| 词条 | (5258) 1989 AU1 |
| 释义 |
| minorplanet = yes | name = {{mp|(5258) 1989 AU|1}} | background = #C2FFFF | image = | image_size = | caption = | discovery_ref = [1] | discoverer = Y. Oshima | discovery_site = Gekko Obs. | discovered = 1 January 1989 | mpc_name = (5258) {{mp|1989 AU|1}} | alt_names = {{mp|1989 AU|1}} | pronounced = | named_after = | mp_category = Jupiter trojan [1] {{nowrap|Greek [5]{{·}}Eurybates [6]}} | orbit_ref = | epoch = 23 March 2018 (JD 2458200.5) | uncertainty = 0 | observation_arc = 29.39 yr (10,734 d) | aphelion = 5.5669 AU | perihelion = 4.7879 AU | semimajor = 5.1774 AU | eccentricity = 0.0752 | period = 11.78 yr (4,303 d) | mean_anomaly = 156.16° | mean_motion = {{Deg2DMS|0.0837|sup=ms}} / day | inclination = 5.9179° | asc_node = 248.11° | arg_peri = 230.22° | jupiter_moid = 0.0912 AU | tisserand = 2.9840 | mean_diameter = {{val|50.77|ul=km}} {{small|(calculated)}}[8] {{val|53.28|4.43|u=km}}[9] | rotation = {{val|19.85|0.05|ul=h}}[10] | albedo = {{val|0.052|0.014}}[9] {{val|0.057}} {{small|(assumed)}}[8] | spectral_type = C {{small|(assumed)}}[8] V–R {{=}} {{val|0.466|0.041}}[14] V–I {{=}} {{val|1.010|0.050}}[8] | abs_magnitude = 10.2[1][8][9] }}{{mp|(5258) 1989 AU|1}}, provisional designation {{mp|1989 AU|1}}, is a Jupiter trojan and member of the Eurybates family from the Greek camp, approximately {{convert|53|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 1 January 1989, by Japanese astronomer Yoshiaki Oshima at the Gekko Observatory, east of Shizuoka, Japan.[1] The assumed C-type asteroid belongs to the 90 largest Jupiter trojans and has a rotation period of 19.9 hours.[8] It has not yet been named since its numbering in July 1992.[22] Orbit and classification{{mp|1989 AU|1}} 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 (see Trojans in astronomy).[5][24] It orbits the Sun at a distance of 4.8–5.6 AU once every 11 years and 9 months (4,303 days; semi-major axis of 5.18 AU). Its orbit has an eccentricity of 0.08 and an inclination of 6° with respect to the ecliptic. The body's observation arc begins with its official discovery observation at Gekko Observatory in January 1989.[1]Eurybates family{{mp|1989 AU|1}} is the member of the small Eurybates family ({{small|005}}),[6] named after its parent body, 3548 Eurybates. This asteroid family comprises 218 known members of carbonaceous and/or primitive composition,[28]{{rp|23}} and is one of only a few families identified among the Jovian asteroids; with four of them in the Greek camp. This potentially collisional family was first characterized by Jakub Rozehnal and Miroslav Brož in 2011, and further described in 2014.[29][30] Other members of this family include the Jupiter trojans 8060 Anius, 9818 Eurymachos, {{mpl|(163189) 2002 EU|6}}, {{mpl|(287577) 2003 FE|42}} and 360072 Alcimedon.[28] In the HCM analysis by Milani and Knežević, however, {{mp|1989 AU|1}} belongs to the background population.[24]Physical characteristics{{mp|1989 AU|1}} is an assumed, carbonaceous C-type asteroid.[8] The overall spectral type of members of the Eurybates family is that of a C- and P-type.[28]{{rp|23}} It has a high V–I color index of 1.01.[8]Rotation periodIn April 2015, the so-far only lightcurve was obtained by Robert Stephens at the Center for Solar System Studies in Landers, California. The photometric observations gave a rotation period of {{val|19.85|0.05}} hours and a brightness variation of 0.14 magnitude ({{small|U=2+}}).[8][10]{{efn|name=lightcurve-plots-CS3}} Diameter and albedoAccording to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, {{mp|1989 AU|1}} measures 53.28 kilometers in diameter and its surface has an albedo of 0.052,[9] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 50.77 kilometers based on an absolute magnitude of 10.2.