| 词条 | 980 Anacostia |
| 释义 |
| minorplanet= yes | background= #D6D6D6 | name= 980 Anacostia | mpc_name= (980) Anacostia | alt_names= 1921 W19 | discoverer= George Henry Peters | discovery_site= Washington, D.C. | discovered= 21 November 1921 | orbit_ref= | observation_arc= 87.01 yr (31782 days) | uncertainty= 0 | epoch= 31 July 2016 (JD 2457600.5) | eccentricity= 0.20278 | semimajor= {{Convert|2.7397|AU|Gm|abbr=on}} | perihelion= {{Convert|2.1842|AU|Gm|abbr=on}} | aphelion= {{Convert|3.2953|AU|Gm|abbr=on|lk=on}} | period= 4.53 yr (1656.4 d) | inclination= 15.905° | asc_node= 285.817° | arg_peri= 70.143° | mean_anomaly= 317.515° | mean_motion= {{Deg2DMS|0.21734|sup=ms}} / day | abs_magnitude= 7.85 | rotation= {{Convert|20.117|h|d|abbr=on|lk=on}} | albedo= {{val|0.1723|0.006}} | mean_radius= {{val|43.095|0.8}} km }} 980 Anacostia is a minor planet orbiting the Sun that was discovered by American astronomer George Henry Peters on November 21, 1921. The name recognizes the Anacostia River and an historic neighborhood of the same name in the city of Washington D.C. Measurements using the adaptive optics system at the W. M. Keck Observatory give a diameter of 70 ± 6 km. This is 23% smaller than the diameter estimated from the IRAS observatory data. The size ratio between the major and minor axes is 1.09.[2] Polarimetric study of this asteroid reveals anomalous properties that suggests the regolith consists of a mixture of low and high albedo material. This may have been caused by fragmentation of an asteroid substrate with the spectral properties of CO3/CV3 carbonaceous chondrites.[3]References1. ^1 {{Citation | first1 = F. | last1 = Marchis | first2 = M. | last2 = Kaasalainen | first3 = E. F. Y. | last3 = Hom | first4 = J. | last4 = Berthier | first5 = J. | last5 = Enriquez | first6 = D. | last6 = Hestroffer | first7 = D. | last7 = Le Mignant | first8 = I. | last8 = de Pater | display-authors = 1 | title = Shape, size and multiplicity of main-belt asteroids. I. Keck Adaptive Optics survey | work = Icarus | volume = 185 | issue = 1 | pages = 39–63 | date = November 2006 | url = http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006Icar..185...39M&link_type=EJOURNAL&db_key=AST&high= | accessdate= 2013-03-27 | bibcode = 2006Icar..185...39M | doi = 10.1016/j.icarus.2006.06.001 | postscript= . | pmid=19081813 | pmc=2600456}} [1][2]2. ^1 {{Citation | last1 = Gil-Hutton | first1 = R. | last2 = Mesa | first2 = V. | last3 = Cellino | first3 = A. | last4 = Bendjoya | first4 = P. | last5 = Peñaloza | first5 = L. | last6 = Lovos | first6 = F. | display-authors = 1 | title = New cases of unusual polarimetric behavior in asteroids | work = Astronomy and Astrophysics | volume = 482 | issue = 1 | pages = 309–314 |date=April 2008 | doi = 10.1051/0004-6361:20078965 | bibcode = 2008A&A...482..309G | postscript= .}} }} External links
7 : Background asteroids|Discoveries by George Peters|Minor planets named for places|Named minor planets|SU-type asteroids (Tholen)|L-type asteroids (SMASS)|Astronomical objects discovered in 1921 |
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