| 词条 | 4057 Demophon |
| 释义 |
| minorplanet = yes | name = 4057 Demophon | background = #C2FFFF | image = | image_size = | caption = | discovery_ref = [1] | discoverer = E. Bowell | discovery_site = Anderson Mesa Stn. | discovered = 15 October 1985 | mpc_name = (4057) Demophon | alt_names = 1985 TQ | pronounced = {{IPAc-en|ˈ|d|ɛ|m|ə|f|ən}} {{Respell|DEM|ə|fən}} | named_after = Demophon of Athens [1] {{small|(Greek mythology)}} | mp_category = Jupiter trojan [1] {{nowrap|Greek [5]{{·}}background [6]}} | orbit_ref = | epoch = 23 March 2018 (JD 2458200.5) | uncertainty = 0 | observation_arc = 32.65 yr (11,927 d) | aphelion = 5.8832 AU | perihelion = 4.6425 AU | semimajor = 5.2628 AU | eccentricity = 0.1179 | period = 12.07 yr (4,410 d) | mean_anomaly = 197.56° | mean_motion = {{Deg2DMS|0.0816|sup=ms}} / day | inclination = 2.8706° | asc_node = 24.383° | arg_peri = 58.875° | jupiter_moid = 0.0724 AU | tisserand = 2.9840 | mean_diameter = {{val|45.68|6.58|ul=km}}[8] {{val|53.16|u=km}} {{small|(calculated)}}[9] | rotation = {{val|29.82|0.24|u=h}}[10] | albedo = {{val|0.057}} {{small|(assumed)}}[9] {{val|0.077|0.015}}[8] | spectral_type = C {{small|(assumed)}}[9] V–I {{=}} {{val|1.060|0.037}}[9] | abs_magnitude = 10.1[1][1][8][9] }}4057 Demophon, provisional designation {{mp|1985 TQ}}, is a larger Jupiter trojan from the Greek camp, approximately {{convert|46|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 15 October 1985 by American astronomer Edward Bowell at the Anderson Mesa Station of the Lowell Observatory near Flagstaff, Arizona.[1] The dark Jovian asteroid has a longer-than-average rotation period of 29.8 hours.[9] It was named after the Athen prince Demophon who fought in the Trojan War.[1] Orbit and classificationDemophon is a dark Jovian asteroid in a 1:1 orbital resonance with Jupiter. It is located in the leading Greek camp at the Gas Giant's {{L4}} Lagrangian point, 60° ahead on its orbit {{cross reference|(see Trojans in astronomy)}}. It is also a non-family asteroid of the Jovian background population.[6]It orbits the Sun at a distance of 4.6–5.9 AU once every 12 years and 1 month (4,410 days; semi-major axis of 5.26 AU). Its orbit has an eccentricity of 0.12 and an inclination of 3° with respect to the ecliptic. The body's observation arc begins with a precovery taken at Crimea–Nauchnij in September 1985, just three weeks prior to its official discovery observation at Anderson Mesa.[1] Physical characteristicsDemophon is an assumed, carbonaceous C-type asteroid. It has a high V–I color index of 1.06.[9] Most larger Jupiter trojans are D-type asteroids. Rotation periodIn June 1994, a first rotational lightcurve of Demophon was obtained from photometric observations by Stefano Mottola and Anders Erikson using the Dutch 0.9-metre Telescope at ESO's La Silla Observatory in Chile. Lightcurve analysis gave a rotation period of 29.31 hours with a brightness variation of 0.23 magnitude ({{small|U=2}}).[27] In August 2015, photometric observations by the Kepler space telescope rendered another two lightcurves ({{small|U=3-/2+}}).[9][10][30] The best-rated one showed a period of {{val|29.82|0.24}} hours and a brightness variation of 0.21 magnitude.[10] Most asteroids have a shorter rotation period between 2 and 20 hours (also see List of slow rotators). Diameter and albedoAccording to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Demophon measures 45.68 kilometers in diameter and its surface has an albedo of 0.077,[8] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 53.16 kilometers based on an absolute magnitude of 10.1.