3258 Somnium
asteroid
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Summary
3258 Somnium is an asteroid[1].
Key Facts
- Discoverer or inventor: Paul Wild[2]
- Site of astronomical discovery: Zimmerwald Observatory[3]
- Named after: Somnium[4]
- Follows: 3257 Hanzlík[5]
- Followed by: 3259 Brownlee[6]
- Minor planet group: asteroid belt[7]
- Parent astronomical body: Sun[8]
- Provisional designation: 1979 HF3[9], 1980 YG[10], 1983 RJ[11]
- Time of discovery or invention: September 8, 1983[12]
- Asteroid spectral type: S-type asteroid[13]
- Significant event: naming[14]
- Orbital eccentricity: 0.20[15], 0.1966587[16], 0.196217083307157[17]
- Absolute magnitude: 13.2[18], 13.3[19]
- Orbital inclination: 7.55516 degree[20], 7.552678026891867 degree[21]
- Orbital period: 3.28 years[22], 1196.858970825814 day[23]
- Rotation period: 5.3379 hour[24]
- Longitude of ascending node: 45.01220 degree[25], 44.98185523383627 degree[26]
- Semi-major axis of an orbit: 2.2058180 astronomical unit[27], 2.206122894488269 astronomical unit[28]
- Apoapsis: 2.640 astronomical unit[29], 2.6390018942619 astronomical unit[30]
- Periapsis: 1.7720247 astronomical unit[31], 1.773243894714638 astronomical unit[32]
- Argument of periapsis: 296.90852 degree[33], 296.8286554754209 degree[34]
- Mean anomaly: 201.34304 degree[35], 323.6418212664213 degree[36]
- Epoch: November 21, 2025[37]
- Time of periapsis: 2461121.376701056 Julian day[38]