1889 Pakhmutova

1889 Pakhmutova, provisional designation 1968 BE, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 35 kilometers in diameter.

1889 Pakhmutova

Lightcurve-based 3D-model of Pakhmutova
Discovery[1]
Discovered by	L. Chernykh
Discovery site	Crimean Astrophysical Obs.
Discovery date	24 January 1968
Designations
MPC designation	(1889) Pakhmutova
Named after	Aleksandra Pakhmutova (Russian composer)[2]
Alternative designations	1968 BE · 1942 JM 1966 US · 1969 JM
Minor planet category	main-belt · (outer)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	50.53 yr (18,455 days)
Aphelion	3.4349 AU
Perihelion	2.7452 AU
Semi-major axis	3.0901 AU
Eccentricity	0.1116
Orbital period (sidereal)	5.43 yr (1,984 days)
Mean anomaly	33.156°
Mean motion	0° 10m 53.04s / day
Inclination	13.183°
Longitude of ascending node	55.153°
Argument of perihelion	84.606°
Physical characteristics
Dimensions	33.41 km (derived)[3] 33.53±1.8 km[4] 35.24±0.63 km[5] 35.45±10.87 km[6] 37.47±0.84 km[7] 37.68±14.19 km[8]
Synodic rotation period	17.490±0.004 h[9][a] 17.5157±0.0005 h[10] 17.5226±0.0113 h[11]
Geometric albedo	0.05±0.04[8] 0.057±0.013[5] 0.0574 (derived)[3] 0.06±0.09[6] 0.061±0.003[7] 0.0752±0.009[4]
Spectral type	C[3]
Absolute magnitude (H)	10.80[4][7] · 10.969±0.002 (R)[11] · 11.0[5][8] · 11.1[1][3] · 11.12[6] · 11.29±0.37[12]

It was discovered by Russian astronomer Lyudmila Chernykh at the Crimean Astrophysical Observatory in Nauchnyj on 24 January 1968.^[13] The asteroid was named after Russian composer Aleksandra Pakhmutova.^[2]

Orbit and classification

Pakhmutova orbits the Sun in the outer main-belt at a distance of 2.7–3.4 AU once every 5 years and 5 months (1,984 days). Its orbit has an eccentricity of 0.11 and an inclination of 13° with respect to the ecliptic.^[1] It was first identified as 1942 JM at Johannesburg Observatory in 1942. Its first used observation was made in 1968, when it was identified as 1966 US at the discovering observatory, extending the body's observation arc by 2 years prior to its official discovery observation.^[13]

Physical characteristics

Pakhmutova has been characterized as a carbonaceous C-type asteroid.^[3]

Diameter and albedo

This asteroid has a mean-diameter between 33.53 and 37.68 kilometers, and an albedo between 0.05 and 0.0752, as measured by the space-based Akari, IRAS and WISE/NEOWISE surveys.^{[4][5][6][7][8]} The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0574 and a diameter of 33.41 kilometers with an absolute magnitude of 11.1.^[3]

Rotation period and poles

In February 2006, a rotational lightcurve^[a] was obtained by American astronomer Brian Warner at his Palmer Divide Observatory (716) in Colorado. Lightcurve analysis gave a rotation period of 17.490 hours with a brightness variation of 0.50 in magnitude (U=3-).^[9] Photometric observations at the Palomar Transient Factory in February 2012, gave a period of 17.5226 hours and an amplitude of 0.49 magnitude (U=2).^[11]

In 2011, a modeled lightcurve using data from the Uppsala Asteroid Photometric Catalogue (UAPC) and other sources gave a period 17.5157 hours, as well as a spin axis of (22.0°, –76.0°; 167.0°, –40.0°) in ecliptic coordinates (λ, β) (U=2).^[10]

Naming

This minor planet was named in honor of the Russian composer Aleksandra Pakhmutova, one of the best known figures in Soviet and later Russian popular music.^[2] The official naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3936).^[14]

Notes

1. Lightcurve plot of 1889 Pakhmutova with a rotation period 17.490±0.004 hours with a brightness amplitude of 0.50±0.02 by B. D. Warner at the Palmer Divide Observatory (2006). Summary figures at LCDB