1271 Isergina

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1271 Isergina
Discovery [1]
Discovered by G. Neujmin
Discovery site Simeiz Obs.
Discovery date 10 October 1931
MPC designation (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 3.5228 AU
Perihelion 2.7708 AU
3.1468 AU
Eccentricity 0.1195
5.58 yr (2,039 days)
0° 10m 35.76s / day
Inclination 6.6687°
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±0.00009 h[10]
7.829±0.002 h[11]
9.864±0.004 h[12]
0.0677 (derived)[3]
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 designation 1931 TN, is a carbonaceous background asteroid from the outer regions of the asteroid belt, approximately 45 kilometers in diameter. It was discovered on 10 October 1931, by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula.[15] The asteroid was named after Crimean physician and friend of the discoverer, Pyotr Isergin.[2]

Orbit and classification[edit]

Isergina is a non-family asteroid from the main belt's background population.[4] It orbits the Sun in the outer 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 an eccentricity of 0.12 and an inclination of 7° with respect to the ecliptic.[1]

The asteroid was first identified as A906 HD at Heidelberg Observatory in April 1906. The body's observation arc begins at Simeiz with its official discovery observation in 1931.[15]

Physical characteristics[edit]

In the SMASS classification, Isergina is a carbonaceous C-type asteroid.[1][3] It has also been characterized as both an X- and L-type by Pan-STARRS photometric survey.[14]

Rotation period[edit]

During 2016–2017, three rotational lightcurves of Isergina were obtained from photometric observations (U=3-/3-/2+).[10][11][12] Lightcurve analysis of the adopted result gave a rotation period of 7.59932 hours with a brightness amplitude between 0.25 and 0.36 magnitude (U=3-).[3]

Diameter and albedo[edit]

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Isergina measures between 39.58 and 52.15 kilometers in diameter and its surface has an albedo between 0.031 and 0.08.[5][6][7][8][9][13]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0677 and a diameter of 44.47 kilometers based on an absolute magnitude of 10.3.[3]


This minor planet was named after Crimean physician Pyotr Vasilyevich Isergin (1870–1936), a friend of the discoverer who was treated by him. The author of the Dictionary of Minor Planet Names learned about the naming circumstances from Crimean astronomers I. I. Neyachenko and Galina Kastel' (see 3982 Kastel'). The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 117).[2]


  1. ^ a b c d e f "JPL Small-Body Database Browser: 1271 Isergina (1931 TN)" (2017-07-05 last obs.). Jet Propulsion Laboratory. Retrieved 5 December 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1271) Isergina. Springer Berlin Heidelberg. p. 105. ISBN 978-3-540-00238-3. Retrieved 5 December 2017.
  3. ^ a b c d e f g h "LCDB Data for (1271) Isergina". Asteroid Lightcurve Database (LCDB). Retrieved 5 December 2017.
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 5 December 2017.
  5. ^ a b c d Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 5 December 2017.
  6. ^ a b c d Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 5 December 2017.
  7. ^ a b c d e 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. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 5 December 2017.
  8. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 5 December 2017.
  9. ^ 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. Retrieved 5 December 2017.
  10. ^ a b Benishek, Vladimir (October 2016). "Lightcurves and Rotation Periods for 14 Asteroids". The Minor Planet Bulletin. 43 (4): 339–342. Bibcode:2016MPBu...43..339B. ISSN 1052-8091. Retrieved 5 December 2017.
  11. ^ a b Aznar Macias, Amadeo; Carreno Garcerain, Alfonso; Arce Masego, Enrique; Brines Rodriguez, Pedro; Lozano de Haro, Juan; Fornas Silva, Alvaro; et al. (July 2016). "Twenty-one Asteroid Lightcurves at Group Observadores de Asteroides (OBAS): Late 2015 to Early 2016". The Minor Planet Bulletin. 43 (3): 257–263. Bibcode:2016MPBu...43..257A. ISSN 1052-8091. Retrieved 5 December 2017.
  12. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1271) Isergina". Geneva Observatory. Retrieved 5 December 2017.
  13. ^ a b 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" (PDF). The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 5 December 2017.
  14. ^ a b c 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. Retrieved 5 December 2017.
  15. ^ a b "1271 Isergina (1931 TN)". Minor Planet Center. Retrieved 5 December 2017.

External links[edit]