64 Angelina
From Wikipedia, the free encyclopedia
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Discovery
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| Discovered by | Ernst Wilhelm Tempel |
| Discovery date | March 4, 1861 |
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Designations
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| Minor planet category |
Main belt |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 451.375 Gm (3.017 AU) |
| Perihelion | 351.784 Gm (2.352 AU) |
| Semi-major axis | 401.580 Gm (2.684 AU) |
| Eccentricity | 0.124 |
| Orbital period | 1606.452 d (4.40 a) |
| Average orbital speed | 18.11 km/s |
| Mean anomaly | 107.758° |
| Inclination | 1.308° |
| Longitude of ascending node | 309.285° |
| Argument of perihelion | 179.641° |
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Physical characteristics
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| Dimensions | 48x53 km |
| Mass | ?×10? kg |
| Mean density | ? g/cm³ |
| Equatorial surface gravity | ? m/s² |
| Escape velocity | ? km/s |
| Rotation period | 0.365 d |
| Albedo | 0.157 |
| Temperature | ~170 K |
| Spectral type | E |
| Absolute magnitude | 7.67 |
64 Angelina is a medium-sized Main belt asteroid and is an uncommon E-type asteroid. It is the third largest E-type after 44 Nysa and 55 Pandora. It was formerly thought to be the largest of this class but recent work[1] has shown that its diameter is only a quarter of what was previously thought.
It was discovered on March 4, 1861 by a prolific comet discoverer, E. W. Tempel. It was first of his five asteroid discoveries.
E-type asteroids show unusual brightening when at close opposition to the Sun. This phenomenon is also known in Jupiter's moons Io, Ganymede and Europa, and also Saturn's moon Iapetus.
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