| 词条 | 4902 Thessandrus |
| 释义 |
| minorplanet = yes | name = 4902 Thessandrus | background = #C2FFFF | image = | image_size = | caption = | discovery_ref = [1] | discoverer = C. Shoemaker | discovery_site = Palomar Obs. | discovered = 9 January 1989 | mpc_name = (4902) Thessandrus | alt_names = {{mp|1989 AN|2}}{{·}}{{mp|1985 TK|3}} | pronounced = {{IPAc-en|θ|ᵻ|ˈ|s|æ|n|d|r|ə|s}} {{Respell|the|SAN|drəs}} | named_after = Thessander {{small|(Greek mythology)}}[2] | mp_category = Jupiter trojan [1] {{nowrap|Greek [5]{{·}}background [6]}} | orbit_ref = | epoch = 23 March 2018 (JD 2458200.5) | uncertainty = 0 | observation_arc = 64.23 yr (23,459 d) | aphelion = 5.4234 AU | perihelion = 4.9858 AU | semimajor = 5.2046 AU | eccentricity = 0.0420 | period = 11.87 yr (4,337 d) | mean_anomaly = 204.25° | mean_motion = {{Deg2DMS|0.0830|sup=ms}} / day | inclination = 9.0728° | asc_node = 170.29° | arg_peri = 270.62° | jupiter_moid = 0.1982 AU | tisserand = 2.9730 | mean_diameter = {{val|51.26|0.66|ul=km}}[8] 61.04 km {{small|(calculated)}}[9] {{val|71.79|2.84|u=km}}[10] | rotation = {{val|738|20|ul=h}}[11] | albedo = {{val|0.057}} {{small|(assumed)}}[9] {{val|0.060|0.006}}[10] {{val|0.081|0.012}}[8] | spectral_type = D {{small|(Pan-STARRS)}}[9][16] D {{small|(SDSS-MOC)}}[17] V–I {{=}} {{val|0.960|0.044}}[9] | abs_magnitude = 9.60[10] 9.8[1][9][8] }} 4902 Thessandrus ({{IPAc-en|θ|ᵻ|ˈ|s|æ|n|d|r|ə|s}} {{Respell|the|SAN|drəs}}), provisionally designated {{mp|1989 AN|2}}, is a Jupiter trojan from the Greek camp, approximately {{convert|60|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 9 January 1989, by American astronomer Carolyn Shoemaker at the Palomar Observatory in California, and later named after Thessander (Thessandrus) from Greek mythology.[2] The dark D-type asteroid is an exceptionally slow rotator and tumbler. It belongs to the 70 largest Jupiter trojans. Orbit and classificationThessandrus is a dark Jovian asteroid orbiting in the leading Greek camp at Jupiter's {{L4}} Lagrangian point, 60° ahead of the Gas Giant's orbit in a 1:1 resonance {{cross reference|(see Trojans in astronomy)}}.[5] It is also a non-family asteroid in the Jovian background population.[6]It orbits the Sun at a distance of 5.0–5.4 AU once every 11 years and 10 months (4,337 days; semi-major axis of 5.2 AU). Its orbit has an eccentricity of 0.04 and an inclination of 9° with respect to the ecliptic. A first precovery was taken at the discovering observatory in 1954, extending the body's observation arc by 35 years prior to its official discovery observation.[1] Physical characteristicsThessandrus has been characterized as a D-type asteroid by Pan-STARRS' survey.[9][16] It is also a D-type in the SDSS-based taxonomy.[17]Slow rotatorIn February 2013, a rotational lightcurve of Thessandrus was obtained from photometric observations by American astronomer Robert Stephens at the Center for Solar System Studies {{Obscode|U81}} in California. It gave an exceptionally long rotation period of {{val|738|20}} hours with a brightness variation of 0.60 in magnitude ({{small|U=2}}).[11] It belongs to the slowest rotators known to exist. TumblerThe astronomers also detected a non-principal axis rotation seen in distinct rotational cycles in successive order. This is commonly known as tumbling.[11] Thessandrus is the fourth-largest asteroid and largest Jupiter trojan known to be is such a state (also see List of tumblers). Diameter and albedoAccording to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Thessandrus measures between 51.26 and 71.79 kilometers in diameter and its surface has an albedo between 0.060 and 0.081.[8][10] The Collaborative Asteroid Lightcurve Link assumes a standard albedo of a carbonaceous asteroid of 0.057 and calculates a diameter of 61.04 kilometers based on an absolute magnitude of 9.8.[9] {{Largest Jupiter trojans}}NamingThis minor planet is named after Thessander (Thessandrus) from Greek mythology and Homer's Iliad. Together with 30 other Greek soldiers he hid in the Trojan horse's belly.[2] The official naming citation was published by the Minor Planet Center on 4 June 1993 ({{small|M.P.C. 22248}}).