{{Short description|Main-belt asteroid}} {{Use dmy dates|date=October 2019}} {{Infobox planet | minorplanet=yes | background=#D6D6D6 | name=381 Myrrha | image= Myrrha en la Constelación de Leo.jpg | symbol = 24px|Symbol for Myrrha: a woman turned into a tree, with tears / drops of myrrh | caption=381 Myrrha photographed in the constellation of Leo, with Messier 65, Messier 66 and NGC 3628 nearby | discoverer=Auguste Charlois | discovered=10 January 1894 | mpc_name=(381) Myrrha | pronounced={{IPAc-en|'|m|ɪr|ə|,_|'|m|ɜːr|ə}} | alt_names=1894 AS | named_after=Myrrha | mp_category=Main belt | orbit_ref=<ref name="JPL"/> | epoch=31 July 2016 (JD 2457600.5) | semimajor={{Convert|3.22298|AU|Gm|abbr=on}} | perihelion={{Convert|2.93357|AU|Gm|abbr=on}} | aphelion={{Convert|3.5124|AU|Gm|abbr=on|lk=on}} | 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={{val|120.58|2.7|ul=km}}<ref name="JPL"/><br />147.2×126.6 km<br />123.41 ± 6.30 km<ref name="Carry2012"/> | mass={{nowrap|(9.18 ± 0.80) × 10<sup>18</sup> kg<ref name="Carry2012"/>}} | density=9.32 ± 1.64 g/cm<sup>3</sup><ref name="Carry2012"/> | rotation={{Convert|6.572|h|d|abbr=on|lk=on}} | spectral_type=C | abs_magnitude=8.25 | albedo={{val|0.0609|0.003}} | mean_motion={{Deg2DMS|0.170340|sup=ms}} / 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.<ref name="IAU_MPC"/> 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.<ref name="Warner2008"/>

10μ radiometric data collected from Kitt Peak in 1975 gave a diameter estimate of 126&nbsp;km.<ref name="Morrison1976"/> 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== {{Reflist|refs=

<ref name="JPL">{{Citation | first1 = Donald K. | last1 = Yeomans | title = 381 Myrrha | work = JPL Small-Body Database Browser | publisher = NASA Jet Propulsion Laboratory | url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=381 | access-date= 10 May 2016 | postscript= . }}</ref>

<ref name="IAU_MPC">{{Citation | title = Numbered Minor Planets 1–5000 | work = Discovery Circumstances | publisher = IAU Minor Planet center | url = https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html | access-date= 2013-04-07 | postscript= . }}</ref>

<ref name="Carry2012">{{Citation | first1 = B. | last1 = Carry | title = Density of asteroids | work = Planetary and Space Science | volume = 73 | pages = 98–118 |date=December 2012 | doi = 10.1016/j.pss.2012.03.009 | bibcode = 2012P&SS...73...98C | postscript= . |arxiv = 1203.4336 }} See Table 1.</ref>

<ref name="Morrison1976">{{Citation | last1 = Morrison | first1 = D. | last2 = Chapman | first2 = C. R. | title = Radiometric diameters for an additional 22 asteroids | work = Astrophysical Journal | volume = 204 | pages = 934–939 |date=March 1976 | doi = 10.1142/9789812834300_0469 | bibcode = 2008mgm..conf.2594S | postscript= . | isbn = 978-981-283-426-3 }}</ref>

<ref name="Warner2008">{{Citation | last1 = Ditteon | first1 = Richard | last2 = Hawkins | first2 = Scot | title = Asteroid Lightcurve Analysis at the Oakley Observatory - October-November 2006 | work = The Minor Planet Bulletin | volume = 34 | issue = 3 | pages = 59–64 |date=September 2007 | bibcode = 2007MPBu...34...59D | postscript= . }}</ref>

}} [[File:381 Myrrha.png|thumb|Lightcurve-base 3D-model of 381 Myrrh.]]<!-- end of reflist -->

==External links== * [http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1993AJ....105.1553S&amp;db_key=AST The occultation of gamma Geminorum by the asteroid 381 Myrrha] * {{AstDys|381}} * {{JPL small body}}

{{Minor planets navigator |380 Fiducia |number=381 |382 Dodona}} {{Small Solar System bodies}} {{Authority control}}

{{DEFAULTSORT:000381}} Category:Background asteroids Myrrha Myrrha Category:C-type asteroids (Tholen) Category:Cb-type asteroids (SMASS) 18940110

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