1271 Isergina

1271 Isergina

Discovery[1]
Discovered by	G. Neujmin
Discovery site	Simeiz Obs.
Discovery date	10 October 1931
Designations
MPC designation	(1271) Isergina
Named after	Pyotr Vasilyevich Isergin[2] (Crimean physician)
Alternative designations	1931 TN · 1930 MK 1932 CK1 · 2003 RV22 A906 HD
Minor planet category	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
Semi-major axis	3.1468 AU
Eccentricity	0.1195
Orbital period (sidereal)	5.58 yr (2,039 days)
Mean anomaly	160.82°
Mean motion	0° 10^m 35.76^s / day
Inclination	6.6687°
Longitude of ascending node	127.22°
Argument of perihelion	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]
Synodic rotation period	7.59932±0.00009 h[10] 7.829±0.002 h[11] 9.864±0.004 h[12]
Geometric albedo	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]
Spectral type	SMASS = C[1][3] · X/L[14]
Absolute magnitude (H)	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

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

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

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

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]

Naming

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 Kastelʹ (see 3982 Kastelʹ). The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 117).[2]

References

1. "JPL Small-Body Database Browser: 1271 Isergina (1931 TN)" (2017-07-05 last obs.). Jet Propulsion Laboratory. Retrieved 5 December 2017.
2. Schmadel, Lutz D. (2007). "(1271) Isergina". Dictionary of Minor Planet Names – (1271) Isergina. Springer Berlin Heidelberg. p. 105. doi:10.1007/978-3-540-29925-7_1272. ISBN 978-3-540-00238-3.
3. "LCDB Data for (1271) Isergina". Asteroid Lightcurve Database (LCDB). Retrieved 5 December 2017.
4. "Asteroid 1271 Isergina – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019.
5. 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.
6. 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. S2CID 9341381. Retrieved 5 December 2017.
7. 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. S2CID 46350317. Retrieved 5 December 2017.
8. 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. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. S2CID 35447010.
9. 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. (online, AcuA catalog p. 153)
10. 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. 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. Behrend, Raoul. "Asteroids and comets rotation curves – (1271) Isergina". Geneva Observatory. Retrieved 5 December 2017.
13. 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. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. S2CID 119293330.
14. 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. S2CID 53493339. Retrieved 5 December 2017.
15. "1271 Isergina (1931 TN)". Minor Planet Center. Retrieved 5 December 2017.

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• 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
• 1271 Isergina at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 1271 Isergina at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters