2892 Filipenko

2892 Filipenko, provisional designation 1983 AX₂, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 60 kilometers in diameter.

2892 Filipenko

Discovery[1]
Discovered by	L. G. Karachkina
Discovery site	Crimean Astrophysical Obs.
Discovery date	13 January 1983
Designations
MPC designation	(2892) Filipenko
Named after	Aleksandr Filipenko (Crimean surgeon)[2]
Alternative designations	1983 AX2 · 1936 QK1 1953 SB · 1953 SL 1955 DO · 1957 KP 1964 PA · A910 CK
Minor planet category	main-belt · (outer)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	63.63 yr (23,242 days)
Aphelion	3.8269 AU
Perihelion	2.5215 AU
Semi-major axis	3.1742 AU
Eccentricity	0.2056
Orbital period (sidereal)	5.66 yr (2,066 days)
Mean anomaly	97.252°
Mean motion	0° 10m 27.48s / day
Inclination	16.956°
Longitude of ascending node	326.54°
Argument of perihelion	91.945°
Physical characteristics
Dimensions	56.08 km (derived)[3] 56.13±1.4 km[4] 57.37±0.93 km[5] 69.492±0.396 km[6]
Synodic rotation period	14.00±0.01 h[7]
Geometric albedo	0.030±0.007[6] 0.0426 (derived)[3] 0.045±0.002[5] 0.0466±0.002[4]
Spectral type	SMASS = C[1] · C[3]
Absolute magnitude (H)	10.02±0.31[8] · 10.20[4][5][6] · 10.3[1][3]

The asteroid was discovered on 13 January 1983, by Russian female astronomer Lyudmila Karachkina at Crimean Astrophysical Observatory in Nauchnyj, on the Crimean peninsula.^[9] It was named after surgeon Aleksandr Filipenko.^[2]

Orbit and classification

Filipenko is a dark asteroid that orbits the Sun in the outer main-belt at a distance of 2.5–3.8 AU once every 5 years and 8 months (2,066 days). Its orbit has an eccentricity of 0.21 and an inclination of 17° with respect to the ecliptic.^[1]

First identified as A910 CK at Taunton Observatory (803) in 1910, Filipenko's first used observation was made at the Finnish Turku Observatory in 1953, extending the body's observation arc by 30 years prior to its official discovery observation at Nauchnyj.^[9]

Physical characteristics

In the SMASS classification, Filipenko has been classified as a carbonaceous C-type asteroid.^[1]

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Filipenko measures between 56.1 and 69.5 kilometers in diameter and its surface has an albedo between 0.030 and 0.046.^[4][5][6] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0426 and a smaller diameter of 56.0 kilometers with an absolute magnitude of 10.3.^[3]

Rotation period

In November 2004, a rotational lightcurve of Filipenko was obtained from photometric observations by Robert D. Stephens at the Santana Observatory (646), California, and gave a well-defined rotation period of 14.00±0.01 hours with a brightness variation of 0.21±0.03 magnitude (U=3).^[7]

Naming

This minor planet is named for Aleksandr Filipenko, chief surgeon at the hospital in Bakhchisarai located on the Crimean peninsula. He had saved the life of a friend of the discoverer Lyudmila Karachkina.^[2] The official naming citation was published by the Minor Planet Center on 13 July 1984 (M.P.C. 8913).^[10]