630 Euphemia

630 Euphemia

Discovery
Discovered by	August Kopff
Discovery date	March 7, 1907
Designations
Named after	Euphemia
Alternative names	1907 XW; A924 DC
Minor planet category	Main belt (Eunomia family)
Orbital characteristics
Epoch August 18, 2005 (JD 2453600.5)
Aphelion	437.1 Gm (2.922 AU)
Perihelion	348.0 Gm (2.326 AU)
Semi-major axis	392.5 Gm (2.624 AU)
Eccentricity	0.114
Orbital period	1552.5 d (4.76 a)
Average orbital speed	18.33 km/s
Mean anomaly	65.452°
Inclination	13.844°
Longitude of ascending node	105.571°
Argument of perihelion	40.580°
Physical characteristics
Dimensions	17 km[1]
Mass	~7×10^15 kg (estimate)
Mean density	~2.7 g/cm³ (estimate)[2]
Surface gravity	~0.006 m/s² (estimate)
Escape velocity	~0.011 km/s (estimate)
Rotation period	unknown
Albedo	0.238
Temperature	~165 K max: 248K (-26° C)
Spectral type	S-type asteroid
Absolute magnitude (H)	11.00

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.^[3]

References

1. "Supplemental IRAS Minor Planet Survey".
2. G. A. Krasinsky; et al. (2002). "Hidden Mass in the Asteroid Belt". Icarus 158: 98.
3. 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

• Discovery · Orbit diagram · Orbital elements · Physical parameters