Discovery | |
---|---|
Discovered by | Johann Palisa |
Discovery date | 25 April 1890 |
Designations | |
(291) Alice | |
A890 HA, 1954 UJ3 | |
main-belt | |
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) | |
115.293° | |
0° 17m 51.382s / day | |
Inclination | 1.8555° |
161.655° | |
331.580° | |
Physical characteristics | |
Dimensions | 14.97±1.1 km [1] 19×12×11 km [2][3] |
Mass | ~ |
Mean density | ~2.7 g/cm3[4] |
4.313 h (0.1797 d) [1] 0.180 d (4.32 h) [5] | |
0.2075±0.033 [1] 0.208 [2] | |
S [6] | |
11.45 | |
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.
JPL
was invoked but never defined (see the help page).Oey2006
was invoked but never defined (see the help page).