291 Alice
.png)
A three-dimensional model of 291 Alice based on its light curve.
|
|
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | 25 April 1890 |
| Designations | |
| 1954 UJ3 | |
| main belt (Flora family) | |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 124.62 yr (45516 d) |
| Aphelion | 2.4273 AU (363.12 Gm) |
| Perihelion | 2.01631 AU (301.636 Gm) |
| 2.22182 AU (332.380 Gm) | |
| Eccentricity | 0.092495 |
| 3.31 yr (1209.7 d) | |
|
Average orbital speed
|
19.98 km/s |
| 115.293° | |
| 0° 17m 51.382s / day | |
| Inclination | 1.8555° |
| 161.655° | |
| 331.580° | |
| Earth MOID | 1.0294 AU (154.00 Gm) |
| Jupiter MOID | 2.59467 AU (388.157 Gm) |
| Jupiter Tisserand parameter | 3.643 |
| Physical characteristics | |
| Dimensions |
14.97±1.1 km 19×12×11 km |
| Mass | ~5×1015(estimate) |
|
Mean density
|
~2.7 g/cm³ (estimate) |
|
Equatorial surface gravity
|
~0.006 m/s² (estimate) |
|
Equatorial escape velocity
|
~0.009 km/s (estimate) |
| 4.313 h (0.1797 d) 0.180 d (4.32 h) |
|
|
0.2075±0.033 0.208 |
|
| Temperature | ~181 K max: 267 K (-5°C) |
| S | |
| 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.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. This gives an axial tilt of about 35° in both cases.
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