| Discovery | |
|---|---|
| Discovered by | Joel Hastings Metcalf |
| Discovery site | Taunton, Massachusetts |
| Discovery date | 5 May 1907 |
| Designations | |
| MPC designation | (638) Moira |
| Pronunciation | /ˈmɔɪrə/ |
| Named after | Moirae |
| Alternative designations | 1907 ZQ |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 110.22 yr (40257 d) |
| Aphelion | 3.1701 AU (474.24 Gm) |
| Perihelion | 2.3005 AU (344.15 Gm) |
| Semi-major axis | 2.7353 AU (409.20 Gm) |
| Eccentricity | 0.15896 |
| Orbital period (sidereal) | 4.52 yr (1652.4 d) |
| Mean anomaly | 54.7967° |
| Mean motion | 0° 13 4.332 / day |
| Inclination | 7.7123° |
| Longitude of ascending node | 103.208° |
| Argument of perihelion | 128.586° |
| Physical characteristics | |
| Mean radius | 32.72±0.7 km |
| Synodic rotation period | 9.875 h (0.4115 d) |
| Geometric albedo | 0.060 |
| Absolute magnitude (H) | 10.0 |
638 Moira, also known as A907 JG, is a minor planet orbiting the Sun. First observed in 1906, 638 Moira was discovered to be an orbital body in 1907 by Joel Hastings Metcalf in Taunton, England. 638 Moira is a little over 59.5 km across and rotates once every 10 hours. Its farthest point from the sun is a little over 3au during its 4.5 year orbit, and it is classed as an L-type asteroid (SMASSII).
References
- "638 Moira (1907 ZQ)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 5 May 2016.
External links
- 638 Moira at AstDyS-2, Asteroids—Dynamic Site
- 638 Moira at the JPL Small-Body Database
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