(591) Irmgard
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Asteroid (591) Irmgard |
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| Properties of the orbit ( animation ) | |
| Orbit type | Middle main belt |
| Major semi-axis | 2.68 AU |
| eccentricity | 0.207 |
| Perihelion - aphelion | 2.125 AU - 3.235 AU |
| Inclination of the orbit plane | 12.5 ° |
| Length of the ascending node | 334.3 ° |
| Argument of the periapsis | 217.6 ° |
| Time of passage of the perihelion | September 2, 2011 |
| Sidereal period | 4 a 141 d |
| Mean orbital velocity | 18.0 km / s |
| Physical Properties | |
| Medium diameter | 51.86 km |
| Albedo | 0.0364 |
| Rotation period | 7 h 21 min |
| Absolute brightness | 10.64 mag |
| Spectral class | X |
| history | |
| Explorer | August Kopff |
| Date of discovery | March 14, 1906 |
| Another name | 1906 TP, 1954 EM, 1955 ML 1 |
| Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items. | |
(591) Irmgard is an asteroid of the main belt that was discovered by August Kopff in Heidelberg on March 14, 1906 .
The origin of the name is unknown.