291 Alice
Alice (minor planet designation: 291 Alice) is a stony background asteroid from the inner region of the asteroid belt. It was discovered by Johann Palisa on 25 April 1890 at the Vienna Observatory.
A three-dimensional model of 291 Alice based on its light curve | |
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | 25 April 1890 |
| Designations | |
MPC designation | (291) Alice |
Alternative designations | A890 HA, 1954 UJ3 |
Minor planet category | main-belt |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 124.62 yr (45516 d) |
| Aphelion | 2.4273 AU (363.12 Gm) |
| Perihelion | 2.01631 AU (301.636 Gm) |
Semi-major axis | 2.22182 AU (332.380 Gm) |
| Eccentricity | 0.092495 |
Orbital period (sidereal) | 3.31 yr (1209.7 d) |
Mean anomaly | 115.293° |
Mean motion | 0° 17m 51.382s / day |
| Inclination | 1.8555° |
Longitude of ascending node | 161.655° |
| 331.580° | |
| Physical characteristics | |
| Dimensions | 14.97±1.1 km 19×12×11 km |
| Mass | ~ |
Mean density | ~2.7 g/cm3 |
Synodic rotation period | 4.313 h (0.1797 d) 0.180 d (4.32 h) |
| 0.2075±0.033 0.208 | |
| S | |
| 11.45 | |
Photometric observations of this asteroid at the Leura Observatory in Leura, Australia during 2006 gave a rotation period of 4.313 ± 0.002 hours and a brightness variation of 0.20 ± 0.02 in magnitude. This result is in agreement with previous studies. Lightcurve analysis indicates that Alice's pole points towards either ecliptic coordinates (β, λ) = (55°, 65°) or (β, λ) = (55°, 245°) with a 10° uncertainty. This gives an axial tilt of about 35° in both cases.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.