291 Alice

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291 Alice
Discovery A
Discoverer Johann Palisa
Discovery date April 25, 1890
Alternate
designations B		 1954 UJ3
Category Main belt (Flora family)
Orbital elements C
Epoch 30 January 2005 (JD 2453400.5)
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)
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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 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

  1. ^ a b Supplemental IRAS Minor Planet Survey
  2. ^ a b A. Kryszczyńska et al (1996). "CCD Photometry of Seven Asteroids: New Spin Axis and Shape Determinations". Icarus 124: 134. 
  3. ^ G. A. Krasinsky et al (2002). "Hidden Mass in the Asteroid Belt". Icarus 158: 98. doi:10.1006/icar.2002.6837. 
  4. ^ a b PDS lightcurve data
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