1658 Innes
| Discovery [1] | |
|---|---|
| Discovered by | J. A. Bruwer |
| Discovery site | Johannesburg Obs. |
| Discovery date | 13 July 1953 |
| Designations | |
| MPC designation | 1658 Innes |
|
Named after
|
Robert T. A. Innes (astronomer)[2] |
| 1953 NA · 1940 GB 1948 EM · 1949 QA 1953 OF · 1953 PN 1957 OE |
|
| main-belt · (inner) [3] | |
| Orbital characteristics [1] | |
| Epoch 27 June 2015 (JD 2457200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 75.54 yr (27,592 days) |
| Aphelion | 3.0304 AU |
| Perihelion | 2.0877 AU |
| 2.5590 AU | |
| Eccentricity | 0.1841 |
| 4.09 yr (1,495 days) | |
| 54.432° | |
| Inclination | 9.0929° |
| 95.449° | |
| 188.89° | |
| Physical characteristics | |
| Dimensions | 14.76 km (calculated)[3] |
| 3.191 h[4][5] | |
| 0.20 (assumed)[3] | |
| B–V = 0.960 U–B = 0.610 Tholen = AS A [3] |
|
| 11.52 | |
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1658 Innes, provisional designation 1953 NA, is an asteroid from the inner regions of the asteroid belt, about 15 kilometers in diameter. It was discovered on 13 July 1953 by South African astronomer Jacobus Albertus Bruwer at Union Observatory in Johannesburg.[6]
The spectral type of the asteroid is that of a rare A-type.[7] It orbits the Sun at a distance of 2.1–3.0 AU once every 4 years and 1 month (1,495 days). Its orbit shows an eccentricity of 0.18 and is tilted by 9 degrees to the plane of the ecliptic. Light-curve observations carried out in May 2014 gave it a rotation period of 3.2 hours.[4][5] The body has an assumed geometric albedo of 0.20.[3]
The asteroid was named after the Scottish–South African astronomer Robert T. A. Innes (1861–1933), first director of the discovering Union Observatory from 1903 to 1927 (originally named Transvaal Observatory). He was a skilled observational astronomer, famous for his deliberate search and discovery of the nearest star, Proxima Centauri, in 1915. He also made important theoretical and computational contributions to celestial mechanics and to the irregular rotation of the Earth. The astronomer is also honored by the lunar crater Innes.[2]
1658 Innes was the first numbered discovery of astronomer Jacobus Bruwer. In addition, he also discovered the minor planets 1660 Wood, 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.[8]
References
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<references />, or <references group="..." />External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 1658 Innes at the JPL Small-Body Database
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