11395 Iphinous
{{Short description|Jupiter trojan from the Greek camp}}
{{Use dmy dates|date=April 2020}}
{{Infobox planet
| minorplanet = yes
| name = 11395 Iphinous
| background = #C2FFFF
| image =
| image_size =
| caption =
| discoverer = LINEAR
| discovery_site = Lincoln Lab's ETS
| discovered = 15 December 1998
| mpc_name = (11395) Iphinous
| alt_names = {{mp|1998 XN|77}}{{·}}{{mp|1992 GF|3}}
| adjective = Iphinoian
| pronounced =
| named_after = Iphinous
{{small|(Greek mythology)}}
| mp_category = Jupiter trojan
{{nowrap|Greek{{·}}background}}
| epoch = 23 March 2018 (JD 2458200.5)
| uncertainty = 0
| observation_arc = 26.63 yr (9,727 d)
| aphelion = 5.5632 AU
| perihelion = 4.8590 AU
| semimajor = 5.2111 AU
| eccentricity = 0.0676
| period = 11.90 yr (4,345 d)
| mean_anomaly = 316.51°
| mean_motion = {{Deg2DMS|0.0829|sup=ms}} / day
| inclination = 24.141°
| asc_node = 213.24°
| arg_peri = 118.07°
| jupiter_moid = 0.0684 AU
| tisserand = 2.8210
| mean_diameter = {{val|64.51|ul=km}} {{small|(derived)}}
{{val|64.71|3.1|u=km}}
{{val|67.78|1.84|u=km}}
{{val|68.98|1.12|u=km}}
| rotation = {{val|13.696|0.06|ul=h}}
{{val|13.70|0.06|u=h}} {{small|(poor)}}
{{val|17.383|0.005|u=h}}{{efn|name=lightcurve-plots-Stephens}}
{{val|17.44|0.01|u=h}}{{efn|name=lightcurve-plots-Stephens}}
{{val|17.89|0.005|u=h}} {{small|(poor)}}{{efn|name=lightcurve-plots-Stephens}}
| albedo = {{val|0.045|0.007}}
{{val|0.0510}} {{small|(derived)}}
{{val|0.061|0.004}}
{{val|0669|0.007}}
| spectral_type = C {{small|(assumed)}}
}}
11395 Iphinous (provisional designation {{mp|1998 XN|77}}) is a large Jupiter trojan from the Greek camp approximately {{convert|66|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 15 December 1998, by astronomers with the Lincoln Near-Earth Asteroid Research at the Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico, in the United States. The dark asteroid has a rotation period of 17.4 hours and possibly a spherical shape. The body is one of the 50 largest Jupiter trojans. It was named from Greek mythology after the Achaean soldier Iphinous who was killed by Glaucus in the Trojan War.
Orbit and classification
Iphinous is a 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). It is also a non-family asteroid in the Jovian background population. The asteroid orbits the Sun at a distance of 4.9–5.6 AU once every 11 years and 11 months (4,345 days; semi-major axis of 5.21 AU). Its orbit has an eccentricity of 0.07 and an inclination of 24° with respect to the ecliptic.
The body's observation arc begins with a precovery taken at the Siding Spring Observatory in February 1991, nearly 8 years prior to its official discovery observation at Socorro.
Naming
This minor planet was numbered on 31 August 1999 ({{small|M.P.C. 35589}}). On 14 May 2021, the object was named by the Working Group for Small Bodies Nomenclature (WGSBN) after Iphinous from Greek mythology. An Achaean soldier who participated in the Trojan War, Iphinous was killed by Glaucus in hand-to-hand combat during the siege of Troy.
Physical characteristics
Iphinous is a generically assumed C-type asteroid. Many if not most Jupiter trojans show an even darker D or P-type spectrum.
= Rotation period =
In 2009 and 2010, two fragmentary lightcurves of Iphinous were obtained from photometric observations by Stefano Mottola at the Calar Alto Observatory in Spain. Lightcurve analysis gave a tentative rotation period of 13.696 and 13.70 hours with a brightness variation of 0.14 and 0.06 magnitude, respectively ({{small|U=2-/1+}}).
During 2015–2017, three additional photometric observation were made at the Californian Center for Solar System Studies by Robert Stephens, Daniel Coley and Brian Warner in collaboration with Linda French from Illinois Wesleyan University. The two best-rated lightcurves gave a period of 17.383 and 17.44 with an amplitude of 0.08 and 0.11 magnitude, respectively, indicating that the body has a nearly spherical shape ({{small|U=3-/3-}}).{{efn|name=lightcurve-plots-Stephens}}
= Diameter and albedo =
According to the surveys carried out by the Japanese Akari satellite, the Infrared Astronomical Satellite IRAS, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Iphinous measures between 64.71 and 68.98 kilometers in diameter and its surface has an albedo between 0.045 and 0.067.
