391 Ingeborg

391 Ingeborg

Discovery
Discovered by	Max Wolf
Discovery date	November 1, 1894
Designations
Alternative names	1894 BE
Minor planet category	Mars crosser
Orbital characteristics
Epoch 30 January 2005 (JD 2453400.5)
Aphelion	453.512 Gm (3.032 AU)
Perihelion	240.489 Gm (1.608 AU)
Semi-major axis	347.0 Gm (2.32 AU)
Eccentricity	0.307
Orbital period	1290.318 d (3.53 a)
Average orbital speed	19.09 km/s
Mean anomaly	90.212°
Inclination	23.17°
Longitude of ascending node	213.006°
Argument of perihelion	146.554°
Physical characteristics
Dimensions	18 - 40 km
Mass	unknown
Mean density	unknown
Surface gravity	unknown
Escape velocity	unknown
Rotation period	26.4 h
Albedo	unknown
Temperature	unknown
Spectral type	S
Absolute magnitude (H)	10.8

391 Ingeborg is a relatively large Mars-crossing asteroid that was discovered by Max Wolf on November 1, 1894 at Heidelberg observatory. When discovered the asteroid was observed for a couple of weeks, and follow-up observations were made in 1901 and 1904.

With an absolute magnitude of 10.8, the asteroid is about 18–40 km in diameter. Other large Mars crossing minor planets include 132 Aethra (43km), 323 Brucia (36km), and 2204 Lyyli (25km).

External links

• AstDys entry on 391 Ingeborg
• 391 Ingeborg at the JPL Small-Body Database

• Discovery · Orbit diagram · Orbital elements · Physical parameters

• telnet://ssd.jpl.nasa.gov:6775 telnet for JPL Horizons, easier and more comprehensive than web version