1173 Anchises

Jupiter trojan asteroid March 2018 yes 1173 Anchises #C2FFFF 001173-asteroid shape model (1173) Anchises.png Shape model of Anchises from its lightcurve K. Reinmuth Heidelberg Obs. 17 October 1930 (1173) Anchises 1930 UB Anchisian æ ŋ ˈ k aɪ s iː zNoah Webster (1884) A Practical Dictionary of the English Language Anchises (Greek mythology) Jupiter trojanTrojanbackground 23 March 2018 (JD 2458200.5) 0 87.60 yr (31,997 d) 6.0232 AU 4.5678 AU 5.2955 AU 0.1374 12.19 yr (4,451 d) 184.44° 0.0809 ms / day 6.9202° 283.91° 40.496° 0.4727 AU 2.9670 170 × 121 × 121 km 99.55 0.85 km120.49 2.91 km126.27 10.7 km136 18 km 11.595 0.002 hlightcurve-plot-Stephens-A11.596 0.005 hlightcurve-plot-Stephens-B11.60 h 0.0308 0.0060.035 0.0020.050 0.009 P (Tholen)D (Barucci)U–B 0.266 080B–V 0.770 0.050V–R 0.450 0.030V–I 0.950 0.026 8.899.14 0.319.35 1173 Anchises æ ŋ ˈ k aɪ s iː z is an unusually elongated Jupiter trojan from the Trojan camp, approximately 124 km mi off us in diameter. It was discovered on 17 October 1930, by German astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany, and was the 9th such body to be discovered.2 The primitive P-type asteroid belongs to the largest Jupiter trojans, has an unusually smooth surface texture, the lowest spectral slope of all members of the Trojan camp, and a rotation period of 11.6 hours. It was named after Anchises from Greek mythology. Orbit and classification Anchises is a primitive Jovian asteroid orbiting in the trailing Trojan camp at Jupiter's Lagrangian point, 60° behind its orbit in a 1:1 resonance (see Trojans in astronomy). It is also a non-family asteroid of the Jovian background population. It orbits the Sun at a distance of 4.6–6.0 AU once every 12 years and 2 months (4,451 days; semi-major axis of 5.3 AU). Its orbit has an eccentricity of 0.14 and an inclination of 7° with respect to the ecliptic. Up to the year 2200, its closest approach to any major planet will be on 3 February 2120, when it will still be 2.669 AU km mi on on from Jupiter. The body's observation arc begins at Heidelberg with its official discovery observation in October 1930. Naming This minor planet was named after Anchises from Greek mythology. He is the father of the Trojan hero Aeneas after whom 1172 Äneas was named. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 109). Physical characteristics In the Tholen classification, Anchises is a primitive P-type asteroid, a common spectral type among the Jupiter trojans. It has the lowest spectral slope (i.e. flattest spectral response curve, thus most neutral color) among all members of the Trojan camp. In the Barucci taxonomy, it has been characterized as a carbonaceous C-type asteroid (C0). Rotation period In Summer 1986, the first photometric observations of Anchises were taken with the 0.9-meter telescope at the Cerro Tololo Observatory in Chile. Lightcurve analysis gave a well defined rotation period of 11.60 hours with a notably wide brightness variation of 0.57 magnitude (U=3). Between January 2016, and December 2017, three more rotational lightcurves were obtained by American photometrist Robert Stephens at the Center for Solar System Studies in California. They gave a concurring period of 11.595,lightcurve-plot-Stephens-A 11.596lightcurve-plot-Stephens-B and 11.599 hourslightcurve-plot-Stephens-C with an amplitude between 0.34 and 0.73 magnitude (U=3/3-/3?). A high brightness amplitude is indicative for a non-spherical, elongated shape (see below). Diameter and albedo According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, and astronomers revisiting the data from these three space-based telescopes, Anchises measures between 99.55 and 136 kilometers in diameter and its surface has an albedo between 0.0308 and 0.050. The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is an albedo of 0.0308 and a diameter of 126.27 kilometers based on an absolute magnitude of 8.89. This makes it the 7th largest Jupiter trojan only according to IRAS (126 km), and would be at least 6th should the size indeed prove to be 136 km or more, while it is much smaller and a few places further down the list according to the NEOWISE survey catalog (<100 km). One of the reasons for the large discrepancies in diameter estimates is possibly related to the results being derived from single-epoch observations of the asteroid, which is known for its large brightness variations (see above). Shape and surface In 2012, an international collaboration revisited the WISE, IRAS and Akari observational data. As already suggested by the body's high brightness amplitude, the astronomers found that Anchises is significantly elongated, with best-fit dimensions of 170 × 121 × 121 km, which corresponds to a mean diameter of 136 18 11 kilometers. Due to a small phase coefficient and a lack of any noticeable opposition effect, astronomers at Cerro Tololo concluded that this Jupiter trojan asteroid possesses an unusually smooth surface texture – far less rough than the great majority of asteroids. In case the surface of Anchises consist of bare rock, with high thermal inertia, the body's true diameter could be significantly greater than the estimated 136 kilometers, the study concludes. Notes