| Discovery | |
|---|---|
| Discovered by | August Kopff |
| Discovery date | 7 March 1907 |
| Designations | |
| MPC designation | (630) Euphemia |
| Pronunciation | /juːˈfiːmiə/ |
| Named after | Euphemia |
| Alternative designations | 1907 XW; A924 DC |
| Minor planet category | Main belt (Eunomia family) |
| Orbital characteristics | |
| 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) |
| Semi-major axis | 2.6244 AU (392.60 Gm) |
| Eccentricity | 0.11086 |
| Orbital period (sidereal) | 4.25 yr (1552.9 d) |
| Mean anomaly | 273.57° |
| Mean motion | 0° 13 54.588 / day |
| Inclination | 13.855° |
| Longitude of ascending node | 105.419° |
| Argument of perihelion | 40.148° |
| Physical characteristics | |
| Mean radius | 8.605±0.45 km 8.5 km |
| Mean density | ~2.7 g/cm |
| Synodic rotation period | 350 h (15 d) |
| Geometric albedo | 0.2375±0.027 |
| Spectral type | S-type asteroid |
| Absolute magnitude (H) | 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.
References
- "euphemian". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
- ^ "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 23 June 2006.
- G. A. Krasinsky; et al. (2002). "Hidden Mass in the Asteroid Belt". Icarus. 158 (1): 98. Bibcode:2002Icar..158...98K. 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
- Lightcurve plot of 630 Euphemia, Palmer Divide Observatory, B. D. Warner (2005)
- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 630 Euphemia at AstDyS-2, Asteroids—Dynamic Site
- 630 Euphemia at the JPL Small-Body Database
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