33 Polyhymnia

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33 Polyhymnia
Discovery
Discovered by J. Chacornac
Discovery date October 28, 1854
Designations
Alternative names A887 HA; 1938 FE;
1953 AK; 1957 YL;
1963 DG; 1976 YT7
Minor planet
category		 Main belt
Epoch December 31, 2006 (JD 2454100.5)
Aphelion 573.325 Gm (3.832 AU)
Perihelion 283.846 Gm (1.897 AU)
Semi-major axis 428.585 Gm (2.865 AU)
Eccentricity 0.338
Orbital period 1771.195 d (4.85 a)
Average orbital speed 17.08 km/s
Mean anomaly 148.947°
Inclination 1.871°
Longitude of ascending node 8.590°
Argument of perihelion 338.240°
Physical characteristics
Dimensions 50-120 km [1]
Mass 1.3-18.0×1017 kg
Mean density 2.0? g/cm³
Equatorial surface gravity 0.014-0.033 m/s²
Escape velocity 0.026-0.063 km/s
Rotation period 0.77504 d (18.601 h) [2]
Albedo 0.10?
Temperature ~164 K
Spectral type S
Absolute magnitude 8.55

33 Polyhymnia (IPA: /ˌpɒliˈhɪmniə/) is a main belt asteroid.

It was discovered by J. Chacornac on October 28, 1854 and named after Polyhymnia, the Greek Muse of sacred hymns.

[edit] References

  1. ^ Conversion of Absolute Magnitude to Diameter
  2. ^ [1][dead link]
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