1658 Innes
| Discovery | |
|---|---|
| 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) |
| 1953 NA · 1940 GB 1948 EM · 1949 QA 1953 OF · 1953 PN 1957 OE |
|
| main-belt · (middle) | |
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 76.60 yr (27,978 days) |
| Aphelion | 3.0299 AU |
| Perihelion | 2.0865 AU |
| 2.5582 AU | |
| Eccentricity | 0.1844 |
| 4.09 yr (1,495 days) | |
| 199.05° | |
| 0° 14m 27.24s / day | |
| Inclination | 9.0943° |
| 95.443° | |
| 188.80° | |
| Physical characteristics | |
| Dimensions |
13.352±0.140 km 13.54±1.17 km 14.082±0.042 km 14.76 km (calculated) |
| 3.191±0.001 h | |
| 0.20 (assumed) 0.2241±0.0369 0.248±0.019 0.626±0.318 |
|
|
B–V = 0.960 U–B = 0.610 Tholen = AS · AS |
|
| 11.27±0.41 · 10.47 · 11.52 | |
1658 Innes, provisional designation 1953 NA, is a rare-type asteroid from the middle region of the asteroid belt, approximately 15 kilometers in diameter. It was discovered on 13 July 1953, by South African astronomer Jacobus Bruwer at Johannesburg Observatory in South Africa.
In the Tholen taxonomy, Innes has an AS-spectral type, an intermediate form of the rare A-types to the common stony asteroids (also see category listing). 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 has an eccentricity of 0.18 and an inclination of 9° with respect to the ecliptic.Innes was first identified as 1940 GB at Turku Observatory in 1940, extending the body's observation arc by 13 years prior to its official discovery observation.
In May 2005, astronomers Robert D. Stephens at the Center for Solar System Studies, California, and Lorenzo Franco at Balzaretto Observatory, near Rome, each obtained a rotational light-curve of Innes. The photometric observations gave an identical rotation period of 3.191±0.001 hours with a brightness variation of 0.22 and 0.25 magnitude, respectively (U=3/3).
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