291 Alice
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | April 25, 1890 |
| Designations | |
| 1954 UJ3 | |
| main belt (Flora family) | |
| Orbital characteristics | |
| 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 [1][2] |
| Mass | ~5×1015 (estimate) |
Mean density | ~2.7 g/cm³ (estimate) [3] |
| ~0.006 m/s² (estimate) | |
| ~0.009 km/s (estimate) | |
| 0.180 d (4.32 h) [4] | |
| Albedo | 0.208 [1] |
| Temperature | ~181 K max: 267 K (-5°C) |
Spectral type | S [4] |
| 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.
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.[2] This gives an axial tilt of about 35° in both cases.
References
- ^ a b Supplemental IRAS Minor Planet Survey
- ^ a b A. Kryszczyńska; et al. (1996). "CCD Photometry of Seven Asteroids: New Spin Axis and Shape Determinations". Icarus. 124: 134. Bibcode:1996Icar..124..134K. doi:10.1006/icar.1996.0194.
{{cite journal}}: Explicit use of et al. in:|author=(help) - ^ G. A. Krasinsky; et al. (2002). "Hidden Mass in the Asteroid Belt". Icarus. 158: 98. Bibcode:2002Icar..158...98K. doi:10.1006/icar.2002.6837.
{{cite journal}}: Explicit use of et al. in:|author=(help) - ^ a b PDS lightcurve data Cite error: The named reference "PDS lc" was defined multiple times with different content (see the help page).
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