287 Nephthys
From Biocrawler, the free encyclopedia.
| Discovery A (http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html) | |
|---|---|
| Discoverer | C. H. F. Peters |
| Discovery date | August 25, 1889 |
| Alternate designations | B (http://cfa-www.harvard.edu/iau/MPDes.html) |
| Category | Main belt |
| Orbital elements C (http://asteroid.lowell.edu/) Epoch 30 January, 2005 (JD 2453400.5) | |
| Eccentricity (e) | 0.023 |
| Semi-major axis (a) | 352.002 Gm (2.353 AU) |
| Perihelion (q) | 343.744 Gm (2.298 AU) |
| Aphelion (Q) | 360.26 Gm (2.408 AU) |
| Orbital period (P) | 1318.315 d (3.61 a) |
| Mean orbital speed | 19.42 km/s |
| Inclination (i) | 10.023° |
| Longitude of the ascending node (Ω) | 142.493° |
| Argument of perihelion (ω) | 120.15° |
| Mean anomaly (M) | 59.725° |
| Physical characteristics | |
| Dimensions | 68.0 km |
| Mass | unknown |
| Density | unknown |
| Surface gravity | unknown |
| Escape velocity | unknown |
| Rotation period | unknown |
| Spectral class | S |
| Absolute magnitude | 8.3 |
| Albedo | unknown |
| Mean surface temperature | unknown |
287 Nephthys is a large Main belt asteroid. It is classified as a S-type asteroid and is probably composed of a mixture of silicates and metals.
It was discovered by C. H. F. Peters on August 25, 1889 in Clinton.
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