| Minorplanet | yes |
|---|---|
| Background |
|
| Discoverer | Auguste Charlois |
| Discovered | 10 January 1894 |
| Mpc name | (381) Myrrha |
| Pronounced | /mɪrə,_mɜːrə/ |
| Alt names | 1894 AS |
| Named after | Myrrha |
| Mp category | Main belt |
| Epoch | 31 July 2016 (JD 2457600.5) |
| Semimajor | 3.22298 AU (482.151 Gm) |
| Perihelion | 2.93357 AU (438.856 Gm) |
| Aphelion | 3.5124 AU (525.45 Gm) |
| Eccentricity | 0.089797 |
| Period | 5.79 yr (2113.4 d) |
| Inclination | 12.558° |
| Asc node | 125.102° |
| Arg peri | 142.930° |
| Mean anomaly | 350.739° |
| 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] |
| Density | 9.32 ± 1.64 g/cm3[2] |
| Rotation | 6.572 h |
| Abs magnitude | 8.25 |
| Albedo | 0.0609 ± 0.003 |
| Mean motion | / day |
| Observation arc | 122.27 yr (44658 d) |
| Uncertainty | 0 |
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]
10μ 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.
References
- ^ Yeomans, Donald K., "381 Myrrha", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 10 May 2016
- ^ Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science. Vol. 73, pp. 98–118, arXiv:1203.4336. Bibcode:2012P&SS...73...98C. doi:10.1016/j.pss.2012.03.009 See Table 1.
- ^ "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 2013-04-07
- ^ Ditteon, Richard & Hawkins, Scot (September 2007), "Asteroid Lightcurve Analysis at the Oakley Observatory - October-November 2006", The Minor Planet Bulletin. Vol. 34, no. 3, pp. 59–64, Bibcode:2007MPBu...34...59D
- ^ Morrison, D. & Chapman, C. R. (March 1976), "Radiometric diameters for an additional 22 asteroids", Astrophysical Journal. Vol. 204, pp. 934–939, Bibcode:2008mgm..conf.2594S. doi:10.1142/9789812834300_0469. ISBN 978-981-283-426-3