630 Euphemia

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

Last updated September 25, 2025

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.)
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 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

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

[jpldata-2] 1 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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