lightcurve-plot-Stephens-A Lightcurve plot of (1173) Anchises by Robert Stephens (Feb 2016). Rotation period 11.595 0.002 hours with a brightness amplitude of 0.61 0.02 mag. Quality code of 3. Summary figures at the Center for Solar System Studies (CS3) website and at the LCDB lightcurve-plot-Stephens-B Lightcurve plot of (1173) Anchises by Robert Stephens (Dec 2016). Rotation period 11.596 0.005 hours with a brightness amplitude of 0.73 0.04 mag. Quality code of 3-. Summary figures at the Center for Solar System Studies (CS3) website and at the LCDB lightcurve-plot-Stephens-C Lightcurve plot of (1173) Anchises by Robert Stephens (2017). Rotation period 11.599 0.001 hours with a brightness amplitude of 0.34 0.02 mag. Quality code of 3. Summary figures at the Center for Solar System Studies (CS3) website and at the LCDB References 30em 2018-05-25 last obs. JPL Small-Body Database Browser: 1173 Anchises (1930 UB) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001173 Jet Propulsion Laboratory 12 June 2018 Observer Table for Asteroid 1173 Anchises (1930 UB) Horizons output http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=1173 2012-04-04 (Observer Location:@Jupiter) Schmadel Lutz D. Dictionary of Minor Planet Names Springer Berlin Heidelberg 99 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1174 (1173) Anchises 1173 Anchises (1930 UB) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1173 12 June 2018 List of Jupiter Trojans Minor Planet Center 30 May 2018 https://www.minorplanetcenter.net/iau/lists/JupiterTrojans.html 12 June 2018 T. Grav A. K. Mainzer J. M. Bauer J. R. Masiero C. R. Nugent November 2012 WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy The Astrophysical Journal 759 1 10 2012ApJ...759...49G 10.1088/0004-637X/759/1/49 1209.1549 119101711 (online catalog) Asteroid (1173) Anchises – Proper elements AstDyS-2, Asteroids – Dynamic Site https://newton.spacedys.com/astdys/index.php?n=1173&pc=1.1.6 5 June 2018 Asteroid 1173 Anchises Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1173+Anchises 12 June 2018 12 June 2018 https://web.archive.org/web/20180612233204/https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1173+Anchises dead 1173 12 June 2018 E. F. Tedesco P. V. Noah M. Noah S. D. Price October 2004 IRAS Minor Planet Survey V6.0 https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0 12 IRAS-A-FPA-3-RDR-IMPS-V6.0 2004PDSS...12.....T 15 June 2018 J. Horner T. G. Müller P. S. Lykawka July 2012 (1173) Anchises – thermophysical and dynamical studies of a dynamically unstable Jovian Trojan Monthly Notices of the Royal Astronomical Society 423 3 2587–2596 2012MNRAS.423.2587H 10.1111/j.1365-2966.2012.21067.x free 1204.1388 119307083 6 Fumihiko Usui Daisuke Kuroda Thomas G. Müller Sunao Hasegawa Masateru Ishiguro Takafumi Ootsubo Daisuke Ishihara Hirokazu Kataza Satoshi Takita Shinki Oyabu Munetaka Ueno Hideo Matsuhara Takashi Onaka October 2011 Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey Publications of the Astronomical Society of Japan 63 5 1117–1138 2011PASJ...63.1117U 10.1093/pasj/63.5.1117 (online, AcuA catalog p. 153) French, L. M. November 1987 Rotation properties of four L5 Trojan asteroids from CCD photometry http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1987Icar...72..325F Icarus 72 2 325–341.MIT–supportedresearch 0019-1035 1987Icar...72..325F 10.1016/0019-1035(87)90178-3 3 March 2018 Robert D. Stephens Daniel R. Coley Linda M. French July 2016 A Report from the L5 Trojan Camp - Lightcurves of Jovian Trojan Asteroids from the Center for Solar System Studies http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016MPBu...43..265S The Minor Planet Bulletin 43 3 265–270 1052-8091 2016MPBu...43..265S 3 March 2018 Stephens, Robert D. April 2017 Lightcurve Analysis of Trojan Asteroids at the Center for Solar System Studies 2016 October - December The Minor Planet Bulletin 44 2 123–125 32455395 7243949 1052-8091 2017MPBu...44..123S 6 Peter Veres Robert Jedicke Alan Fitzsimmons Larry Denneau Mikael Granvik Bryce Bolin Serge Chastel Richard J. Wainscoat William S. Burgett Kenneth C. Chambers Heather Flewelling Nick Kaiser Eugen A. Magnier Jeff S. Morgan Paul A. Price John L. Tonry Christopher Waters November 2015 Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results Icarus 261 34–47 2015Icar..261...34V 10.1016/j.icarus.2015.08.007 1506.00762 53493339 6 S. Fornasier E. Dotto O. Hainaut F. Marzari H. Boehnhardt F. De Luise M. A. Barucci October 2007 Visible spectroscopic and photometric survey of Jupiter Trojans: Final results on dynamical families Icarus 190 2 622–642 2007Icar..190..622F 10.1016/j.icarus.2007.03.033 0704.0350 12844258 Joseph P. Chatelain Todd J. Henry Linda M. French Jennifer G. Winters David E. Trilling June 2016 Photometric colors of the brightest members of the Jupiter L5 Trojan cloud Icarus 271 158–169 2016Icar..271..158C 10.1016/j.icarus.2016.01.026 free External links Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) Dictionary of Minor Planet Names, Google books Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 1173 1172 Äneas 1173 1174 Marmara 001173 Category:Discoveries by Karl Wilhelm Reinmuth Category:Named minor planets 001173 19301017