| 词条 | 12444 Prothoon |
| 释义 |
| minorplanet = yes | name = 12444 Prothoon | background = #C2FFFF | image = | image_size = | caption = | discovery_ref = [1] | discoverer = E. W. Elst | discovery_site = La Silla Obs. | discovered = 15 April 1996 | mpc_name = (12444) Prothoon | alt_names = {{mp|1996 GE|19}} | pronounced = {{IPAc-en|p|r|ə|ˈ|θ|oʊ|ɒ|n}} {{Respell|prə|THOH|on}} | named_after = Prothoon [1] {{small|(Greek mythology)}} | mp_category = Jupiter trojan [1][5] {{nowrap|Trojan [6][7]{{·}}background [7]}} | orbit_ref = | epoch = 23 March 2018 (JD 2458200.5) | uncertainty = 0 | observation_arc = 22.17 yr (8,096 d) | aphelion = 5.6206 AU | perihelion = 4.8680 AU | semimajor = 5.2443 AU | eccentricity = 0.0718 | period = 12.01 yr (4,387 d) | mean_anomaly = 240.44° | mean_motion = {{Deg2DMS|0.0821|sup=ms}} / day | inclination = 30.827° | asc_node = 213.23° | arg_peri = 64.656° | jupiter_moid = 0.3876 AU | tisserand = 2.7120 | mean_diameter = {{val|62.41|2.92|ul=km}}[10] {{val|63.84|0.84|u=km}}[11] {{val|64.31|15.8|u=km}}[12] {{val|64.41|u=km}} {{small|(derived)}}[5] | rotation = {{val|15.82|0.01|ul=h}}[14] | albedo = {{val|0.039|0.030}}[12] {{val|0.043|0.004}}[10] {{val|0.0467}} {{small|(derived)}}[5] {{val|0.052|0.008}}[11] | spectral_type = C {{small|(assumed)}}[5] | abs_magnitude = 9.8[1][11] 9.9[5] {{val|9.95|0.31}}[24] 10.10[10][12] }}12444 Prothoon, provisional designation {{mp|1996 GE|19}}, is a large Jupiter trojan from the Trojan camp, approximately {{convert|64|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 15 April 1996, by Belgian astronomer Eric Elst at the La Silla Observatory in northern Chile.[1] The assumed C-type asteroid is one of the 60 largest Jupiter trojans and has a rotation period of 15.82 hours.[5] It was named after Prothoon from Greek mythology.[1] Orbit and classificationProthoon is a dark Jovian asteroid orbiting in the trailering Trojan camp at Jupiter's {{L5}} Lagrangian point, 60° behind on the Gas Giant's orbit in a 1:1 resonance (see Trojans in astronomy). This asteroid is not a member of any asteroid family but belongs to the Jovian background population.[7][31] It orbits the Sun at a distance of 4.9–5.6 AU once every 12.01 years (4,387 days; semi-major axis of 5.24 AU). Its orbit has an eccentricity of 0.07 and an inclination of 31° with respect to the ecliptic. The body's observation arc begins with a precovery taken at La Silla in March 1996, one month prior to its official discovery observation.[1]Physical characteristicsProthoon is an assumed C-type asteroid.[5]Rotation periodIn August 2011, a rotational lightcurve of Prothoon was obtained from photometric observations by Robert Stephens at the Goat Mountain Astronomical Research Station {{Obscode|G79}} in California. Lightcurve analysis gave a rotation period of 15.82 hours with a brightness amplitude of 0.20 magnitude ({{small|U=3-}}).[5][14] Diameter and albedoAccording to the surveys carried out by the Japanese Akari satellite, the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, and the Infrared Astronomical Satellite IRAS, Prothoon measures between 62.41 and 64.31 kilometers in diameter and its surface has an albedo between 0.039 and 0.052.[10][11][12] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0467 and a diameter of 64.41 kilometers based on an absolute magnitude of 9.9.[5] {{Largest Jupiter trojans}}NamingThis minor planet was named from Greek mythology after the Trojan warrior Prothoon, who was killed by Teucer during the Trojan War.[1] The official naming citation was published by the Minor Planet Center on 6 January 2003 ({{small|M.P.C. 47300}}).[42] References1. ^1 2 3 4 5 6 7 8 {{cite web |title = 12444 Prothoon (1996 GE19) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=12444 |accessdate = 8 June 2018}} [1][2][3][4][5][6][7][8][9][10][11]2. ^1 {{cite web |title = List of Jupiter Trojans |work = Minor Planet Center |date = 30 May 2018 |url = https://www.minorplanetcenter.net/iau/lists/JupiterTrojans.html |accessdate = 6 June 2018}} 3. ^1 {{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |accessdate = 8 June 2018}} 4. ^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 = https://arxiv.org/pdf/1209.1549.pdf |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= 9 June 2018}} (online catalog) 5. ^1 2 3 {{cite web |title = Asteroid (12444) Prothoon – Proper elements |publisher = AstDyS-2, Asteroids – Dynamic Site |url = http://hamilton.dm.unipi.it/astdys/index.php?n=12444&pc=1.1.6 |accessdate = 8 June 2018}} 6. ^1 {{cite web |title = Asteroid 12444 Prothoon |work = Small Bodies Data Ferret |url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=12444+Prothoon |accessdate = 8 June 2018}} 7. ^1 2 3 4 {{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 = https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab |journal = NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0 |bibcode = 2004PDSS...12.....T |accessdate = 15 June 2018}} 8. ^1 2 3 4 5 6 7 8 9 {{cite web |title = LCDB Data for (12444) Prothoon |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=12444%7CProthoon |accessdate = 8 June 2018}} 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= 15 June 2018}} (online, [https://core.ac.uk/download/pdf/43545172.pdf AcuA catalog p. 153]) 10. ^1 2 {{Cite journal |first1 = Linda M. |last1 = French |first2 = Robert D. |last2 = Stephens |first3 = Daniel R. |last3 = Coley |first4 = Ralph |last4 = Megna |first5 = Lawrence H. |last5 = Wasserman |date = July 2012 |title = Photometry of 17 Jovian Trojan Asteroids |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012MPBu...39..183F |journal = The Minor Planet Bulletin |volume = 39 |issue = 3 |pages = 183–187 |issn = 1052-8091 |bibcode = 2012MPBu...39..183F |access-date= 8 June 2018}} 11. ^1 {{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 |url = https://arxiv.org/pdf/1506.00762.pdf |journal = Icarus |volume = 261 |pages = 34–47 |bibcode = 2015Icar..261...34V |doi = 10.1016/j.icarus.2015.08.007 |arxiv = 1506.00762 |access-date= 8 June 2018}} }} External links
5 : Jupiter trojans (Trojan camp)|Discoveries by Eric Walter Elst|Minor planets named from Greek mythology|Named minor planets|Astronomical objects discovered in 1996 |
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