291 Alice Explained

Minorplanet:yes
Background:
  1. D6D6D6
291 Alice
Discovered:25 April 1890
Mpc Name:(291) Alice
Alt Names:A890 HA,
Orbit Ref: 
Epoch:31 July 2016 (JD 2457600.5)
Semimajor:2.22182AU
Perihelion:2.01631AU
Aphelion:2.4273abbr=onNaNabbr=on
Eccentricity:0.092495
Period:3.31 yr (1209.7 d)
Inclination:1.8555°
Asc Node:161.655°
Arg Peri:331.580°
Dimensions: 
19×12×11 km [1] [2]
Mass:~
Density:~2.7 g/cm3[3]
Rotation:4.313abbr=onNaNabbr=on 
0.180 d (4.32 h) [4]
Spectral Type:S [5]
Abs Magnitude:11.45
Albedo: 
0.208 
Mean Motion: / day
Observation Arc:124.62 yr (45516 d)
Uncertainty:0

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. 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.

See also

Notes and References

  1. http://www.psi.edu/pds/archive/astdata04/simps04/diamalb.tab Supplemental IRAS Minor Planet Survey
  2. A. Kryszczyńska. CCD Photometry of Seven Asteroids: New Spin Axis and Shape Determinations. Icarus. 1996. 124. 1. 134–140. 10.1006/icar.1996.0194. 1996Icar..124..134K. etal.
  3. G. A. Krasinsky. Hidden Mass in the Asteroid Belt. Icarus. 2002. 158. 1. 98–105. 10.1006/icar.2002.6837. 2002Icar..158...98K. etal.
  4. https://archive.today/20060614093519/http://www.psi.edu/pds/archive/lc.html PDS lightcurve data
  5. Web site: Asteroid Taxonomy. Planetary Science Institute. 2016-02-27.