291 Alice
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A three-dimensional model of 291 Alice based on its light curve.
|
|
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | April 25, 1890 |
| Designations | |
| 1954 UJ3 | |
| main belt (Flora family) | |
| Orbital characteristics[1] | |
| Epoch 30 January 2005 (JD 2453400.5) | |
| Aphelion | 363.171 Gm (2.428 AU) |
| Perihelion | 301.612 Gm (2.016 AU) |
| 332.392 Gm (2.222 AU) | |
| Eccentricity | 0.093 |
| 1209.699 d (3.31 a) | |
|
Average orbital speed
|
19.98 km/s |
| 305.558° | |
| Inclination | 1.853° |
| 161.696° | |
| 331.644° | |
| Physical characteristics | |
| Dimensions | 19×12×11 km [2][3] |
| Mass | ~5×1015 (estimate) |
|
Mean density
|
~2.7 g/cm³ (estimate) [4] |
| ~0.006 m/s² (estimate) | |
| ~0.009 km/s (estimate) | |
| 0.180 d (4.32 h) [5] | |
| Albedo | 0.208 [2] |
| Temperature | ~181 K max: 267 K (-5°C) |
|
Spectral type
|
S [5] |
| 11.45 | |
291 Alice is an asteroid belonging to the Flora family in the main belt. It was discovered by Johann Palisa on April 25, 1890 at the Vienna Observatory.
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.[6] 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.[3] This gives an axial tilt of about 35° in both cases.
References
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 Supplemental IRAS Minor Planet Survey
- ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 PDS lightcurve data Cite error: Invalid
<ref>tag; name "PDS_lc" defined multiple times with different content - ↑ Lua error in package.lua at line 80: module 'strict' not found.
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