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 byJ. A. Bruwer
Discovery siteJohannesburg Obs.
Discovery date7 April 1953
Designations
(1660) Wood
Named after
Harry Edwin Wood
(astronomer)[2]
1953 GA · 1931 KL
1933 YC · 1951 RD1
1955 VQ
main-belt · Phocaea [3][4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc86.05 yr (31,429 days)
Aphelion3.1172 AU
Perihelion1.6726 AU
2.3949 AU
Eccentricity0.3016
3.71 yr (1,354 days)
182.68°
0° 15m 57.24s / day
Inclination20.575°
212.94°
276.66°
Physical characteristics
Dimensions11.342±0.113 km[5][6]
12.67 km (calculated)[3]
6.8088±0.0002 h[7]
6.8088±0.0004 h[8]
6.8090±0.0002 h[9]
0.23 (assumed)[3]
0.239±0.035[5][6]
SMASS = S [1] · S [3]
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]

    References
    1. "JPL Small-Body Database Browser: 1660 Wood (1953 GA)" (2017-06-06 last obs.). Jet Propulsion Laboratory. Retrieved 30 June 2017.
    2. Schmadel, Lutz D. (2007). "(1660) Wood". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 132. doi:10.1007/978-3-540-29925-7_1661. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1660) Wood". Asteroid Lightcurve Database (LCDB). Retrieved 23 December 2016.
    4. "Asteroid 1660 Wood – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 October 2019.
    5. Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
    6. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 23 December 2016.
    7. Han, Xianming L.; Li, Bin; Haibin, Zhao (January 2013). "Rotation Periods of 1660 Wood, 7173 Sepkoski, 12738 Satoshimiki and (23233) 2000 WM72". The Minor Planet Bulletin. 40 (1): 14–15. Bibcode:2013MPBu...40...14H. ISSN 1052-8091. Retrieved 23 December 2016.
    8. Hills, Kevin (October 2012). "Asteroid Lightcurve Analysis at Riverland Dingo Observatory: 1394 Algoa, 1660 Wood, 8882 Sakaetamura, and (15269) 1990 XF". The Minor Planet Bulletin. 39 (4): 239–240. Bibcode:2012MPBu...39..239H. ISSN 1052-8091. Retrieved 23 December 2016.
    9. Oey, Julian; Alvarez, Eduardo Manuel (July 2012). "Period Determination for 1660 Wood". The Minor Planet Bulletin. 39 (3): 147–148. Bibcode:2012MPBu...39..147O. ISSN 1052-8091. Retrieved 23 December 2016.
    10. Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 23 December 2016.
    11. "1660 Wood (1953 GA)". Minor Planet Center. Retrieved 23 December 2016.
    12. Schmadel, Lutz D. (2007). "(1811) Bruwer". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 145. doi:10.1007/978-3-540-29925-7_1812. ISBN 978-3-540-00238-3.
    13. Schmadel, Lutz D. "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.

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