1979 Sakharov

1979 Sakharov, provisionally designated 2006 P-L, is a stony Vestian asteroid from the inner regions of the asteroid belt, approximately 4.5 kilometers in diameter. It was discovered during the Palomar–Leiden survey in 1960, and named after Russian physicist Andrei Sakharov.

1979 Sakharov

Discovery[1]
Discovered by	C. J. van Houten I. van Houten-G. T. Gehrels
Discovery site	Palomar Obs.
Discovery date	24 September 1960
Designations
MPC designation	(1979) Sakharov
Named after	Andrei Sakharov (Russian physicist)[2]
Alternative designations	2006 P-L · 1971 SQ3 1982 SZ12
Minor planet category	main-belt · Vestian[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	56.60 yr (20,672 days)
Aphelion	2.6125 AU
Perihelion	2.1368 AU
Semi-major axis	2.3747 AU
Eccentricity	0.1002
Orbital period (sidereal)	3.66 yr (1,337 days)
Mean anomaly	157.42°
Mean motion	0° 16m 9.48s / day
Inclination	6.0480°
Longitude of ascending node	202.65°
Argument of perihelion	221.15°
Physical characteristics
Dimensions	4.51 km (taken)[3] 4.512 km[4] 4.760±0.211 km[5][6]
Synodic rotation period	7.5202±0.0003 h[7] 7.5209±0.0002 h[1][a] 7.521±0.005 h[a] 7.589±0.001 h[8]
Geometric albedo	0.262[3][4] 0.3103±0.0450[5] 0.394±0.040[6]
Spectral type	Q-V[9] · S[3]
Absolute magnitude (H)	13.31±0.02 (R)[a] · 13.5[5] · 13.6[1] · 13.67±0.28[9] · 13.8±0.054[4][3]

Discovery

Sakharov was discovered on 24 September 1960, by the Dutch astronomers Ingrid and Cornelis van Houten, on photographic plates taken by Dutch–American astronomer Tom Gehrels at the U.S. Palomar Observatory in California.^[10]

Survey designation

The survey designation "P-L" stands for Palomar–Leiden, named after Palomar Observatory and Leiden Observatory, which collaborated on the fruitful Palomar–Leiden survey in the 1960s. Gehrels used Palomar's Samuel Oschin telescope (also known as the 48-inch Schmidt Telescope), and shipped the photographic plates to Ingrid and Cornelis van Houten at Leiden Observatory where astrometry was carried out. The trio are credited with the discovery of several thousand minor planets.^[11]

Orbit and classification

Sakharov is a member of the Vesta family, which is named after the main-belt's second-largest body, 4 Vesta. It orbits the Sun in the inner main-belt at a distance of 2.1–2.6 AU once every 3 years and 8 months (1,337 days). Its orbit has an eccentricity of 0.10 and an inclination of 6° with respect to the ecliptic.^[1] The body's observation arc begins with its official discovery observation at Palomar, .^[10]

Physical characteristics

The stony S-type asteroid, has been characterized as a Q-V-type by PanSTARRS photometric survey.^[9]

Rotation period

In 2011 and 2013, a total of four well-defined rotational lightcurves were obtained for this asteroid by astronomers Julian Oey at the Australian Kingsgrove and Leura/ Blue Mountains Observatory (E19 and E17/Q68)^[7][8] and by Petr Pravec at the Czech Ondřejov Observatory.^[a] The lightcurve gave a rotation period of 7.520 to 7.589 hours with a brightness variation between 0.12 and 0.22 in magnitude (U=3/3-/3-/3).

Diameter and albedo

According to the original data from the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 4.8 kilometers in diameter and its surface has an albedo of 0.31,^[5] while the Collaborative Asteroid Lightcurve Link agrees with the revised NEOWISE data^[4] which gave an albedo of 0.26 and a diameter of 4.5 kilometers with an absolute magnitude of 13.8.^[3]

Naming

This minor planet was named in honour of renowned Russian mathematician and physicist Andrei Sakharov (1921–1989), who received the Nobel Peace Prize in 1975.^[2] The official naming citation was published by the Minor Planet Center on 1 August 1981 (M.P.C. 6207).^[12]

Notes

1. Pravec (2011) web: rotation period 7.5209±0.0002 hours with a brightness amplitude of 0.13 magnitude and an absolute magnitude of 13.31 (see lightcurve plot). Also, Pravec(2013) web: rotation period 7.521±0.005 hours with a brightness amplitude of 0.21 mag. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (1979) Sakharov and Pravec, P.; Wolf, M.; Sarounova, L. (2011) / Pravec, P.; Wolf, M.; Sarounova, L. (2013)