1660 Wood

1660 Wood, provisional designation 1953 GA, is a stony Phocaea asteroid from the inner regions of the asteroid belt, approximately 12 kilometers in diameter. It was named after British–South African astronomer Harry Edwin Wood.

1660 Wood

Discovery[1]
Discovered by	J. A. Bruwer
Discovery site	Johannesburg Obs.
Discovery date	7 April 1953
Designations
MPC designation	(1660) Wood
Named after	Harry Edwin Wood (astronomer)[2]
Alternative designations	1953 GA · 1931 KL 1933 YC · 1951 RD1 1955 VQ
Minor planet category	main-belt · Phocaea[3][4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	86.05 yr (31,429 days)
Aphelion	3.1172 AU
Perihelion	1.6726 AU
Semi-major axis	2.3949 AU
Eccentricity	0.3016
Orbital period (sidereal)	3.71 yr (1,354 days)
Mean anomaly	182.68°
Mean motion	0° 15m 57.24s / day
Inclination	20.575°
Longitude of ascending node	212.94°
Argument of perihelion	276.66°
Physical characteristics
Dimensions	11.342±0.113 km[5][6] 12.67 km (calculated)[3]
Synodic rotation period	6.8088±0.0002 h[7] 6.8088±0.0004 h[8] 6.8090±0.0002 h[9]
Geometric albedo	0.23 (assumed)[3] 0.239±0.035[5][6]
Spectral type	SMASS = S[1] · S[3]
Absolute magnitude (H)	11.32±0.67[10] · 11.7[1][3] · 11.9[5]

Discovery

Wood was discovered on 7 April 1953, by South African astronomer Jacobus Bruwer at Johannesburg Observatory in South Africa.^[11] It was the second numbered discovery made by Bruwer. He also discovered the minor planets 1658 Innes, 1794 Finsen, and 3284 Niebuhr. The asteroid 1811 Bruwer was named in his honour by the Dutch, Dutch-American astronomer trio of the Palomar–Leiden survey.^[12]

Orbit and classification

Wood is a S-type asteroid and member of the Phocaea family (701).^[4] It orbits the Sun in the inner main-belt at a distance of 1.7–3.1 AU once every 3 years and 9 months (1,354 days). Its orbit has an eccentricity of 0.30 and an inclination of 21° with respect to the ecliptic.^[1] It was first identified as 1931 KL at Lowell Observatory in 1931, extending the body's observation arc by 22 years prior to its official discovery observation.^[11]

Physical characteristics

Rotation period

From January to March 2012, four rotational lightcurves of Wood were obtained from photometric observations taken by astronomers Julian Oey, Kevin Hills, and Xianming Han. Lightcurve analysis gave a concurring rotation period of 6.809 hours with a brightness variation between of 0.14 and 0.26 magnitude (U=3/3/3/2+).^[7][8][9]

Diameter and albedo

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Wood measures 11.34 kilometers in diameter, and its surface has an albedo of 0.239.^[5][6] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.23 and calculates a diameter of 12.67 kilometers with an absolute magnitude of 11.7.^[3]

Naming

This minor planet was named for British–South African astronomer Harry Edwin Wood (1881–1946), who was the second director of the Union Observatory at which the asteroid was discovered, and who had discovered 12 asteroids himself between 1911 and 1928. He had the prime responsibility for the famous Franklin-Adams Star Camera (Franklin-Adams photographic refractor) since its acquisition in 1909 (also see 1925 Franklin-Adams).^[2] The official naming citation was published by the Minor Planet Center on 1 July 1972 (M.P.C. 3297).^[13]