Astronomy:2036 Sheragul

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2036 Sheragul
Discovery [1]
Discovered byN. Chernykh
Discovery siteCrimea–Nauchnij
Discovery date22 September 1973
Designations
(2036) Sheragul
Named afterSheragul
(Siberian village)[2]
1973 SY2 · 1929 PN
1929 PP · 1952 FJ1
1956 RN · A915 HC
Minor planet categorymain-belt · Flora [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc87.14 yr (31,829 days)
|{{{apsis}}}|helion}}2.6601 AU
|{{{apsis}}}|helion}}1.8296 AU
2.2449 AU
Eccentricity0.1850
Orbital period3.36 yr (1,229 days)
Mean anomaly84.005°
Mean motion0° 17m 34.8s / day
Inclination3.9724°
Longitude of ascending node346.26°
306.35°
Physical characteristics
Dimensions6.80±0.41 km[4]
6.988±0.080 km[5]
7.00±0.50 km[6]
7.241±0.031 km[7]
7.47 km (calculated)[3]
Rotation period5.41±0.01 h[8]
5.413±0.001 h[9]
5.4203±0.0003 h[10]
5.42026±0.00015 h[11]
5.45±0.05 h[12]
Geometric albedo0.24 (assumed)[3]
0.300±0.044[6]
0.318±0.036[4][5]
0.3383±0.0348[7]
A [13] · S [3]
Absolute magnitude (H)12.5[7] · 12.70[4][6] · 12.8[1][3] · 12.92±0.27[13]


2036 Sheragul, provisional designation 1973 SY2, is a rare-type Florian asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. The asteroid was discovered on 22 September 1973, by Soviet astronomer Nikolai Chernykh at the Crimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula.[14] It was named after the Russian village of Sheragul in eastern Siberia.[2]

Orbit and classification

Sheragul is a member of the Flora family, one of the largest collisional populations of stony asteroids. It orbits the Sun in the inner main-belt at a distance of 1.8–2.7 AU once every 3 years and 4 months (1,229 days). Its orbit has an eccentricity of 0.19 and an inclination of 4° with respect to the ecliptic.[1]

In April 1915, it was first identified as A915 HC at the Hamburg Observatory in Germany. The body's observation arc begins 44 years prior to its official discovery observations, with its identifications 1929 PN and 1929 PP at Johannesburg Observatory in August 1929.[14]

Physical characteristics

Sheragul has been characterized as a rare A-type asteroid by Pan-STARRS photometric survey.[13]

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, Sheragul measures between 6.80 and 7.241 kilometers in diameter and its surface has an albedo between 0.300 and 0.3383.[4][5][6][7]

The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the largest member and namesake of its family – and subsequently calculates a larger diameter of 7.47 kilometers based on an absolute magnitude of 12.8.[3]

Lightcurves and poles

Between 2003 and 2014, a large number of rotational lightcurve of Sheragul were obtained from photometric observations by astronomer Maurice Clark at Rosemary Hill Observatory in Florida, and Preston Gott Observatory in Texas, respectively. Lightcurve analysis gave a rotation period of 5.4130 hours with a brightness variation of 0.58 magnitude ({{{1}}}).[8][9][10][11]

The asteroid was also observed during an international study of Florian asteroids by European astronomers in October 2007. It gave a concurring period of 5.45 hours with an exceptionally high amplitude of 1.5 magnitude, indicating the body has a non-spheroidal shape ({{{1}}}).[12]

Based on his many photometric observations, astronomer Maurice Clark also modeled the shape of Sheragul and obtained two spin axis with (306.0°, −35.8°) and (117.3°, −28.9°) in ecliptic coordinates (λ, β), respectively ({{{1}}}). His observations also suggest that the asteroid is in a retrograde rotation.[10]

Naming

This minor planet was named after the Russian village of Sheragul in Irkutsk Oblast, southeastern Siberia, approximately 400 kilometers northwest of Lake Baikal. The name also honors the people of this village, where Nikolai Chernykh spent his school years.[2] The official naming citation was published by the Minor Planet Center on 1 September 1978 (M.P.C. 4482).[15]

References

  1. ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 2036 Sheragul (1973 SY2)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002036. Retrieved 28 June 2017. 
  2. ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(2036) Sheragul". Dictionary of Minor Planet Names – (2036) Sheragul. Springer Berlin Heidelberg. p. 165. doi:10.1007/978-3-540-29925-7_2037. ISBN 978-3-540-00238-3. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 "LCDB Data for (2036) Sheragul". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=2036%7CSheragul. Retrieved 28 June 2017. 
  4. ↑ 4.0 4.1 4.2 4.3 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C. et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters 759 (1): 5. doi:10.1088/2041-8205/759/1/L8. Bibcode: 2012ApJ...759L...8M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M. Retrieved 28 June 2017. 
  5. ↑ 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 28 June 2017. 
  6. ↑ 6.0 6.1 6.2 6.3 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)
  7. ↑ 7.0 7.1 7.2 7.3 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. 
  8. ↑ 8.0 8.1 Clark, Maurice (March 2004). "Rosemary Hill Observatory photometry of asteroids 2036 Sheragul and (21652) 1999 OQ2". The Minor Planet Bulletin 31 (1): 15–16. ISSN 1052-8091. Bibcode: 2004MPBu...31...15C. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2004MPBu...31...15C. Retrieved 28 June 2017. 
  9. ↑ 9.0 9.1 Clark, Maurice (October 2011). "Asteroid Lightcurves from the Preston Gott and McDonald Observatories". The Minor Planet Bulletin 38 (4): 187–189. ISSN 1052-8091. Bibcode: 2011MPBu...38..187C. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011MPBu...38..187C. Retrieved 28 June 2017. 
  10. ↑ 10.0 10.1 10.2 Clark, Maurice (January 2016). "Shape Modelling of Asteroids 1708 Polit, 2036 Sheragul, and 3015 Candy". The Minor Planet Bulletin 43 (1): 80–86. ISSN 1052-8091. Bibcode: 2016MPBu...43...80C. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016MPBu...43...80C. Retrieved 28 June 2017. 
  11. ↑ 11.0 11.1 Clark, Maurice (July 2015). "Asteroid Photometry from the Preston Gott Observatory". The Minor Planet Bulletin 42 (3): 163–166. ISSN 1052-8091. Bibcode: 2015MPBu...42..163C. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015MPBu...42..163C. Retrieved 28 June 2017. 
  12. ↑ 12.0 12.1 Kryszczynska, A.; Colas, F.; Polinska, M.; Hirsch, R.; Ivanova, V.; Apostolovska, G. et al. (October 2012). "Do Slivan states exist in the Flora family?. I. Photometric survey of the Flora region". Astronomy and Astrophysics 546: 51. doi:10.1051/0004-6361/201219199. Bibcode: 2012A&A...546A..72K. https://hal.archives-ouvertes.fr/hal-03123875/file/aa19199-12.pdf. Retrieved 28 June 2017. 
  13. ↑ 13.0 13.1 13.2 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 28 June 2017. 
  14. ↑ 14.0 14.1 "2036 Sheragul (1973 SY2)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=2036. Retrieved 28 June 2017. 
  15. ↑ Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7. https://archive.org/details/dictionaryminorp2008schm. 

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