630 Euphemia
| Discovery | |
|---|---|
| Discovered by | August Kopff |
| Discovery date | 7 March 1907 |
| Designations | |
Named after | Euphemia |
| 1907 XW; A924 DC | |
| Main belt (Eunomia family) | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 91.87 yr (33557 d) |
| Aphelion | 2.9153 AU (436.12 Gm) |
| Perihelion | 2.3334 AU (349.07 Gm) |
| 2.6244 AU (392.60 Gm) | |
| Eccentricity | 0.11086 |
| 4.25 yr (1552.9 d) | |
Average orbital speed | 18.33 km/s |
| 273.57° | |
| 0° 13m 54.588s / day | |
| Inclination | 13.855° |
| 105.419° | |
| 40.148° | |
| Earth MOID | 1.36213 AU (203.772 Gm) |
| Jupiter MOID | 2.18621 AU (327.052 Gm) |
| Jupiter Tisserand parameter | 3.353 |
| Physical characteristics | |
Mean radius |
8.605±0.45 km[1] 8.5 km[2] |
| Mass | ~7×1015 kg (estimate) |
Mean density | ~2.7 g/cm³ (estimate)[3] |
Equatorial surface gravity | ~0.006 m/s² (estimate) |
Equatorial escape velocity | ~0.011 km/s (estimate) |
| 350 h (15 d) | |
| 0.2375±0.027 | |
| Temperature |
~165 K max: 248K (-26° C) |
| S-type asteroid | |
| 11.1 | |
|
| |
630 Euphemia is a mid-sized Eunomian asteroid.
Photometric observations at the Palmer Divide Observatory during 2005 showed a best fit rotation period of 79.18 ± 0.02 hours with a brightness variation of 0.2 ± 0.02 in magnitude. However, some uncertainty remains concerning the reliability of this result.[4]
References
- 1 2 "630 Euphemia (1907 XW)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 7 May 2016.
- ↑ "Supplemental IRAS Minor Planet Survey". Archived from the original on 2006-06-23.
- ↑ G. A. Krasinsky; et al. (2002). "Hidden Mass in the Asteroid Belt". Icarus. 158: 98. doi:10.1006/icar.2002.6837.
- ↑ Warner, Brian D. (December 2005), "Asteroid lightcurve analysis at the Palmer Divide Observatory - spring 2005", The Minor Planet Bulletin, 32 (4): 90–92, Bibcode:2005MPBu...32...90W.
External links
- Discovery Circumstances: Numbered Minor Planets
- NASA's Jet Propulsion Laboratory Datasite page on this space object
- 630 Euphemia at the JPL Small-Body Database
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