78 Diana
| Discovery | |
|---|---|
| Discovered by | Karl Theodor Robert Luther |
| Discovery date | March 15, 1863 |
| Designations | |
| Named after | Diana |
| Minor planet category | Main belt |
| Orbital characteristics[1] | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 473.182 Gm (3.163 AU) |
| Perihelion | 310.686 Gm (2.077 AU) |
| Semi-major axis | 391.934 Gm (2.620 AU) |
| Eccentricity | 0.207 |
| Orbital period | 1548.922 d (4.24 a) |
| Average orbital speed | 18.20 km/s |
| Mean anomaly | 353.808° |
| Inclination | 8.688° |
| Longitude of ascending node | 333.582° |
| Argument of perihelion | 151.423° |
| Physical characteristics | |
| Dimensions | 123.63 ± 4.57[2] km |
| Mass | (1.27 ± 0.13) × 1018[2] kg |
| Mean density | 1.28 ± 0.19[2] g/cm3 |
| Equatorial surface gravity | 0.0337 m/s² |
| Escape velocity | 0.0638 km/s |
| Rotation period | 7.2991[3] h |
| Albedo | 0.071 [4] |
| Temperature | ~172 K |
| Spectral type | C |
| Absolute magnitude (H) | 8.09 |
78 Diana (dye-an'-a) is a large and dark main-belt asteroid. Its composition is carbonaceous and primitive. It was discovered by Robert Luther on March 15, 1863,[5] and named after Diana, Roman goddess of the hunt. 78 Diana occulted a star on September 4, 1980. A diameter of 116 km was measured, closely matching the value given by the IRAS satellite.
Photometric observations of this asteroid during 1986 and 2006–08 gave a light curve with a period of 7.2991 hours and a brightness variation in the range 0.02–0.104 magnitude.[3] Based upon radar data, the near surface solid density of the asteroid is 2.7+0.8
−0.5 g cm–3.[6]
References
- ^ Yeomans, Donald K., "78 Diana", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-03-30.
- ^ a b c Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: 98-118, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
- ^ a b Radeva, V. et al. (2011), "Rotation periods of the asteroids 55 Pandora, 78 Diana and 815 Coppelia", Bulgarian Astronomical Journal 17: 133–141, Bibcode:2012MPBu...39...57P.
- ^ Asteroid Data Sets
- ^ "Numbered Minor Planets 1–5000", Discovery Circumstances (IAU Minor Planet center), retrieved 2013-04-07.
- ^ Magri, C. et al. (December 2001), "Radar constraints on asteroid regolith compositions using 433 Eros as ground truth", Meteoritics & Planetary Science 36 (12): 1697-1709, Bibcode:2001M&PS...36.1697M, doi:10.1111/j.1945-5100.2001.tb01857.x.
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