| Discovery[1] | |
|---|---|
| Discovered by | G. Neujmin |
| Discovery site | Simeiz Obs. |
| Discovery date | 10 October 1931 |
| Designations | |
| (1271) Isergina | |
Named after | Pyotr Vasilyevich Isergin[2] (Crimean physician) |
| 1931 TN · 1930 MK 1932 CK1 · 2003 RV22 A906 HD | |
| main-belt · (outer)[3] background[4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 111.22 yr (40,622 days) |
| Aphelion | 3.5228AU |
| Perihelion | 2.7708 AU |
| 3.1468 AU | |
| Eccentricity | 0.1195 |
| 5.58yr (2,039 days) | |
| 160.82° | |
| 0° 10m 35.76s / day | |
| Inclination | 6.6687° |
| 127.22° | |
| 269.37° | |
| Physical characteristics | |
| Dimensions | 39.58±12.78 km[5] 42.32±14.32 km[6] 44.47 km(derived)[3] 47.52±0.38 km[7] 47.524±0.383 km[7] 50.897±0.464 km[8] 52.15±0.76 km[9] |
| 7.59932±0.00009h[10] 7.829±0.002 h[11] 9.864±0.004 h[12] | |
| 0.031±0.003[13] 0.038±0.001[9] 0.0392±0.0102[8] 0.06±0.06[6] 0.065±0.009[7] 0.0677(derived)[3] 0.08±0.08[5] | |
| SMASS =C[1][3] · X/L[14] | |
| 10.20[7] · 10.30[3][6] · 10.39±0.20[14] · 10.4[1] · 10.42[5] · 10.60[8][9] | |
1271 Isergina, provisional designation1931 TN, is a carbonaceous backgroundasteroid from the outer regions of theasteroid belt, approximately 45 kilometers in diameter. It was discovered on 10 October 1931, by Soviet astronomerGrigory Neujmin at theSimeiz Observatory on the Crimean peninsula.[15] The asteroid was named after Crimean physician and friend of the discoverer, Pyotr Isergin.[2]
Isergina is a non-family asteroid from the main belt'sbackground population.[4] It orbits the Sun in theouter asteroid belt at a distance of 2.8–3.5 AU once every 5 years and 7 months (2,039 days;semi-major axis of 3.15 AU). Its orbit has aneccentricity of 0.12 and aninclination of 7° with respect to theecliptic.[1]
The asteroid was first identified asA906 HD atHeidelberg Observatory in April 1906. The body'sobservation arc begins at Simeiz with its official discovery observation in 1931.[15]
In theSMASS classification,Isergina is a carbonaceousC-type asteroid.[1][3] It has also been characterized as both anX- andL-type byPan-STARRS photometric survey.[14]
During 2016–2017, three rotationallightcurves ofIsergina were obtained from photometric observations (U=3-/3-/2+).[10][11][12] Lightcurve analysis of the adopted result gave arotation period of 7.59932 hours with a brightness amplitude between 0.25 and 0.36magnitude (U=3-).[3]
According to the surveys carried out by the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Isergina measures between 39.58 and 52.15 kilometers in diameter and its surface has analbedo between 0.031 and 0.08.[5][6][7][8][9][13]
TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.0677 and a diameter of 44.47 kilometers based on anabsolute magnitude of 10.3.[3]
Thisminor planet was named after Crimean physician Pyotr Vasilyevich Isergin (1870–1936), a friend of the discoverer who was treated by him. The author of theDictionary of Minor Planet Names learned about the naming circumstances from Crimean astronomers I. I. Neyachenko andGalina Kastelʹ(see3982 Kastelʹ). The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 117).[2]