[9] {{Largest Jupiter trojans}}NamingThis minor planet was named from Greek mythology after the Athen prince Demophon, son of King Theseus and Phaedra. After participation in the Trojan War, Demophon married Phyllis, who committed suicide after he had abandoned her.[1] The official naming citation was published by the Minor Planet Center on 22 April 1997 ({{small|M.P.C. 29669}}).[35] References1. ^1 2 3 4 5 6 7 8 9 {{cite web |title = 4057 Demophon (1985 TQ) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=4057 |accessdate = 21 June 2018}} [1][2][3][4][5][6][7][8][9]2. ^1 {{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 = 21 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 = 21 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 = 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= 21 June 2018}} (online catalog) 5. ^1 2 {{cite web |title = Asteroid (4057) Demophon – Proper Elements |publisher = AstDyS-2, Asteroids – Dynamic Site |url = http://hamilton.dm.unipi.it/astdys/index.php?n=4057&pc=1.1.6 |access-date= 21 June 2018}} 6. ^1 2 3 4 5 6 7 8 9 {{cite web |title = LCDB Data for (4057) Demophon |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=4057%7CDemophon |accessdate = 21 June 2018}} 7. ^1 {{cite journal |display-authors = 6 |first1 = Stefano |last1 = Mottola |first2 = Mario |last2 = Di Martino |first3 = Anders |last3 = Erikson |first4 = Maria |last4 = Gonano-Beurer |first5 = Albino |last5 = Carbognani |first6 = Uri |last6 = Carsenty |first7 = Gerhard |last7 = Hahn |first8 = Hans-Josef |last8 = Schober |first9 = Felix |last9 = Lahulla |first10 = Marco |last10 = Delbò |first11 = Claes-Ingvar |last11 = Lagerkvist |date = May 2011 |title = Rotational Properties of Jupiter Trojans. I. Light Curves of 80 Objects |url = http://iopscience.iop.org/article/10.1088/0004-6256/141/5/170/pdf |journal = The Astronomical Journal |volume = 141 |issue = 5 |page = 32 |bibcode = 2011AJ....141..170M |doi = 10.1088/0004-6256/141/5/170 |access-date= 21 June 2018}} 8. ^1 {{Cite journal |display-authors = 6 |first1 = Gy. M. |last1 = Szabó |first2 = A. |last2 = Pál |first3 = Cs. |last3 = Kiss |first4 = L. L. |last4 = Kiss |first5 = L. |last5 = Molnár |first6 = O. |last6 = Hanyecz |first7 = E. |last7 = Plachy |first8 = K. |last8 = Sárneczky |first9 = R. |last9 = Szabó |date = March 2017 |title = The heart of the swarm: K2 photometry and rotational characteristics of 56 Jovian Trojan asteroids |url = https://arxiv.org/pdf/1609.02760.pdf |journal = Astronomy and Astrophysics |volume = 599 |page = 13 |bibcode = 2017A&A...599A..44S |doi = 10.1051/0004-6361/201629401 |arxiv = 1609.02760 |access-date= 21 June 2018}} 9. ^1 2 3 {{Cite journal |first1 = Erin Lee |last1 = Ryan |first2 = Benjamin N. L. |last2 = Sharkey |first3 = Charles E. |last3 = Woodward |date = March 2017 |title = Trojan Asteroids in the Kepler Campaign 6 Field |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2017AJ....153..116R |journal = The Astronomical Journal |volume = 153 |issue = 3 |page = 12 |bibcode = 2017AJ....153..116R |doi = 10.3847/1538-3881/153/3/116 |access-date= 21 June 2018}} }} External links
5 : Jupiter trojans (Greek camp)|Discoveries by Edward L. G. Bowell|Minor planets named from Greek mythology|Named minor planets|Astronomical objects discovered in 1985 |
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