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Discovery
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| Discovered by | August Kopff |
| Discovery date | March 7, 1907 |
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Designations
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| Named after | Euphemia |
| Alternate name(s) | 1907 XW; A924 DC |
| Minor planet category |
Main belt (Eunomia family) |
| 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° |
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Physical characteristics
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| Dimensions | 17 km[1] |
| Mass | ~7×1015 kg (estimate) |
| Mean density | ~2.7 g/cm³ (estimate)[2] |
| Equatorial 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.
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