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630 Euphemia
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° 13m 54.588s / 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/cm3
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.^[5]

References

^ "euphemian". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
^ ^a ^b "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
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
630 Euphemia at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

This article about an S-type asteroid native to the asteroid belt is a stub. You can help Wikipedia by expanding it.

[1] "euphemian". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)

[jpldata-2] "630 Euphemia (1907 XW)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 7 May 2016.

[IRAS-3] "Supplemental IRAS Minor Planet Survey". Archived from the original on 23 June 2006.

[Krasinsky02-4] 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.

[mpb37_1_21-5] 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.

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