2139 Makharadze

2139 Makharadze, provisional designation 1970 MC, is a rare-type Nysa asteroid from the inner region of the asteroid belt, approximately 14 kilometres (8.7 mi) in diameter. It was discovered on 30 June 1970, by Russian astronomer Tamara Smirnova at the Crimean Astrophysical Observatory in Nauchnyj.^[5]

2139 Makharadze

Discovery[1]
Discovered by	T. Smirnova
Discovery site	Crimean Astrophysical Obs.
Discovery date	30 June 1970
Designations
MPC designation	(2139) Makharadze
Named after	Ozurgeti (Georgian city)[2]
Alternative designations	1970 MC · 1928 TF 1955 SS1 · 1955 UA1 1970 PJ · 1974 QN 1977 ER1 · A924 RB
Minor planet category	main-belt · Nysa[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	91.98 yr (33,594 days)
Aphelion	2.9242 AU
Perihelion	1.9997 AU
Semi-major axis	2.4619 AU
Eccentricity	0.1878
Orbital period (sidereal)	3.86 yr (1,411 days)
Mean anomaly	54.791°
Mean motion	0° 15m 18.36s / day
Inclination	2.1801°
Longitude of ascending node	256.16°
Argument of perihelion	67.561°
Physical characteristics
Dimensions	8 km (calculated)[3] 17.240±0.092 km[4]
Synodic rotation period	11.9759 h[3]
Geometric albedo	0.045±0.007[4]
Spectral type	Tholen = F[1] · F[3] B–V = 0.653[1] U–B = 0.231[1]
Absolute magnitude (H)	12.80[1][3]

Orbit and classification

Makharadze belongs to the Nysa family of asteroids. It orbits the Sun in the inner main-belt at a distance of 2.0–2.9 AU once every 3 years and 10 months (1,411 days). Its orbit has an eccentricity of 0.19 and an inclination of 2° with respect to the ecliptic.^[1]

Physical characteristics

In the Tholen classification, Makharadze is a F-type asteroid.^[1] It has a rotation period of 11.9759 hours with a brightness variation of 0.38 magnitude.^[3]

Naming

This minor planet was named after the Georgian city of Ozurgeti, formerly known as Makharadze. Makharadze is the twin city of Genichesk, Tamara Smirnova's Ukrainian birthplace.^[2] The approved naming citation was published on 8 February 1982 (M.P.C. 6647).^[6]