291 Alice

Minor Planet | name=291 Alice
discoverer=Johann Palisa
discovery_date=April 25, 1890
designations=mp|1954 UJ|3
category=Main belt (Flora family)
epoch=30 January, 2005 (JD 2453400.5)
semimajor=332.392 Gm (2.222 AU)
perihelion=301.612 Gm (2.016 AU)
aphelion=363.171 Gm (2.428 AU)
eccentricity=0.093
period=1209.699 d (3.31 a)
inclination=1.853°
asc_node=161.696°
arg_peri=331.644°
mean_anomaly=305.558°
speed=19.98 km/s
dimensions=19×12×11 km [http://www.psi.edu/pds/archive/astdata04/simps04/diamalb.tab Supplemental IRAS Minor Planet Survey] ] cite journal | author= A. Kryszczyńska et al| title= "CCD Photometry of Seven Asteroids: New Spin Axis and Shape Determinations"| journal= Icarus| year= 1996| volume= 124| pages= 134| doi= 10.1006/icar.1996.0194]
mass=~5×10¹⁵ "(estimate)"
density=~2.7 g/cm³ "(estimate)" cite journal | author= G. A. Krasinsky et al| title= "Hidden Mass in the Asteroid Belt"| journal= Icarus| year= 2002| volume= 158| pages= 98| doi= 10.1006/icar.2002.6837]
gravity=~0.006 m/s² "(estimate)"
escape_velocity=~0.009 km/s "(estimate)"
rotation=0.180 d (4.32 h) [http://www.psi.edu/pds/archive/lc.html PDS lightcurve data] ]
spectral_class=S [http://www.psi.edu//pds/resource/taxonomy.html PDS spectral class data] ]
abs_mag=11.45
albedo=0.208
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. This gives an axial tilt of about 35° in both cases.

References