Minorplanet: | yes |
Background: |
|
249 Ilse | |
Discovered: | 16 August 1885 |
Mpc Name: | (249) Ilse |
Alt Names: | A885 QA, 1973 PB |
Pronounced: | in German ˈɪlzə/[1] |
Epoch: | 31 July 2016 (JD 2457600.5) |
Semimajor: | 2.37721AU |
Perihelion: | 1.85992AU |
Aphelion: | 2.8945abbr=onNaNabbr=on |
Eccentricity: | 0.21760 |
Period: | 3.67 yr (1338.8 d) |
Inclination: | 9.61979° |
Asc Node: | 334.727° |
Arg Peri: | 42.3241° |
Avg Speed: | 19.31 km/s |
Rotation: | 84.94abbr=onNaNabbr=on |
Abs Magnitude: | 11.33 |
Single Temperature: | unknown |
Mean Motion: | / day |
Orbit Ref: | [2] |
Observation Arc: | 130.59 yr (47699 d) |
Uncertainty: | 0 |
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.[3]