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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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| Alternate name | |
| 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 (H) | 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.
Angelina is a high albedo asteroid.[1]
Angelina has a average radius of about 30 kilometers.[2]
It was named for astronomical station at Marsielle, France set up by Franz Xaver von Zach.
References
- ^ "On the Polarization Opposition Effect of E-Type Asteroid 64 Angelina", N. N. Kiseleva, N. M. Shakhovskoyb and Yu. S. Efimovb, Astronomical Observatory of Kharkov University, Sumskaya st., 35, Kharkov, 310022, Ukrainef1b Crimean Astrophysical Observatory, Nauchny, 334413, Ukraine ScienceDirect article
- ^ "EXPLOSIVE ERUPTIONS ON ASTEROIDS: THE MISSING BASALTS ON ME AUBRIE PARENT BODY; Lionel i l s o n l and Klaus e i l l ;1 Planetary Geosciences Div., School of Ocean & Earth Science & Technology, University of Hawaii, Honolulu, Hawaii 96822, U.S.A., Environmental Science Div., Institute of Environmental & Biological Sciences, Lancaster University, Lancaster
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