381 Myrrha

381 Myrrha
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
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)
Semi-major axis	3.22298 AU (482.151 Gm)
Eccentricity	0.089797
Orbital period	5.79 yr (2113.4 d)
Mean anomaly	350.739°
Mean motion	0° 10m 13.224s / day
Inclination	12.558°
Longitude of ascending node	125.102°
Argument of perihelion	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]
Rotation period	6.572 h (0.2738 d)
Geometric albedo	0.0609±0.003
Spectral type	C
Absolute magnitude (H)	8.25

Myrrha (minor planet designation: 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 10 May 2016.
Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 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, 34 (3), pp. 59–64, Bibcode:2007MPBu...34...59D.
Morrison, D.; Chapman, C. R. (March 1976), "Radiometric diameters for an additional 22 asteroids", Astrophysical Journal, 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
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
381 Myrrha at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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[JPL-1] Yeomans, Donald K., "381 Myrrha", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 10 May 2016.

[Carry2012-2] Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.

[IAU_MPC-3] "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 7 April 2013.

[Warner2008-4] Ditteon, Richard; Hawkins, Scot (September 2007), "Asteroid Lightcurve Analysis at the Oakley Observatory - October-November 2006", The Minor Planet Bulletin, 34 (3), pp. 59–64, Bibcode:2007MPBu...34...59D.

[Morrison1976-5] Morrison, D.; Chapman, C. R. (March 1976), "Radiometric diameters for an additional 22 asteroids", Astrophysical Journal, 204, pp. 934–939, Bibcode:2008mgm..conf.2594S, doi:10.1142/9789812834300_0469, ISBN 978-981-283-426-3.