249 Ilse

From Wikipedia, the free encyclopedia

249 Ilse
Discovery A
Discoverer C. H. F. Peters
Discovery date August 16, 1885
Alternate
designations B		 1973 PB
Category Main belt
Orbital elements C
Epoch 30 January 2005 (JD 2453400.5)
Eccentricity (e) 0.216
Semi-major axis (a) 355.922 Gm (2.379 AU)
Perihelion (q) 279.103 Gm (1.866 AU)
Aphelion (Q) 432.742 Gm (2.893 AU)
Orbital period (P) 1340.402 d (3.67 a)
Mean orbital speed 19.31 km/s
Inclination (i) 9.629°
Longitude of the
ascending node (Ω)		 334.851°
Argument of
perihelion (ω)		 41.91°
Mean anomaly (M) 175.357°
Physical characteristics D
Dimensions 35.0 km
Mass unknown
Density unknown
Surface gravity unknown
Escape velocity unknown
Rotation period 85.24 h
Spectral class unknown
Absolute magnitude 11.33
Albedo (geometric) 0.043
Mean surface
temperature		 unknown
This box: view • talk • edit

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. No evidence of it has been provided, however.[1]

[edit] References

v • d • e
Minor planets navigator

248 Lameia       ·       249 Ilse       ·       250 Bettina
v • d • e
Small Solar System bodies
Lists: Minor planets · Asteroid groups and families · Binary asteroids · Asteroid moons
See also: Near-Earth object · Dwarf planet · Planet · Solar System · Pronunciation of asteroid names · Meanings of asteroid names.