| Discovery[1] | |
|---|---|
| Discovered by | N. Chernykh |
| Discovery site | Crimea–Nauchnij |
| Discovery date | 22 September 1973 |
| Designations | |
| (2036) Sheragul | |
Named after | Sheragul (Siberian village)[2] |
| 1973 SY2 · 1929 PN 1929 PP · 1952 FJ1 1956 RN · A915 HC | |
| main-belt · Flora[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 87.14 yr (31,829 days) |
| Aphelion | 2.6601AU |
| Perihelion | 1.8296 AU |
| 2.2449 AU | |
| Eccentricity | 0.1850 |
| 3.36yr (1,229 days) | |
| 84.005° | |
| 0° 17m 34.8s / day | |
| Inclination | 3.9724° |
| 346.26° | |
| 306.35° | |
| Physical characteristics | |
| Dimensions | 6.80±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] |
| 5.41±0.01h[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] | |
| 0.24(assumed)[3] 0.300±0.044[6] 0.318±0.036[4][5] 0.3383±0.0348[7] | |
| A[13] · S[3] | |
| 12.5[7] · 12.70[4][6] · 12.8[1][3] · 12.92±0.27[13] | |
2036 Sheragul, provisional designation1973 SY2, is a rare-type Florianasteroid from the inner regions of theasteroid belt, approximately 7 kilometers in diameter. The asteroid was discovered on 22 September 1973, by Soviet astronomerNikolai Chernykh at theCrimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula.[14] It was named after the Russian village ofSheragul in easternSiberia.[2]
Sheragul is a member of theFlora family, one of the largest collisional populations ofstony asteroids. It orbits the Sun in theinner main-belt at a distance of 1.8–2.7 AU once every 3 years and 4 months (1,229 days). Its orbit has aneccentricity of 0.19 and aninclination of 4° with respect to theecliptic.[1]
In April 1915, it was first identified asA915 HC at theHamburg Observatory in Germany. The body'sobservation arc begins 44 years prior to its official discovery observations, with its identifications1929 PN and1929 PP atJohannesburg Observatory in August 1929.[14]
Sheragul has been characterized as a rareA-type asteroid byPan-STARRS photometric survey.[13]
According to the surveys carried out by the JapaneseAkari satellite and NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Sheragul measures between 6.80 and 7.241 kilometers in diameter and its surface has analbedo between 0.300 and 0.3383.[4][5][6][7]
TheCollaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from8 Flora, the largest member and namesake of its family – and subsequently calculates a larger diameter of 7.47 kilometers based on anabsolute magnitude of 12.8.[3]
Between 2003 and 2014, a large number of rotationallightcurve ofSheragul were obtained from photometric observations by astronomer Maurice Clark atRosemary Hill Observatory in Florida, and Preston Gott Observatory in Texas, respectively. Lightcurve analysis gave arotation period of 5.4130 hours with a brightness variation of 0.58magnitude (U=3/3/3/3-/3-/3/3).[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 (U=3-).[12]
Based on his many photometric observations, astronomer Maurice Clark also modeled the shape ofSheragul and obtained two spin axis with (306.0°, −35.8°) and (117.3°, −28.9°) inecliptic coordinates (λ, β), respectively (U=3-;Q=1). His observations also suggest that the asteroid is in a retrograde rotation.[10]
Thisminor planet was named after the Russian village of Sheragul inIrkutsk Oblast, southeasternSiberia, approximately 400 kilometers northwest ofLake Baikal. The name also honors the people of this village, whereNikolai Chernykh spent his school years.[2] The officialnaming citation was published by theMinor Planet Center on 1 September 1978 (M.P.C. 4482).[15]
