33 Polyhymnia
Polyhymnia (minor planet designation: 33 Polyhymnia) is a main belt asteroid that was discovered by French astronomer Jean Chacornac on October 28, 1854 and named after Polyhymnia, the Greek Muse of sacred hymns.
Orbit of 33 Polyhymnia (1 Jan 2009) | |
| Discovery | |
|---|---|
| Discovered by | J. Chacornac |
| Discovery date | October 28, 1854 |
| Designations | |
MPC designation | (33) Polyhymnia |
| Pronunciation | /pɒliˈhɪmniə/ |
Named after | Polyhymnia |
Alternative designations | A887 HA; 1938 FE; 1953 AK; 1957 YL; 1963 DG; 1976 YT7 |
Minor planet category | Main belt |
| Orbital characteristics | |
| Epoch April 18, 2013 (JD 2456400.5) | |
| Aphelion | 573.518 Gm (3.83373 AU) |
| Perihelion | 284.409 Gm (1.90116 AU) |
Semi-major axis | 428.964 Gm (2.86745 AU) |
| Eccentricity | 0.33698 |
Orbital period (sidereal) | 1,773.541 d (4.86 a) |
Mean anomaly | 256.476° |
| Inclination | 1.869° |
Longitude of ascending node | 8.595° |
| 338.123° | |
| Physical characteristics | |
| Dimensions | 54.39±11.84 km (infrared) 53.98±0.91 km 64±6 km (occultation) |
Synodic rotation period | 18.60888±0.00029 h |
| S or Sq | |
| 8.55 | |
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