159 Aemilia
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| Discovery A | |
|---|---|
| Discoverer | P. P. Henry |
| Discovery date | January 26, 1876 |
| Alternate designations B |
1904 OK, 1959 EG1 |
| Category | Main belt (Hygiea family) |
| Orbital elements C | |
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| Eccentricity (e) | 0.111 |
| Semi-major axis (a) | 463.794 Gm (3.100 AU) |
| Perihelion (q) | 412.241 Gm (2.756 AU) |
| Aphelion (Q) | 515.348 Gm (3.445 AU) |
| Orbital period (P) | 1993.879 d (5.46 a) |
| Mean orbital speed | 16.86 km/s |
| Inclination (i) | 6.128° |
| Longitude of the ascending node (Ω) |
134.336° |
| Argument of perihelion (ω) |
335.594° |
| Mean anomaly (M) | 227.956° |
| Physical characteristics D | |
| Dimensions | 125 km[1] |
| Mass | ~1.4×1018 kg (estimate) |
| Density | ~1.4 g/cm³ (estimate)[4] |
| Surface gravity | ~0.024 m/s² (estimate) |
| Escape velocity | ~0.055 km/s (estimate) |
| Rotation period | ~1.05 d [2] |
| Spectral class | C-type asteroid |
| Absolute magnitude | 8.12 |
| Albedo (geometric) | 0.0639 [1] |
| Mean surface temperature |
~160 K max: 239K (-34° C) |
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].
[edit] References
- PDS lightcurve data
- PDS occultation data
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G. A. Krasinsky et al Hidden Mass in the Asteroid Belt, Icarus, Vol. 158, p. 98 (2002).
| Minor planets | ||
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| Previous minor planet | 159 Aemilia | Next minor planet |
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| For other objects and regions, see: asteroid groups and families, binary asteroids, asteroid moons and the Solar system For a complete listing, see: List of asteroids. See also Pronunciation of asteroid names and Meanings of asteroid names. |
