| 词条 | 283 Emma |
| 释义 |
| minorplanet = yes | background = #D6D6D6 | name = 283 Emma | image = 283Emma (Lightcurve Inversion).png | image_size = 265 | caption = A three-dimensional model of 283 Emma based on its light curve | discoverer = Auguste Charlois | discovered = 8 February 1889 | mpc_name = (283) Emma | alt_names = | mp_category = Main belt (Emma) | epoch = 31 July 2016 (JD 2457600.5) | semimajor = {{Convert|3.04688|AU|Gm|abbr=on}} | perihelion = {{Convert|2.59675|AU|Gm|abbr=on}} | aphelion = {{Convert|3.49701|AU|Gm|abbr=on|lk=on}} | eccentricity = 0.14773 | period = 5.32 yr (1942.6 d) | inclination = 7.99162° | asc_node = 304.369° | arg_peri = 53.7020° | mean_anomaly = 127.107° | avg_speed = 17.07 km/s | satellites = 1 (9±5 km)[1] | dimensions = {{val|148.06|4.6|ul=km}} {{small|(IRAS)}} 160±10 km (AO)[1] | mass = 1.38{{e|18}} kg[1] | density = 0.81±0.08 g/cm³[1] | rotation = {{Convert|6.896|h|d|abbr=on|lk=on}} | spectral_type = | abs_magnitude = 8.72 | albedo = {{val|0.0262|0.002}} (Dark) | mean_motion = {{Deg2DMS|0.185319|sup=ms}} / day | orbit_ref = | observation_arc = 122.26 yr (44655 d) | uncertainty = 0 }}Emma (minor planet designation: 283 Emma) is a large asteroid of the asteroid belt and the namesake of the Emma family. It was discovered by Auguste Charlois on 8 February 1889, in Nice, France. The reason for its name is unknown.[2] Measurements made with the IRAS observatory give a diameter of 145.70 ± 5.89 km and a geometric albedo of 0.03 ± 0.01. By comparison, the MIPS photometer on the Spitzer Space Telescope gives a diameter of 145.44 ± 7.72 km and a geometric albedo of 0.03 ± 0.01. When the asteroid was observed occulting a star, the results showed a diameter of 148.00 ± 16.26 km.[11] SatelliteA companion for 283 Emma was detected on 14 July 2003 by W. J. Merline et al. using the Keck II telescope and is designated S/2003 (283) 1. The announcement is contained in the International Astronomical Union Circular (IAUC) 8165.[3] The satellite orbits at a semi-major axis of about 581 km with an eccentricity of 0.12.[1] Emma has a hill sphere with a radius of about 28,000 km.[1] References1. ^1 {{cite web |title=Recent Asteroid Mass Determinations |publisher=Personal Website |author=Jim Baer |url=http://home.earthlink.net/~jimbaer1/astmass.txt |date=2010-12-12 |accessdate=2015-07-17}} [4][5]2. ^{{cite book|author=Lutz D. Schmadel|title=Dictionary of Minor Planet Names|url=https://books.google.com/books?id=KWrB1jPCa8AC|edition=5th|year=2003|publisher=Springer Science & Business Media|isbn=978-3-540-00238-3|page=40}} 3. ^S/2003 (283) 1 (Circular No. 8165) 4. ^1 2 3 4 {{cite journal |last=Marchis |first=Franck |author2=P. Descamps |author3=J. Berthier |author4=D. hestroffer |author5=F. vachier |author6=M. Baek |author7=A. Harris |author8=D. Nesvorny |title=Main Belt Binary Asteroidal Systems With Eccentric Mutual Orbits |journal=Icarus |volume=195 |issue=1 |pages=295–316 |date=2008 |doi=10.1016/j.icarus.2007.12.010 |arxiv=0804.1385 |bibcode=2008Icar..195..295M}} 5. ^1 {{cite arxiv | first1 = Erin Lee | last1 = Ryan | first2 = Donald R. | last2 = Mizuno | first3 = Sachindev S. | last3 = Shenoy | first4 = Charles E. | last4 = Woodward | first5 = Sean | last5 = Carey | first6 = Alberto | last6 = Noriega-Crespo | first7 = Kathleen E. | last7 = Kraemer | first8 = Stephan D. | last8 = Price | display-authors = 1 | title = The Kilometer-Sized Main Belt Asteroid Population as Revealed by Spitzer |date=April 2012 | postscript= .|eprint = 1204.1116 | mode = CS2 | class = astro-ph.EP }} }} External links
7 : Emma asteroids|Discoveries by Auguste Charlois|Minor planets with names of unknown origin|Named minor planets|Binary asteroids|X-type asteroids (Tholen)|Astronomical objects discovered in 1889 |
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