291 Alice

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291 Alice
291Alice (Lightcurve Inversion).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[1]
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)
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[1]
19×12×11 km [2][3]
Mass ~5×1015 (estimate)
Mean density
~2.7 g/cm³ (estimate)[4]
Equatorial surface gravity
~0.006 m/s² (estimate)
Equatorial escape velocity
~0.009 km/s (estimate)
4.313 h (0.1797 d) [1]
0.180 d (4.32 h) [5]
0.2075±0.033[1]
0.208 [2]
Temperature ~181 K
max: 267 K (-5°C)
S[6]
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.[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.

References[edit]

  1. ^ a b c d Yeomans, Donald K., "291 Alice", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 11 May 2016. 
  2. ^ a b Supplemental IRAS Minor Planet Survey
  3. ^ a b 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. 
  4. ^ 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. 
  5. ^ PDS lightcurve data[dead link]
  6. ^ "Asteroid Taxonomy". Planetary Science Institute. Retrieved 2016-02-27. 
  7. ^ Oey, Julian (December 2006), "Lightcurves analysis of 10 asteroids from Leura Observatory", The Minor Planet Bulletin 33 (4), pp. 96–99, Bibcode:2006MPBu...33...96O. 

External links[edit]