249 Ilse

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249 Ilse
Discovery
Discovered by C. H. F. Peters
Discovery date 16 August 1885
Designations
1973 PB
Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 130.59 yr (47699 d)
Aphelion 2.89450 AU (433.011 Gm)
Perihelion 1.85992 AU (278.240 Gm)
2.37721 AU (355.626 Gm)
Eccentricity 0.21760
3.67 yr (1338.8 d)
19.31 km/s
223.964°
0° 16m 8.065s / day
Inclination 9.61979°
334.727°
42.3241°
Earth MOID 0.871134 AU (130.3198 Gm)
Jupiter MOID 2.6098 AU (390.42 Gm)
Jupiter Tisserand parameter 3.490
Physical characteristics
Dimensions 34.83±1.1 km
Mass unknown
Mean density
unknown
Equatorial surface gravity
unknown
Equatorial escape velocity
unknown
84.94 h (3.539 d)
0.0428±0.003
Temperature unknown
unknown
11.33

249 Ilse is a Main belt asteroid. It has an unusually slow rotation period, about 3.5 days.

It was discovered by C. H. F. Peters on August 16, 1885 in Clinton, New York and was named after Ilse, a legendary German princess.

Due to the long rotation period, a possible asteroidal satellite of Ilse was proposed by R. P. Binzel in 1987 however no evidence of this has been found.[2]

References[edit]

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