89 Julia
From Wikipedia, the free encyclopedia
|
Discovery
|
|
|---|---|
| Discovered by | Édouard Stephan |
| Discovery date | August 6, 1866 |
|
Designations
|
|
| Alternate name(s) | |
| Minor planet category |
Main belt |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 451.576 Gm (3.019 AU) |
| Perihelion | 311.336 Gm (2.081 AU) |
| Semi-major axis | 381.456 Gm (2.550 AU) |
| Eccentricity | 0.184 |
| Orbital period | 1487.227 d (4.07 a) |
| Average orbital speed | 18.49 km/s |
| Mean anomaly | 129.159° |
| Inclination | 16.142° |
| Longitude of ascending node | 311.648° |
| Argument of perihelion | 44.990° |
|
Physical characteristics
|
|
| Dimensions | 151.5 km |
| Mass | 3.6×1018 kg |
| Mean density | ? g/cm³ |
| Equatorial surface gravity | 0.0423 m/s² |
| Escape velocity | 0.0801 km/s |
| Rotation period | ? d |
| Albedo | 0.176 (geometric) [1] |
| Temperature | ~174 K |
| Spectral type | S |
| Apparent magnitude | 8.74[2] to 12.61 |
| Absolute magnitude (H) | 6.60 |
| Angular diameter | 0.18" to 0.052" |
89 Julia is a large main-belt asteroid. It was discovered by French astronomer Édouard Stephan on August 6, 1866. It was first of his two asteroid discoveries; the other was 91 Aegina. It is believed to be named after Saint Julia of Corsica. A stellar occultation by Julia was observed on December 20, 1985.
[edit] References
- ^ Asteroid Data Sets
- ^ "AstDys (89) Julia Ephemerides". Department of Mathematics, University of Pisa, Italy. http://hamilton.dm.unipi.it/astdys/index.php?pc=1.1.3.1&n=89&oc=500&y0=1972&m0=8&d0=6&h0=0&mi0=0&y1=1972&m1=8&d1=7&h1=0&mi1=0&ti=1.0&tiu=days. Retrieved 2010-06-27.
[edit] External links
- Orbital simulation from JPL (Java)
- Ephemeris
|
|||||
|
||||||||||||||||||||||
