147 Protogeneia
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Discovery[2] and designation
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| Discovered by | Lipót Schulhof |
| Discovery date | July 10, 1875 |
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Designations
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| Alternative names[1] | |
| Minor planet category |
Main belt |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 484.856 Gm (3.241 AU) |
| Perihelion | 452.926 Gm (3.028 AU) |
| Semi-major axis | 468.891 Gm (3.134 AU) |
| Eccentricity | 0.034 |
| Orbital period | 2026.831 d (5.55 a) |
| Average orbital speed | 16.82 km/s |
| Mean anomaly | 185.625° |
| Inclination | 1.935° |
| Longitude of ascending node | 248.729° |
| Argument of perihelion | 106.744° |
| Dimensions | 132.93 km[2] |
| Mass | 2.5×1018 kg |
| Mean density | 2.0 g/cm³ |
| Equatorial surface gravity | 0.0371 m/s² |
| Equatorial escape velocity | 0.0703 km/s |
| Sidereal rotation period |
7.853 hr[2] |
| Axial tilt | ?° |
| Pole ecliptic latitude | ? |
| Pole ecliptic longitude | ? |
| Geometric albedo | 0.0492[2] |
| Temperature | ~157 K |
| Spectral type | C |
| Apparent magnitude | 12.4 to 14.5 |
| Absolute magnitude | 8.27[2] |
147 Protogeneia is a large main belt asteroid with a low eccentricity and low inclination . It has a dark surface and probably a primitive composition of carbonaceous material.
It was discovered by Lipót Schulhof on July 10, 1875, his only asteroid discovery. It is named after Protogeneia, one of the daughters of Deucalion and Pyrra in Greek mythology.
There is one reported stellar occultation by Protogeneia, on May 28, 2002 from Texas.
[edit] References
[edit] External links
- Orbital simulation from JPL (Java) / Horizons Ephemeris
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