1345 Potomac

Hildian asteroid October 2019 yes 1345 Potomac #D6D6D6 J. H. Metcalf Taunton Obs. 4 February 1908 (1345) Potomac 1908 CG1932 CF1932 EA1932 FB1971 DE 2 Potomac River(U.S. Mid-Atlantic river) main-belt(outer)Hildabackground 27 April 2019 (JD 2458600.5) 0 111.20 yr (40,617 d) 4.7100 AU 3.2611 AU 3.9856 AU 0.1818 7.96 yr (2,906 d) 31.380° 0.1239 ms / day 11.402° 137.43° 333.12° 0.4592 AU 2.9930 71.82 3.0 km72.975 0.463 km76.72 2.34 km 11.41 0.01 h 0.039 0.0030.043 0.0080.0439 0.004 Tholen XCB–V 0.719U–B 0.286 9.739.9 1345 Potomac (En-us-Potomac.ogg p ə ˈ t oʊ m ə k), provisional designation 1908 CG, is a dark Hildian asteroid from the outermost regions of the asteroid belt, approximately 73 km mi 2 us in diameter. It was discovered on 4 February 1908, by American astronomer Joel Metcalf at the Taunton Observatory 803 in Massachusetts, United States. The X-type asteroid has a rotation period of 11.4 hours. It was named for the Potomac River on which Washington, D.C. is located. Orbit and classification Potomac is member of the dynamical Hilda group, which stays in 3:2 orbital resonance with Jupiter. It is, however, not a member of the Hilda family but a non-family asteroid of the main belt's background population when applying the Hierarchical Clustering Method to its proper orbital elements. It orbits the Sun in the outermost asteroid belt at a distance of 3.3–4.7 AU once every 7 years and 12 months (2,910 days; semi-major axis of 3.99 AU). Its orbit has an eccentricity of 0.18 and an inclination of 11° with respect to the ecliptic. The body's observation arc begins at the United States Naval Observatory, three weeks after its official discovery observation at Taunton. Naming This minor planet was named after the U.S. Potomac River in the Mid-Atlantic region of the United States, on which Washington, D.C. is located. The river flows from West Virginia into the Chesapeake Bay and forms the southern boundary of Maryland. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 122). Physical characteristics In the Tholen classification, Potomac is an X-type asteroid. It has also been characterized as a carbonaceous C-type asteroid by Pan-STARRS photometric survey. Rotation period Two rotational lightcurves of Potomac was obtained from photometric observations. Lightcurve analysis gave a rotation period of 11.40 and 11.41 hours with a brightness amplitude of 0.22 and 0.24 magnitude, respectively (U=2/3). Diameter and albedo According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Potomac measures between 71.82 and 76.72 kilometers in diameter and its surface has an albedo between 0.039 and 0.0439. The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0439 and a diameter of 71.82 kilometers based on an absolute magnitude of 9.73. References 30em 2019-05-10 last obs. JPL Small-Body Database Browser: 1345 Potomac (A908 CE) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001345 https://web.archive.org/web/20200820002945/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001345 dead 20 August 2020 Jet Propulsion Laboratory 29 October 2019 Schmadel Lutz D. Dictionary of Minor Planet Names Springer Berlin Heidelberg 109 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1346 (1345) Potomac 1345 Potomac (A908 CE) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1345 29 October 2019 6 T. Grav A. K. Mainzer J. Bauer J. Masiero T. Spahr R. S. McMillan R. Walker R. Cutri E. Wright P. R. Eisenhardt E. Blauvelt E. DeBaun D. Elsbury T. Gautier S. Gomillion E. Hand A. Wilkins January 2012 WISE/NEOWISE Observations of the Hilda Population: Preliminary Results http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...744..197G The Astrophysical Journal 744 2 15 2012ApJ...744..197G 10.1088/0004-637X/744/2/197 1110.0283 44000310 17 November 2017 Asteroid 1345 Potomac – Proper Elements AstDyS-2, Asteroids – Dynamic Site https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=1345 29 October 2019 1345 17 November 2017 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 free (online, AcuA catalog p. 153) 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 12 IRAS-A-FPA-3-RDR-IMPS-V6.0 2004PDSS...12.....T 22 October 2019 6 M. Dahlgren J. F. Lahulla C.-I. Lagerkvist J. Lagerros S. Mottola A. Erikson M. Gonano-Beurer M. Di Martino June 1998 A Study of Hilda Asteroids. V. Lightcurves of 47 Hilda Asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1998Icar..133..247D Icarus 133 2 247–285 1998Icar..133..247D 10.1006/icar.1998.5919 17 November 2017 Brinsfield, James W. April 2010 Asteroid Lightcurve Analysis at Via Capote Observatory: 4th Quarter 2009 http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2010MPBu...37...50B The Minor Planet Bulletin 37 2 50–53 1052-8091 2010MPBu...37...50B 17 November 2017 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 http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V Icarus 261 34–47 2015Icar..261...34V 10.1016/j.icarus.2015.08.007 1506.00762 53493339 17 November 2017 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 Asteroids and comets rotation curves, CdR https://web.archive.org/web/20160729213840/http://obswww.unige.ch/~behrend/page_cou.html 29 July 2016 – Observatoire de Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 1345 1344 Caubeta 1345 1346 Gotha 001345 Category:Discoveries by Joel Hastings Metcalf Category:Named minor planets 001345 19080204