Tags: Planet.

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.

apoapsis (km)
4.32742e+11
average speed (km/s)
69516.0
orbital period (μ)
1.15811e+08
periapsis (km)
2.79103e+11
absolute magnitude
11.33
albedo
0.043
discovery date
1885-08-16
discoverer
Christian Heinrich Friedrich Peters
epoch
30 January 2005 (JD 2453400.5)
former name
1973 PB
rotation period (s)
306864.0

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