| 词条 | 771 Libera |
| 释义 |
| minorplanet = yes | name = 771 Libera | background = #D6D6D6 | image = 771Libera (Lightcurve Inversion).png | image_size = 265 | caption = Lightcurve-based 3-D model of Libera | discovery_ref = [1] | discovered = 21 November 1913 | discoverer = J. Rheden | discovery_site = Vienna Observatory | mpc_name = (771) Libera | alt_names = 1913 TO{{·}}1958 HA | named_after = friend of discoverer[2] | mp_category = main-belt{{·}}{{small|(middle)}} [3] | orbit_ref = [1] | epoch = 31 July 2016 (JD 2457600.5) | uncertainty = 0 | observation_arc = 101.75 yr (37166 d) | aphelion = {{Convert|3.3092|AU|Gm|abbr=on|lk=on}} | perihelion = {{Convert|1.9937|AU|Gm|abbr=on}} | semimajor = {{Convert|2.6514|AU|Gm|abbr=on}} | eccentricity = 0.24808 | period = 4.32 yr (1576.9 d) | mean_anomaly = 268.14° | inclination = 14.936° | asc_node = 218.19° | arg_peri = 227.36° | dimensions = {{val|29.38|1.1}} km {{small|(IRAS:6)}}[1][6] {{val|28.91|0.72}} km[7] {{val|29.000|1.403}} km[8] 29.33 km {{small|(derived)}}[3] | mean_radius = {{val|14.69|0.55}} km | rotation = {{val|5.892|0.002}} h[10] {{val|5.92|}} h[11] {{val|5.886|0.001}} h {{val|5.89|0.05}} h {{val|5.890|0.001}} h[14] {{Convert|5.892|h|d|abbr=on|lk=on}}[1] | albedo = {{val|0.1303|0.010}} {{small|(IRAS:6)}}[1] [6] {{val|0.141|0.008}}[7] {{val|0.1299|0.0158}}[8] 0.1226 {{small|(SIMPS)}}[3] | spectral_type = B–V = 0.687 U–B = 0.300 X {{small|(Tholen)}}, X {{small|(SMASS)}}, X [3] | abs_magnitude = 10.49[1] | mean_motion = {{Deg2DMS|0.22829|sup=ms}} / day | moid = {{Convert|1.03684|AU|Gm|abbr=on}} | jupiter_moid = {{Convert|2.11238|AU|Gm|abbr=on}} | tisserand = 3.299 }}771 Libera, provisional designation 1913 TO, is a metallic asteroid from the middle region of the asteroid belt, about 29 kilometers in diameter. It was discovered by Austrian astronomer Joseph Rheden at the Vienna Observatory in Austria, on 21 November 1913.[23] The metallic X-type asteroid orbits the Sun at a distance of 2.0–3.3 AU once every 4 years and 4 months (1,576 days). Its orbit shows an eccentricity of 0.25 and is tilted by 15 degrees to the plane of the ecliptic. A photometric observation of the asteroid's light-curve performed at the Palmer Divide Observatory during 1999 rendered a rotation period of {{val|5.892|0.002}} hours with a brightness variation of 0.57 magnitude.[10] The result concurs with several previous observations, including a photometric analysis conducted over a twelve-year interval.[11][14] According to the surveys carried out by the Infrared Astronomical Satellite, IRAS, the Japanese Akari satellite, and the U.S. Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid's surface has an albedo of 0.13 and 0.14, respectively, while the Collaborative Asteroid Lightcurve Link publishes a slightly lower figure of 0.12 from an alternative result of the Supplemental IRAS Minor Planet Survey.[3] The minor planet was named by Mrs. Hedwig Rheden in honor of a friend of the discoverer.[2] References1. ^1 2 3 4 5 {{cite web |title=LCDB Data for (771) Libera |publisher=Asteroid Lightcurve Database (LCDB) |url=http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=771%7CLibera |accessdate=4 January 2016}} [1][2][3][4][5][6][7][8][9][10]2. ^1 2 3 4 5 6 {{cite web |type=2015-08-30 last obs. |title=JPL Small-Body Database Browser: 771 Libera (1913 TO) |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000771 |publisher=Jet Propulsion Laboratory |accessdate=5 May 2016}} 3. ^1 2 {{cite book |title=Dictionary of Minor Planet Names – (771) Libera |last=Schmadel |first=Lutz D. |publisher=Springer Berlin Heidelberg |page=73 |date=2003 |isbn=978-3-540-29925-7 |doi=10.1007/978-3-540-29925-7_772 |chapter = (771) Libera}} 4. ^1 {{cite web |title=771 Libera (1913 TO) |work=Minor Planet Center |url=http://www.minorplanetcenter.net/db_search/show_object?object_id=771 |accessdate=4 January 2016}} 5. ^1 2 {{cite