291 Alice
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| Discovery A | |
|---|---|
| Discoverer | Johann Palisa |
| Discovery date | April 25, 1890 |
| Alternate designations B |
1954 UJ3 |
| Category | Main belt (Flora family) |
| Orbital elements C | |
|
|
|
| Eccentricity (e) | 0.093 |
| Semi-major axis (a) | 332.392 Gm (2.222 AU) |
| Perihelion (q) | 301.612 Gm (2.016 AU) |
| Aphelion (Q) | 363.171 Gm (2.428 AU) |
| Orbital period (P) | 1209.699 d (3.31 a) |
| Mean orbital speed | 19.98 km/s |
| Inclination (i) | 1.853° |
| Longitude of the ascending node (Ω) |
161.696° |
| Argument of perihelion (ω) |
331.644° |
| Mean anomaly (M) | 305.558° |
| Physical characteristics D | |
| Dimensions | 19×12×11 km [1][2] |
| Mass | ~5×1015 (estimate) |
| Density | ~2.7 g/cm³ (estimate) [3] |
| Surface gravity | ~0.006 m/s² (estimate) |
| Escape velocity | ~0.009 km/s (estimate) |
| Rotation period | 0.180 d (4.32 h) [4] |
| Spectral class | S [4] |
| Absolute magnitude | 11.45 |
| Albedo (geometric) | 0.208 [1] |
| Mean surface temperature |
~181 K max: 267 K (-5°C) |
291 Alice is an asteroid belonging to the Flora family in the Main Belt.
It was discovered by Johann Palisa on April 25, 1890 in Vienna.
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.
- ^ G. A. Krasinsky et al (2002). "Hidden Mass in the Asteroid Belt". Icarus 158: 98.
- ^ a b PDS lightcurve data
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|---|---|---|
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| List of asteroids | ||
Vulcanoids · Near-Earth asteroids · Main belt · Jupiter Trojans · Centaurs · Damocloids · Comets · Trans-Neptunians (Kuiper belt • Scattered disc • Oort cloud)
For other objects and regions, see Asteroid groups and families, Binary asteroids, Asteroid moons and the Solar System.
For a complete listing, see List of asteroids. See also Pronunciation of asteroid names and Meanings of asteroid names.
