42 Isis
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A three-dimensional model of 42 Isis based on its light curve.
|
|
| Discovery | |
|---|---|
| Discovered by | Norman Robert Pogson |
| Discovery date | May 23, 1856 |
| Designations | |
|
Named after
|
Isis |
| Main belt | |
| Adjectives | Isidian |
| Orbital characteristics | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 446.706 Gm (2.986 AU) |
| Perihelion | 283.890 Gm (1.898 AU) |
| 365.298 Gm (2.442 AU) | |
| Eccentricity | 0.223 |
| 1393.737 d (3.82 a) | |
|
Average orbital speed
|
18.82 km/s |
| 121.874° | |
| Inclination | 8.530° |
| 84.398° | |
| 236.626° | |
| Physical characteristics | |
| Dimensions | 102.73 ± 2.73[1] km |
| Mass | (1.58 ± 0.52) × 1018[1] kg |
|
Mean density
|
2.78 ± 0.93[1] g/cm3 |
| 0.0280 m/s² | |
| 0.0530 km/s | |
| Albedo | 0.171 (geometric)[2] |
| Temperature | ~178 K |
|
Spectral type
|
S |
| 9.18[3] to 13.50 | |
| 7.53 | |
42 Isis /ˈaɪsᵻs/ is a large main-belt asteroid, measuring 100.2 km in diameter. It was discovered by N.R. Pogson on May 23, 1856, at Oxford. It was Pogson's first asteroid discovery.
The asteroid's name was chosen by Manuel John Johnson, director of the Radcliffe Observatory in Oxford. Although Isis is the name of an Egyptian goddess, the name was chosen in homage to Pogson's astronomer daughter, (Elizabeth) Isis Pogson.[4] In addition, the Isis is the stretch of the River Thames that runs through Oxford.[5]
The light curve inversion technique, when applied to photometric observations of this asteroid, show multiple local irregularities. The overall shape displays little elongation, with a ratio between the major and minor axes equal to 1.1. The measured rotation period for this model is 13.59701 hours.[6] The spectrum of 42 Isis reveals the strong presence of the mineral Olivine, a relatively rarity in the asteroid belt.[7]
References
- ↑ 1.0 1.1 1.2 Lua error in package.lua at line 80: module 'strict' not found. See Table 1.
- ↑ 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.
- ↑ Lutz D. Schmadel, Dictionary of Minor Planet Names: Addendum to Fifth Edition: 2006 - 2008.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
External links
- Orbital simulation from JPL (Java) / Ephemeris