journal |first1 = E. F. |last1 = Tedesco |first2 = P. V. |last2 = Noah |first3 = M. |last3 = Noah |first4 = S. D. |last4 = Price |date = October 2004 |title = IRAS Minor Planet Survey V6.0 |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2004PDSS...12.....T |journal = NASA Planetary Data System |volume = 12 |pages = IRAS-A-FPA-3-RDR-IMPS-V6.0 |bibcode = 2004PDSS...12.....T |access-date= 4 January 2016}} 6. ^1 2 {{cite journal |display-authors = 6 |first1 = Fumihiko |last1 = Usui |first2 = Daisuke |last2 = Kuroda |first3 = Thomas G. |last3 = Müller |first4 = Sunao |last4 = Hasegawa |first5 = Masateru |last5 = Ishiguro |first6 = Takafumi |last6 = Ootsubo |first7 = Daisuke |last7 = Ishihara |first8 = Hirokazu |last8 = Kataza |first9 = Satoshi |last9 = Takita |first10 = Shinki |last10 = Oyabu |first11 = Munetaka |last11 = Ueno |first12 = Hideo |last12 = Matsuhara |first13 = Takashi |last13 = Onaka |date = October 2011 |title = Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011PASJ...63.1117U |journal = Publications of the Astronomical Society of Japan |volume = 63 |issue = 5 |pages = 1117–1138 |bibcode = 2011PASJ...63.1117U |doi = 10.1093/pasj/63.5.1117 |access-date= 4 January 2016}} 7. ^1 2 {{cite journal |display-authors = 6 |first1 = A. |last1 = Mainzer |first2 = T. |last2 = Grav |first3 = J. |last3 = Masiero |first4 = E. |last4 = Hand |first5 = J. |last5 = Bauer |first6 = D. |last6 = Tholen |first7 = R. S. |last7 = McMillan |first8 = T. |last8 = Spahr |first9 = R. M. |last9 = Cutri |first10 = E. |last10 = Wright |first11 = J. |last11 = Watkins |first12 = W. |last12 = Mo |first13 = C. |last13 = Maleszewski |date = November 2011 |title = NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...90M |journal = The Astrophysical Journal |volume = 741 |issue = 2 |page = 25 |bibcode = 2011ApJ...741...90M |doi = 10.1088/0004-637X/741/2/90 |access-date= 4 January 2016|arxiv = 1109.6407 }} 8. ^1 2 {{cite journal |author = Binzel, R. P. |date = October 1987 |title = A photoelectric survey of 130 asteroids |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1987Icar...72..135B |journal = Icarus |volume = 72 |issue = 1 |pages = 135–208 |issn = 0019-1035 |bibcode = 1987Icar...72..135B |doi = 10.1016/0019-1035(87)90125-4 |access-date= 4 January 2016}} 9. ^1 2 {{cite journal |author = Warner, B. |date = March 2000 |title = Asteroid Photometry at the Palmer Divide Observatory |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2000MPBu...27....4W |journal = The Minor Planet Bulletin |volume = 27 |pages = 4–6 |bibcode = 2000MPBu...27....4W |access-date= 4 January 2016}} 10. ^1 2 {{cite journal |display-authors = 6 |first1 = A. |last1 = Marciniak |first2 = T. |last2 = Michalowski |first3 = R. |last3 = Hirsch |first4 = R. |last4 = Behrend |first5 = L. |last5 = Bernasconi |first6 = P. |last6 = Descamps |first7 = F. |last7 = Colas |first8 = K. |last8 = Sobkowiak |first9 = K. |last9 = Kaminski |first10 = A. |last10 = Kryszczynska |first11 = T. |last11 = Kwiatkowski |first12 = M. |last12 = Polinska |first13 = R. |last13 = Rudawska |first14 = S. |last14 = Fauvaud |first15 = G. |last15 = Santacana |first16 = A. |last16 = Bruno |first17 = M. |last17 = Fauvaud |first18 = J.-P. |last18 = Teng-Chuen-Yu |first19 = A. |last19 = Peyrot |date = December 2009 |title = Photometry and models of selected main belt asteroids. VII. 350 Ornamenta, 771 Libera, and 984 Gretia |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2009A&A...508.1503M |journal = Astronomy and Astrophysics |volume = 508 |issue = 3 |pages = 1503–1507 |bibcode = 2009A&A...508.1503M |doi = 10.1051/0004-6361/200912741 |access-date= 4 January 2016}} }} External links
6 : Background asteroids|Discoveries by Joseph Rheden|Named minor planets|X-type asteroids (Tholen)|X-type asteroids (SMASS)|Astronomical objects discovered in 1913 |
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