The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0510 and a diameter of 64.51 kilometers based on an absolute magnitude of 9.8.
{{Largest Jupiter trojans}}
Notes
{{notelist|refs=
{{efn|name=lightcurve-plots-Stephens|1=Three lightcurve plots of (11395) Iphinous by Robert Stephens and collaborators at the Center for Solar System Studies {{Obscode|U81}} in Landers, California. Plots from [http://www.planetarysciences.org/plots/RDS/11395_1998XN77_2015-05-31_2.PNG 2015] (poor), [http://www.planetarysciences.org/plots/RDS/11395_1998XN77_20160607.PNG 2016] and [http://www.planetarysciences.org/plots/RDS/11395_1998XN77_20170520.PNG 2017]. Summary figures at the [http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=11395%7C1998+XN77 LCDB].}}
}}
References
{{reflist|30em|refs=
|type = 2017-09-28 last obs.
|title = JPL Small-Body Database Browser: 11395 (1998 XN77)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2011395
|publisher = Jet Propulsion Laboratory
|accessdate = 31 May 2018}}
|title = 11395 (1998 XN77)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=11395
|accessdate = 31 May 2018}}
|title = List of Jupiter Trojans
|work = Minor Planet Center
|date = 2 February 2018
|url = https://www.minorplanetcenter.net/iau/lists/JupiterTrojans.html
|accessdate = 31 May 2018}}
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|accessdate = 31 May 2018}}
|title = WGSBN Bulletin Archive
|work = Working Group for Small Bodies Nomenclature
|date = 14 May 2021
|url = https://www.wgsbn-iau.org/files/Bulletins/index.html
|accessdate = 16 May 2021}} ([https://www.wgsbn-iau.org/files/Bulletins/V001/WGSBNBull_V001_001.pdf Bulletin #1])
|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
|volume = 12
|pages = IRAS-A-FPA-3-RDR-IMPS-V6.0
|bibcode = 2004PDSS...12.....T
|accessdate = 15 June 2018}}
|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
|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
|s2cid = 119101711
}} ([http://vizier.cfa.harvard.edu/viz-bin/VizieR-6?-source=J/ApJ/759/49/table1&MPC=11395 online catalog])
|title = Asteroid (11395) 1998 XN77 – Proper Elements
|publisher = AstDyS-2, Asteroids – Dynamic Site
|url = https://newton.spacedys.com/astdys/index.php?n=11395&pc=1.1.6
|accessdate = 31 May 2018}}
|title = Asteroid (11395) 1998 XN77
|work = Small Bodies Data Ferret
|url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=11395
|accessdate = 31 May 2018
|archive-date = 3 October 2020
|archive-url = https://web.archive.org/web/20201003110019/https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=11395
|url-status = dead
}}
|title = LCDB Data for (11395)
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=11395%7C
|accessdate = 31 May 2018}}
|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
|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
|doi-access=
}} ([http://vizier.cfa.harvard.edu/viz-bin/VizieR-5?-source=J/PASJ/63/1117/acua_v1&Num=11395 online], [https://core.ac.uk/download/pdf/43545172.pdf AcuA catalog p. 153])
|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
|journal = The Astronomical Journal
|volume = 141
|issue = 5
|page = 32
|bibcode = 2011AJ....141..170M
|doi = 10.1088/0004-6256/141/5/170|doi-access= free
}}
|first1 = Robert D. |last1 = Stephens
|first2 = Daniel R. |last2 = Coley
|first3 = Brian D. |last3 = Warner
|first4 = Linda, M. |last4 = French
|date = October 2016
|title = Lightcurves of Jovian Trojan Asteroids from the Center for Solar System Studies: L4 Greek Camp and Spies
|journal = The Minor Planet Bulletin
|volume = 43
|issue = 4
|pages = 323–331
|issn = 1052-8091
|bibcode = 2016MPBu...43..323S}}
|first1 = Robert D. |last1 = Stephens
|first2 = Brian D. |last2 = Warner
|date = October 2017
|title = Lightcurve Analysis of L4 Trojan Asteroids at the Center for Solar System Studies 2017 April–June
|journal = The Minor Planet Bulletin
|volume = 44
|issue = 4
|pages = 312–316
|issn = 1052-8091
|bibcode = 2017MPBu...44..312S}}
}}
External links
- [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }})
- [https://www.minorplanetcenter.net/iau/lists/NumberedMPs010001.html Discovery Circumstances: Numbered Minor Planets (10001)-(15000)] – Minor Planet Center
- {{AstDys|11395}}
- {{JPL small body|id=2011395}}
{{Minor planets navigator | |number=11395 |}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Iphinous}}