Edna (minor planet designation: 445 Edna) is a large Main belt asteroid.
Discovery | |
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Discovered by | E. F. Coddington |
Discovery date | 2 October 1899 |
Designations | |
MPC designation | (445) Edna |
Pronunciation | /ˈɛdnə/[1] |
Alternative designations | 1899 EX |
Minor planet category | Main belt |
Orbital characteristics[2] | |
Epoch 31 July 2016 (JD 2457600.5) | |
Uncertainty parameter 0 | |
Observation arc | 116.53 yr (42563 d) |
Aphelion | 3.82552 AU (572.290 Gm) |
Perihelion | 2.57569 AU (385.318 Gm) |
Semi-major axis | 3.20060 AU (478.803 Gm) |
Eccentricity | 0.19525 |
Orbital period (sidereal) | 5.73 yr (2091.4 d) |
Mean anomaly | 190.102° |
Mean motion | 0° 10m 19.668s / day |
Inclination | 21.2944° |
Longitude of ascending node | 292.111° |
Argument of perihelion | 81.2763° |
Physical characteristics | |
Dimensions | 87.17±2.1 km[2] 88.60 ± 4.10 km[3] |
Mass | (3.47 ± 0.78) × 1018 kg[3] |
Mean density | 9.52 ± 2.50 g/cm3[3] |
Synodic rotation period | 19.97 h (0.832 d) |
Geometric albedo | 0.0447±0.002 |
Absolute magnitude (H) | 9.29 |
It was discovered by E. F. Coddington on October 2, 1899, at Mount Hamilton, California. It was the astronomer's third and final asteroid discovery.
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