Astronomy:291 Alice
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Short description: Main-belt asteroid
.png) A three-dimensional model of 291 Alice based on its light curve | |
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | 25 April 1890 |
| Designations | |
| (291) Alice | |
| A890 HA, 1954 UJ3 | |
| Minor planet category | main-belt |
| Orbital characteristics [1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 124.62 yr (45516 d) |
| |{{{apsis}}}|helion}} | 2.4273 astronomical unit|AU (363.12 Gm) |
| |{{{apsis}}}|helion}} | 2.01631 AU (301.636 Gm) |
| 2.22182 AU (332.380 Gm) | |
| Eccentricity | 0.092495 |
| Orbital period | 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 [1] 19×12×11 km [2][3] |
| Mass | ~ |
| Mean density | ~2.7 g/cm3[4] |
| Rotation period | 4.313 h (0.1797 d) [1] 0.180 d (4.32 h) [5] |
| Geometric albedo | 0.2075±0.033 [1] 0.208 [2] |
| S [6] | |
| Absolute magnitude (H) | 11.45 |
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.
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.[7] 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.
See also
References
- ↑ 1.0 1.1 1.2 1.3 Yeomans, Donald K., "291 Alice", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=291, retrieved 11 May 2016.
- ↑ 2.0 2.1 Supplemental IRAS Minor Planet Survey
- ↑ 3.0 3.1 A. Kryszczyńska (1996). "CCD Photometry of Seven Asteroids: New Spin Axis and Shape Determinations". Icarus 124 (1): 134–140. doi:10.1006/icar.1996.0194. Bibcode: 1996Icar..124..134K.
- ↑ G. A. Krasinsky (2002). "Hidden Mass in the Asteroid Belt". Icarus 158 (1): 98–105. doi:10.1006/icar.2002.6837. Bibcode: 2002Icar..158...98K.
- ↑ PDS lightcurve data
- ↑ "Asteroid Taxonomy". Planetary Science Institute. http://www.psi.edu//pds/resource/taxonomy.html.
- ↑ Oey, Julian (December 2006), "Lightcurves analysis of 10 asteroids from Leura Observatory", The Minor Planet Bulletin 33 (4): 96–99, Bibcode: 2006MPBu...33...96O.
External links
- 291 Alice at AstDyS-2, Asteroids—Dynamic Site
- 291 Alice at the JPL Small-Body Database
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