[38] References1. ^1 2 3 {{cite book |title = Dictionary of Minor Planet Names – (4902) Thessandrus |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 423 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_4792 |chapter = (4902) Thessandrus }} [1][2][3][4][5][6][7][8][9][10][11]2. ^1 2 3 4 {{cite web |title = 4902 Thessandrus (1989 AN2) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=4902 |accessdate = 17 June 2018}} 3. ^1 2 {{cite web |title = List of Jupiter Trojans |work = Minor Planet Center |first3 = V. |last3 = Carruba |date = 1 June 2018 |url = https://www.minorplanetcenter.net/iau/lists/JupiterTrojans.html |accessdate = 17 June 2018}} 4. ^1 {{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |accessdate = 17 June 2018}} 5. ^1 2 3 4 {{cite journal |first1 = T. |last1 = Grav |first2 = A. K. |last2 = Mainzer |first3 = J. M. |last3 = Bauer |first4 = J. R. |last4 = Masiero |first5 = C. R. |last5 = Nugent |date = November 2012 |title = WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759...49G |journal = The Astrophysical Journal |volume = 759 |issue = 1 |page = 10 |bibcode = 2012ApJ...759...49G |doi = 10.1088/0004-637X/759/1/49 |arxiv = 1209.1549 |access-date= 17 June 2018}} (online catalog) 6. ^1 2 {{cite web |title = Asteroid (4902) Thessandrus – Proper Elements |publisher = AstDyS-2, Asteroids – Dynamic Site |url = http://hamilton.dm.unipi.it/astdys/index.php?n=4902&pc=1.1.6 |access-date= 17 June 2018}} 7. ^1 2 {{Cite journal |first1 = J. M. |last1 = Carvano |first2 = P. H. |last2 = Hasselmann |first3 = D. |last3 = Lazzaro |first4 = T. |last4 = Mothé-Diniz |date = February 2010 |title = SDSS-based taxonomic classification and orbital distribution of main belt asteroids |url = https://sbnarchive.psi.edu/pds3/non_mission/EAR_A_I0035_5_SDSSTAX_V1_1/data/sdsstax_ast_table.tab |journal = Astronomy and Astrophysics |volume = 510 |page = 12 |bibcode = 2010A&A...510A..43C |doi = 10.1051/0004-6361/200913322 |access-date= 12 June 2018}} 8. ^1 2 3 4 5 6 7 {{cite web |title = LCDB Data for (4902) Thessandrus |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=4902%7CThessandrus |accessdate = 30 June 2016}} 9. ^1 2 3 4 {{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://pasj.oxfordjournals.org/content/63/5/1117.full.pdf+html |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= 17 June 2018}} (online, [https://core.ac.uk/download/pdf/43545172.pdf AcuA catalog p. 153]) 10. ^1 2 3 {{Cite journal |first1 = Linda M. |last1 = French |first2 = Robert, D. |last2 = Stephens |first3 = Daniel R. |last3 = Coley |first4 = Lawrence H. |last4 = Wasserman |first5 = Faith |last5 = Vilas |first6 = Daniel |last6 = La Rocca |date = October 2013 |title = A Troop of Trojans: Photometry of 24 Jovian Trojan Asteroids |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013MPBu...40..198F |journal = The Minor Planet Bulletin |volume = 40 |issue = 4 |pages = 198–203 |issn = 1052-8091 |bibcode = 2013MPBu...40..198F |access-date= 30 June 2016}} 11. ^1 2 {{cite journal |display-authors = 6 |first1 = Peter |last1 = Veres |first2 = Robert |last2 = Jedicke |first3 = Alan |last3 = Fitzsimmons |first4 = Larry |last4 = Denneau |first5 = Mikael |last5 = Granvik |first6 = Bryce |last6 = Bolin |first7 = Serge |last7 = Chastel |first8 = Richard J. |last8 = Wainscoat |first9 = William S. |last9 = Burgett |first10 = Kenneth C. |last10 = Chambers |first11 = Heather |last11 = Flewelling |first12 = Nick |last12 = Kaiser |first13 = Eugen A. |last13 = Magnier |first14 = Jeff S. |last14 = Morgan |first15 = Paul A. |last15 = Price |first16 = John L. |last16 = Tonry |first17 = Christopher |last17 = Waters |date = November 2015 |title = Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results |journal = Icarus |volume = 261 |pages = 34–47 |bibcode = 2015Icar..261...34V |doi = 10.1016/j.icarus.2015.08.007 |arxiv = 1506.00762 }} }} External links
6 : Jupiter trojans (Greek camp)|Discoveries by Carolyn S. Shoemaker|Minor planets named from Greek mythology|Named minor planets|Slow rotating minor planets|Astronomical objects discovered in 1989 |
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