| 词条 | 113 Amalthea |
| 释义 |
| minorplanet=yes | background=#D6D6D6 | name=113 Amalthea | discoverer=R. Luther | discovery_site= Bilk Obs. | discovered=12 March 1871 | mpc_name=(113) Amalthea | alt_names= | pronounced={{IPAc-en|æ|m|əl|'|θ|iː|ə}} | named_after=Amalthea | mp_category=main-belt{{·}}Flora | orbit_ref= | epoch=31 July 2016 (JD 2457600.5) | observation_arc=144.90 yr (52926 d) | uncertainty=0 | semimajor={{Convert|2.37598|AU|Gm|abbr=on}} | perihelion={{Convert|2.17010|AU|Gm|abbr=on}} | aphelion={{Convert|2.5819|AU|Gm|abbr=on|lk=on}} | eccentricity=0.086651 | period=3.66 yr (1337.7 d) | inclination=5.0422° | asc_node=123.486° | arg_peri=79.118° | mean_anomaly=226.48° | mean_motion={{Deg2DMS|0.26912|sup=ms}} / day | satellites = 1[2] | mean_diameter={{val|46.14|1.4|ul=km}} | rotation={{Convert|9.950|h|d|abbr=on|lk=on}} | albedo={{val|0.2649|0.017}} | spectral_type=S | abs_magnitude=8.74 }} 113 Amalthea ({{IPAc-en|æ|m|əl|'|θ|iː|ə}}) is a stony Florian asteroid and binary system from the inner regions of the asteroid belt, approximately {{convert|50|km|mi|abbr=off|sp=us}} in diameter. It was discovered on 12 March 1871, by German astronomer Robert Luther at the Bilk Observatory in Düsseldorf, Germany. The elongated S-type asteroid has a rotation period of 9.95 hours. It was named after Amalthea from Greek mythology. The discovery of its 5-kilometer satellite was announced in July 2017. DescriptionAmalthea is thought to be a fragment from the mantle of a Vesta-sized, 300–600 km diameter parent body that broke up around one billion years ago, with the other major remnant being 9 Metis.[3] The spectrum of Amalthea reveals the presence of the mineral olivine, a relative rarity in the asteroid belt.[4][5]Based on observations made during a stellar occultation by Amalthea of a 10th-magnitude star on 14 March 2017, it was announced in July 2017 that the asteroid has a small, 5-kilometer-sized satellite, provisionally designated S/2017 (113) 1. The observations also indicated that Amalthea has a distinctly elongated shape.[1] One of Jupiter's inner small satellites, unrelated to 113 Amalthea, is also called Amalthea, as is an (apparently fictional) small Arjuna asteroid in Neal Stephenson's 2015 novel Seveneves. References1. ^1 {{cite web|last1=Beatty|first1=Kelly|title=Amateur Observers Find an Asteroid’s Moon|url=http://www.skyandtelescope.com/astronomy-news/amateur-observers-discover-asteroid-moon/|website=Sky & Telescope|accessdate=15 July 2017}} [2][3][4]2. ^1 {{Citation | first1 = Michael S. | last1 = Kelley | first2 = Michael J. | last2 = Gaffey | title = 9 Metis and 113 Amalthea: A Genetic Asteroid Pair | work = Icarus | volume = 35 | issue = 144 | pages = 27–38 |date=March 2000 | doi = 10.1006/icar.1999.6266 | bibcode = 2000Icar..144...27K | postscript= .}} 3. ^1 {{Citation | first1 = E. A. | last1 = Cloutis | title = Olivine-rich asteroids, pallasitic olivine and olivine-metal mixtures: Comparisons of reflectance spectra | work = Lunar and Planetary Institute, Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F | pages = 317–318 |date=March 1993 | bibcode = 1993LPI....24..317C | postscript= .}} 4. ^1 {{Citation | first1 = T. H. | last1 = Burbine | first2 = E. | last2 = Bowden | first3 = T. | last3 = Ogura | first4 = R. P. | last4 = Binzel | first5 = S. J. | last5 = Bus | first6 = T. J. | last6 = McCoy | first7 = K. | last7 = Kondo | display-authors = 1 | title = The Nature of Olivine Asteroids | work = Meteoritics & Planetary Science | volume = 35 | pages = A35 |date=July 2000 | bibcode = 2000M&PSA..35R..35B | postscript= . | doi = 10.1111/j.1945-5100.2000.tb01796.x}} }} External links
9 : Flora asteroids|Discoveries by Robert Luther|Minor planets named from Greek mythology|Named minor planets|Objects observed by stellar occultation|Binary asteroids|S-type asteroids (SMASS)|S-type asteroids (Tholen)|Astronomical objects discovered in 1871 |
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