(33) Polyhymnia
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Asteroid (33) Polyhymnia |
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| Properties of the orbit ( animation ) | |
| Orbit type | Outer main belt |
| Major semi-axis | 2.865 AU |
| eccentricity | 0.338 |
| Perihelion - aphelion | 1.897 AU - 3.833 AU |
| Inclination of the orbit plane | 1.9 ° |
| Length of the ascending node | 8.6 ° |
| Argument of the periapsis | 338.1 ° |
| Time of passage of the perihelion | November 2, 2009 |
| Sidereal period of rotation | 4 a 309 d |
| Mean orbital velocity | 17.1 km / s |
| Physical Properties | |
| Medium diameter | 65 km |
| Rotation period | 18 h 36 min |
| Absolute brightness | 8.6 likes |
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Spectral class (according to Tholen) |
S. |
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Spectral class (according to SMASSII) |
Sq |
| history | |
| Explorer | Jean Chacornac |
| Date of discovery | October 28, 1854 |
| 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. | |
(33) Polyhymnia is an asteroid of the main belt , which on 28 October 1854 by Jean Chacornac was discovered.
The heavenly body was named after Polyhymnia , the muse of hymn poetry, dance, pantomime and geometry .
Based on the absolute brightness of 8.55 and an albedo of about 0.18 typical for silicate-rich asteroids, a mean diameter of about 65 kilometers can be derived for Polyhymnia. This value is very uncertain due to the range of fluctuation in plausible albedo values. Due to the small size of Polyhymnias, an irregular shape is to be expected, since the natural gravity for the formation of an ellipsoid of revolution should not be sufficient. Due to the fluctuations in brightness due to the rotation due to the irregular shape, a value of 18 hours and 36 minutes was derived for one rotation around its own axis.