[8] {{Largest Jupiter trojans}}Numbering and namingThis minor planet was numbered by the Minor Planet Center on 14 July 1992 ({{small|M.P.C. 20492}}).[22] As of 2018, it has not been named.[1] Notes{{notelist|refs={{efn|name=lightcurve-plots-CS3|1=Lightcurve plot of (5258) 1989 AU1 from Apr 2015 by Robert Stephens at the Center for Solar System Studies {{Obscode|U81}}. Quality code is 3- (lightcurve rating at CS3). Summary figures at the LCDB and CS3.}}}} References1. ^1 2 3 4 5 6 7 {{cite web |title = 5258 (1989 AU1) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=5258 |accessdate = 20 June 2018}} [1][2][3][4][5][6][7][8][9][10][11][12]2. ^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 = 20 June 2018}} 3. ^1 2 {{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |accessdate = 20 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= 20 June 2018}} (online catalog) 5. ^1 2 {{cite web |title = Asteroid (5258) 1989 AU1 – Proper Elements |publisher = AstDyS-2, Asteroids – Dynamic Site |url = http://hamilton.dm.unipi.it/astdys/index.php?n=5258&pc=1.1.6 |access-date= 20 June 2018}} 6. ^1 2 {{cite web |title = Asteroid (5258) 1989 AU1 |work = Small Bodies Data Ferret |url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=5258 |accessdate = 20 June 2018}} 7. ^1 2 3 {{Cite journal |first1 = D. |last1 = Nesvorný |first2 = M. |last2 = Broz |first3 = V. |last3 = Carruba |date = December 2014 |title = Identification and Dynamical Properties of Asteroid Families |url = https://arxiv.org/pdf/1502.01628.pdf |journal = Asteroids IV |pages = 297–321 |bibcode = 2015aste.book..297N |doi = 10.2458/azu_uapress_9780816532131-ch016 |arxiv = 1502.01628 |access-date= 20 June 2018}} 8. ^1 {{Cite journal |first1 = M. |last1 = Broz |first2 = J. |last2 = Rozehnal |date = June 2011 |title = Eurybates – the only asteroid family among Trojans? |url = https://arxiv.org/pdf/1109.1109.pdf |journal = Monthly Notices of the Royal Astronomical Society |volume = 414 |issue = 1 |pages = 565–574 |bibcode = 2011MNRAS.414..565B |doi = 10.1111/j.1365-2966.2011.18420.x |arxiv = 1109.1109 |access-date= 20 June 2018}} 9. ^1 {{Cite journal |first1 = J. |last1 = Rozehnal |first2 = M. |last2 = Brož |date = July 2014 |title = Long-term evolution of asteroid families among Jovian Trojans |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014acm..conf..452R |journal = Asteroids |bibcode = 2014acm..conf..452R |access-date= 20 June 2018}} 10. ^1 2 3 4 5 6 7 8 9 10 {{cite web |title = LCDB Data for (5258) |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=5258%7C |accessdate = 20 June 2018}} 11. ^1 2 {{Cite journal |first1 = Robert D. |last1 = Stephens |first2 = Daniel, R. |last2 = Coley |first3 = Linda M. |last3 = French |date = January 2016 |title = Large L5 Jovian Trojan Asteroid Lightcurves from the Center for Solar System Studies |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016MPBu...43...15S |journal = The Minor Planet Bulletin |volume = 43 |issue = 1 |pages = 15–22 |issn = 1052-8091 |bibcode = 2016MPBu...43...15S |access-date= 20 June 2018}} 12. ^1 {{Cite journal |first1 = O. R. |last1 = Hainaut |first2 = H. |last2 = Boehnhardt |first3 = S. |last3 = Protopapa |date = October 2012 |title = Colours of minor bodies in the outer solar system. II. A statistical analysis revisited |url = https://arxiv.org/pdf/1209.1896.pdf |journal = Astronomy and Astrophysics |volume = 546 |page = 20 |bibcode = 2012A&A...546A.115H |doi = 10.1051/0004-6361/201219566 |arxiv = 1209.1896 |access-date= 20 June 2018}} }} External links
4 : Jupiter trojans (Greek camp)|Eurybates asteroids|Discoveries by Yoshiaki Oshima|Astronomical objects discovered in 1989 |
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