291 Alice
|
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 | |
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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
- ↑ Yeomans, Donald K., "291 Alice", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-03-30.
- 1 2 Supplemental IRAS Minor Planet Survey
- 1 2 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.
- 1 2 PDS lightcurve data
- ↑ Oey, Julian (December 2006), "Lightcurves analysis of 10 asteroids from Leura Observatory", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 33 (4), pp. 96–99, Bibcode:2006MPBu...33...96O.
External links
- 291 Alice at the JPL Small-Body Database
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