| Discovery | |
|---|---|
| Discovered by | P. P. Henry |
| Discovery date | January 26, 1876 |
| Designations | |
| Alternate name | 1904 OK, 1959 EG1 |
| Minor planet category | Main belt (Hygiea family) |
| Epoch 26 November 2005 (JD 2453700.5) | |
| Aphelion | 515.348 Gm (3.445 AU) |
| Perihelion | 412.241 Gm (2.756 AU) |
| Semi-major axis | 463.794 Gm (3.100 AU) |
| Eccentricity | 0.111 |
| Orbital period | 1993.879 d (5.46 a) |
| Average orbital speed | 16.86 km/s |
| Mean anomaly | 227.956° |
| Inclination | 6.128° |
| Longitude of ascending node | 134.336° |
| Argument of perihelion | 335.594° |
| Physical characteristics | |
| Dimensions | 125 km[1] |
| Mass | ~1.4×1018 kg (estimate) |
| Mean density | ~1.4 g/cm³ (estimate)[4] |
| Equatorial surface gravity | ~0.024 m/s² (estimate) |
| Escape velocity | ~0.055 km/s (estimate) |
| Rotation period | ~1.05 d [2] |
| Albedo | 0.0639 [1] |
| Temperature | ~160 K max: 239K (-34° C) |
| Spectral type | C |
| Absolute magnitude (H) | 8.12 |
| | |
159 Aemilia is a large Main belt asteroid. This slowly rotating, dark asteroid has a primitive carbonaceous composition.
It orbits within the Hygiea family, although it may be an unrelated interloping asteroid, as it is too big to have arisen from the cratering process that most likely produced that family.
Aemilia was discovered by the brothers Paul Henry and Prosper Henry on January 26, 1876. The credit for this discovery was given to Paul. It is probably named after the Via Aemilia, a Roman road in Italy that runs from Piacenza to Rimini.
Two stellar occultations by Aemilia have been recorded so far, the first in 2001 and the second in 2003 [3].
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