78 Diana
| Discovery | |
|---|---|
| Discovered by | Karl Theodor Robert Luther |
| Discovery date | March 15, 1863 |
| Designations | |
|
Named after
|
Diana |
| 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) |
| 391.934 Gm (2.620 AU) | |
| Eccentricity | 0.207 |
| 1548.922 d (4.24 a) | |
|
Average orbital speed
|
18.20 km/s |
| 353.808° | |
| Inclination | 8.688° |
| 333.582° | |
| 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 |
| 0.0337 m/s² | |
| 0.0638 km/s | |
| 7.2991[3] h | |
| Albedo | 0.071 [4] |
| Temperature | ~172 K |
|
Spectral type
|
C |
| 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]
Diana is expected to pass about 0.003 AU (450,000 km; 280,000 mi) from (29075) 1950 DA on August 5, 2150.[7] Main-belt asteroid 4217 Engelhardt (~9 km in diameter) will pass about 0.0017 AU (250,000 km; 160,000 mi) from (29075) 1950 DA in 2736.[7]
References
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 Lua error in package.lua at line 80: module 'strict' not found. See Table 1.
- ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Asteroid Data Sets
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 7.0 7.1 Lua error in package.lua at line 80: module 'strict' not found.
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