291 Alice
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Discovery
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| Discovered by | Johann Palisa |
| Discovery date | April 25, 1890 |
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Designations
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| Alternate name(s) | 1954 UJ3 |
| Minor planet category |
main belt (Flora family) |
| Epoch 30 January 2005 (JD 2453400.5) | |
| Aphelion | 363.171 Gm (2.428 AU) |
| Perihelion | 301.612 Gm (2.016 AU) |
| Semi-major axis | 332.392 Gm (2.222 AU) |
| Eccentricity | 0.093 |
| Orbital period | 1209.699 d (3.31 a) |
| Average orbital speed | 19.98 km/s |
| Mean anomaly | 305.558° |
| Inclination | 1.853° |
| Longitude of ascending node | 161.696° |
| Argument of perihelion | 331.644° |
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Physical characteristics
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| Dimensions | 19×12×11 km [1][2] |
| Mass | ~5×1015 (estimate) |
| Mean density | ~2.7 g/cm³ (estimate) [3] |
| Equatorial surface gravity | ~0.006 m/s² (estimate) |
| Escape velocity | ~0.009 km/s (estimate) |
| Rotation period | 0.180 d (4.32 h) [4] |
| Albedo | 0.208 [1] |
| Temperature | ~181 K max: 267 K (-5°C) |
| Spectral type | S [4] |
| Absolute magnitude (H) | 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.
[edit] 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.
- ^ 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.
- ^ a b PDS lightcurve data
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