381 Myrrha
381 Myrrha photographed in the constellation of Leo, with Messier 65, Messier 66 and NGC 3628 nearby | |
| Discovery | |
|---|---|
| Discovered by | Auguste Charlois |
| Discovery date | 10 January 1894 |
| Designations | |
| (381) Myrrha | |
| Pronunciation | /ˈmɪrə, ˈmɜːrə/ |
Named after | Myrrha |
| 1894 AS | |
| Main belt | |
| Symbol | |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 122.27 yr (44658 d) |
| Aphelion | 3.5124 AU (525.45 Gm) |
| Perihelion | 2.93357 AU (438.856 Gm) |
| 3.22298 AU (482.151 Gm) | |
| Eccentricity | 0.089797 |
| 5.79 yr (2113.4 d) | |
| 350.739° | |
| 0° 10m 13.224s / day | |
| Inclination | 12.558° |
| 125.102° | |
| 142.930° | |
| Physical characteristics | |
| Dimensions | 120.58±2.7 km 147.2×126.6 km 123.41 ± 6.30 km |
| Mass | (9.18 ± 0.80) × 1018 kg |
Mean density | 9.32 ± 1.64 g/cm3 |
| 6.572 h (0.2738 d) | |
| 0.0609±0.003 | |
| C | |
| 8.25 | |
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381 Myrrha is a main-belt asteroid that was discovered by the French astronomer Auguste Charlois on January 10, 1894, in Nice. It has been classified as a C-type asteroid and is most likely composed of carbonaceous material.
Photometric observations of this asteroid at the Oakley Observatory in Terre Haute, Indiana during 2006 gave a light curve with a period of 6.572 ± 0.002 hours and a brightness variation of 0.34 ± 0.05 in magnitude.
10μ radiometric data collected from Kitt Peak in 1975 gave a diameter estimate of 126 km. The occultation of Alhena (γ Geminorum) by Myrrha was observed in Japan and China on January 13, 1991, allowing the size and shape of Myrrha to be properly clarified.