Astronomy:291 Alice

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Short description: Main-belt asteroid
291 Alice
291Alice (Lightcurve Inversion).png
A three-dimensional model of 291 Alice based on its light curve
Discovery
Discovered byJohann Palisa
Discovery date25 April 1890
Designations
(291) Alice
A890 HA, 1954 UJ3
Minor planet categorymain-belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc124.62 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)
Eccentricity0.092495
Orbital period3.31 yr (1209.7 d)
Mean anomaly115.293°
Mean motion0° 17m 51.382s / day
Inclination1.8555°
Longitude of ascending node161.655°
331.580°
Physical characteristics
Dimensions14.97±1.1 km[1]
19×12×11 km [2][3]
Mass~
Mean density~2.7 g/cm3[4]
Rotation period4.313 h (0.1797 d) [1]
0.180 d (4.32 h) [5]
Geometric albedo0.2075±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. 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. 2.0 2.1 Supplemental IRAS Minor Planet Survey
  3. 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. Bibcode1996Icar..124..134K. 
  4. G. A. Krasinsky (2002). "Hidden Mass in the Asteroid Belt". Icarus 158 (1): 98–105. doi:10.1006/icar.2002.6837. Bibcode2002Icar..158...98K. 
  5. PDS lightcurve data
  6. "Asteroid Taxonomy". Planetary Science Institute. http://www.psi.edu//pds/resource/taxonomy.html. 
  7. Oey, Julian (December 2006), "Lightcurves analysis of 10 asteroids from Leura Observatory", The Minor Planet Bulletin 33 (4): 96–99, Bibcode2006MPBu...33...96O. 

External links