 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 | |
| MPC designation | (381) Myrrha |
| Pronunciation | /ˈmɪrə, ˈmɜːrə/ |
| Named after | Myrrha |
| Alternative designations | 1894 AS |
| Minor planet category | Main belt |
| Symbol | .svg){kind=small} |
| 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) |
| Semi-major axis | 3.22298 AU (482.151 Gm) |
| Eccentricity | 0.089797 |
| Orbital period (sidereal) | 5.79 yr (2113.4 d) |
| Mean anomaly | 350.739° |
| Mean motion | 0° 10 13.224 / day |
| Inclination | 12.558° |
| Longitude of ascending node | 125.102° |
| Argument of perihelion | 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) × 10 kg |
| Mean density | 9.32 ± 1.64 g/cm |
| Synodic rotation period | 6.572 h (0.2738 d) |
| Geometric albedo | 0.0609±0.003 |
| Spectral type | C |
| Absolute magnitude (H) | 8.25 |
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.
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 7 April 2013.
- 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.
External links
- The occultation of gamma Geminorum by the asteroid 381 Myrrha
- 381 Myrrha at AstDyS-2, Asteroids—Dynamic Site
- 381 Myrrha at the JPL Small-Body Database
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