 236.47° | |
| Physical characteristics | |
| Dimensions | 10.75 km (calculated)[3] 11.00±0.83 km[4] 11.084±0.101 km[5] 11.554±0.074 km[6] |
| Rotation period | 8.899±0.0053 h[7] |
| Geometric albedo | 0.1931±0.0198[6] 0.20 (assumed)[3] 0.211±0.033[4] 0.224±0.023[5] |
| S [3] | |
| Absolute magnitude (H) | 11.759±0.002 (R)[7] · 12.1[1][4][6] · 12.21[3] · 12.40±0.29[8] |
2122 Pyatiletka, provisional designation 1971 XB, is a stony asteroid from the inner regions of the asteroid belt, approximately 11 kilometers in diameter.
The asteroid was discovered on 14 December 1971 by Soviet astronomer Tamara Smirnova at the Crimean Astrophysical Observatory in Nauchnyj, on the Crimean peninsula.[9] It was named for "pyatiletka", the first Five-Year Plan of the USSR.[2]
Orbit and classification
Pyatiletka orbits the Sun in the inner main-belt at a distance of 2.3–2.5 AU once every 3 years and 9 months (1,360 days). Its orbit has an eccentricity of 0.03 and an inclination of 8° with respect to the ecliptic.[1]
It was first identified as 1950 BE1 at Simeiz Observatory in 1950. The body's observation arc begins at Lowell Observatory in 1961, when it was identified as 1961 AL, 10 years prior to its official discovery observation at Nauchnyj.[9]
Physical characteristics
Pyatiletka has been characterized as a stony S-type asteroid.[3]
Lightcurves
A fragmentary rotational lightcurve of Pyatiletka was obtained from photometric observations at the Palomar Transient Factory in California in February 2010. Lightcurve analysis gave a tentative rotation period of 8.899 hours with a brightness variation of 0.10 magnitude ({{{1}}}).[7] As of 2017, no other lightcurve has been published.[3]
Diameter and albedo
According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Pyatiletka measures between 11.00 and 11.55 kilometers in diameter, and its surface has an albedo between 0.1931 and 0.224.[4][5][6] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 10.75 kilometers with an absolute magnitude of 12.21.[3]
Naming
This minor planet was named in honor of the five-year plans of the Soviet Union on the occasion of the 50th anniversary of its first adoption.[2] The official naming citation was published by the Minor Planet Center on 1 April 1980 (M.P.C. 5283).[10]
References
- ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 2122 Pyatiletka (1971 XB)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002122. Retrieved 11 June 2017.
- ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(2122) Pyatiletka". Dictionary of Minor Planet Names – (2122) Pyatiletka. Springer Berlin Heidelberg. p. 172. doi:10.1007/978-3-540-29925-7_2123. ISBN 978-3-540-00238-3.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 "LCDB Data for (2122) Pyatiletka". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=2122%7CPyatiletka. Retrieved 27 March 2017.
- ↑ 4.0 4.1 4.2 4.3 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. doi:10.1093/pasj/63.5.1117. Bibcode: 2011PASJ...63.1117U. (online, AcuA catalog p. 153)
- ↑ 5.0 5.1 5.2 Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R. et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal 791 (2): 11. doi:10.1088/0004-637X/791/2/121. Bibcode: 2014ApJ...791..121M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M. Retrieved 27 March 2017.
- ↑ 6.0 6.1 6.2 6.3 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D. et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal 741 (2): 25. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M.
- ↑ 7.0 7.1 7.2 Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal 150 (3): 35. doi:10.1088/0004-6256/150/3/75. Bibcode: 2015AJ....150...75W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015AJ....150...75W. Retrieved 27 March 2017.
- ↑ 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. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V. Retrieved 27 March 2017.
- ↑ 9.0 9.1 "2122 Pyatiletka (1971 XB)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=2122. Retrieved 27 March 2017.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. Retrieved 27 March 2017.
External links
- Asteroid Lightcurve Database (LCDB), query form (info )
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 2122 Pyatiletka at AstDyS-2, Asteroids—Dynamic Site
- 2122 Pyatiletka at the JPL Small-Body Database
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