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Discovery[1] and designation
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|---|---|
| Discovered by | Lipót Schulhof |
| Discovery date | July 10, 1875 |
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Designations
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| Named after | Protogeneia |
| Alternate name(s) | |
| 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[1] |
| 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[1] |
| Axial tilt | ?° |
| Pole ecliptic latitude | ? |
| Pole ecliptic longitude | ? |
| Geometric albedo | 0.0492[1] |
| Temperature | ~157 K |
| Spectral type | C |
| Apparent magnitude | 12.4 to 14.5 |
| Absolute magnitude (H) | 8.27[1] |
147 Protogeneia is a large main belt asteroid with a low orbital eccentricity and inclination. It has a dark surface and probably a primitive composition of carbonaceous material.
Protogeneia was discovered by Lipót Schulhof on July 10, 1875 from the Vienna Observatory; it was his only asteroid discovery. Its name is Greek for "first born" and was chosen by Karl L. Littrow in allusion to the fact that this was the first asteroid discovered by an astronomer who was already known for work in other fields of astronomy.[2]
There is one reported stellar occultation by Protogeneia, on May 28, 2002, from Texas.
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