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 [1] | |
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
[1] 147.2×126.6 km 123.41 ± 6.30 km [2] |
Mass | (9.18 ± 0.80) × 1018 kg [2] |
Mean
density | 9.32 ± 1.64 g/cm3 [2] |
6.572 h (0.2738 d) | |
0.0609±0.003 | |
C | |
8.25 | |
381 Myrrha is a main-belt asteroid that was discovered by the French astronomer Auguste Charlois on January 10, 1894, in Nice. [3] 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. [4]
10 μ radiometric data collected from Kitt Peak in 1975 gave a diameter estimate of 126 km. [5] 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.