381 Myrrha

381 Myrrha
Discovery
Discovered by Auguste Charlois
Discovery date January 10, 1894
Designations
Named after
 Myrrha
1894 AS
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)
481.534 Gm (3.219 AU)
Eccentricity 0.095
2109.318 d (5.77 a)
16.6 km/s
0.901°
Inclination 12.527°
125.354°
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
8.25

    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

    1. ↑ Yeomans, Donald K., "381 Myrrha", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-03-30.
    2. ↑ 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.
    3. ↑ "Numbered Minor Planets 1–5000", Discovery Circumstances (IAU Minor Planet center), retrieved 2013-04-07.
    4. ↑ 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.
    5. ↑ 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.

    External links