381 Myrrha
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| Discovery | |
|---|---|
| Discovered by | Auguste Charlois |
| Discovery date | January 10, 1894 |
| Designations | |
| Named after | Myrrha |
| Alternative names | 1894 AS |
| Minor planet category | Main belt |
| Orbital characteristics[1] | |
| Epoch 30 January 2005 (JD 2453400.5) | |
| Aphelion | 527.45 Gm (3.526 AU) |
| Perihelion | 435.617 Gm (2.912 AU) |
| Semi-major axis | 481.534 Gm (3.219 AU) |
| Eccentricity | 0.095 |
| Orbital period | 2109.318 d (5.77 a) |
| Average orbital speed | 16.6 km/s |
| Mean anomaly | 0.901° |
| Inclination | 12.527° |
| Longitude of ascending node | 125.354° |
| Argument of perihelion | 137.241° |
| Physical characteristics | |
| Dimensions |
147.2×126.6 km 123.41 ± 6.30[2] km |
| Mass | (9.18 ± 0.80) × 1018[2] kg |
| Mean density | 9.32 ± 1.64[2] g/cm3 |
| Spectral type | C |
| Absolute magnitude (H) | 8.25 |
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381 Myrrha is a very large main-belt asteroid that was discovered by French astronomer Auguste Charlois on January 10, 1894, in Nice.[3] It is classified as a C-type asteroid and is probably 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 clarified.
References
- ↑ Yeomans, Donald K., "381 Myrrha", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-03-30.
- ↑ 2.0 2.1 2.2 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: 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", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 34 (3): 59–64, Bibcode:2007MPBu...34...59D.
- ↑ Morrison, D.; Chapman, C. R. (March 1976), "Radiometric diameters for an additional 22 asteroids", Astrophysical Journal 204: 934–939, Bibcode:2008mgm..conf.2594S, doi:10.1142/9789812834300_0469.
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