1810 Epimetheus

Stony main-belt asteroid the moon of Saturn Epimetheus (moon) October 2019 yes 1810 Epimetheus #D6D6D6 24 September 1960 C. J. van HoutenI. van Houten-G.T. Gehrels(Palomar–Leiden survey) Palomar Obs. (1810) Epimetheus 4196 P-L1942 FS1950 SC1957 WC 11962 GC1970 SS ɛ p ᵻ ˈ m iː θ iː ə s Epimetheus(Greek mythology) main-beltFlora 4 September 2017 (JD 2458000.5) 0 66.21 yr (24,182 days) 2.4284 AU 2.0198 AU 2.2241 AU 0.0919 3.32 yr (1,211 days) 338.76° 0.2972 ms / day 4.0315° 254.12° 203.70° 7.669 0.162 km8.19 km (calculated) 10.88 0.02 h28.61 0.01 hLCDB-Pravec-2007 0.24 (assumed)0.274 0.037 S 12.53 0.3312.6 1810 Epimetheus ɛ p ᵻ ˈ m iː θ iː ə s, provisional designation 4196 P-L, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered on 24 September 1960, by Dutch astronomer couple Ingrid and Cornelis van Houten, and Dutch–American astronomer Tom Gehrels during the Palomar–Leiden survey at Palomar Observatory in California, United States. It was later named after Epimetheus from Greek mythology. Classification and orbit The S-type asteroid is a member of the Flora family, one of the largest groups of stony asteroids in the main-belt. It orbits the Sun at a distance of 2.0–2.4 AU once every 3 years and 4 months (1,211 days). Its orbit has an eccentricity of 0.09 and an inclination of 4° with respect to the ecliptic. The body's observation arc begins with its official discovery observation, as the previous identifications, 1942 FS and 1950 SC, made at Johannesburg and Uccle in 1942 and 1950, respectively, remained unused. Physical characteristics Rotation period Two divergent rotational lightcurves of Epimetheus were obtained from photometric observations. They gave a rotation period of 10.9 and 28.6 hours with both having a brightness variation of 0.04 magnitude (U=2/2).LCDB-Pravec-2007 Diameter and albedo According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Epimetheus measures 7.7 kilometers in diameter and its surface has an albedo of 0.27, while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the largest member and namesake of its orbital family – and calculates a diameter of 8.2 kilometers, based on an absolute magnitude of 12.6. Survey designation The survey designation "P-L" stands for Palomar–Leiden, named after Palomar Observatory and Leiden Observatory, which collaborated on the fruitful Palomar–Leiden survey in the 1960s. Gehrels used Palomar's Samuel Oschin telescope (also known as the 48-inch Schmidt Telescope), and shipped the photographic plates to Ingrid and Cornelis van Houten at Leiden Observatory where astrometry was carried out. The trio are credited with the discovery of several thousand minor planets. Naming This minor planet is named for the Titan in Greek mythology, Epimetheus, who opened Pandora's box, which contained all the illnesses and ailments of mankind (also see 55 Pandora). Epimetheus is also a moon of Saturn, which was discovered by Voyager 1 in 1980. Epimetheus is the brother of Prometheus after whom the minor planet 1809 Prometheus was named. The official 1810 naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3935). Notes LCDB-Pravec-2007 Pravec 2007, web publication, summary figures given in the Light Curve Data Base – (1810) Epimetheus References 30em 2016-11-30 last obs. JPL Small-Body Database Browser: 1810 Epimetheus (4196 P-L) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001810 Jet Propulsion Laboratory 3 June 2017 Dictionary of Minor Planet Names – (1810) Epimetheus Schmadel Lutz D. Springer Berlin Heidelberg 145 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1811 (1810) Epimetheus 1810 Epimetheus (4196 P-L) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1810 15 December 2016 Minor Planet Discoverers Minor Planet Center https://www.minorplanetcenter.net/iau/lists/MPDiscsNum.html 24 April 2016 15 December 2016 Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008) 2009 https://archive.org/details/dictionaryminorp2008schm limited Appendix – Publication Dates of the MPCs Schmadel Lutz D. Springer Berlin Heidelberg 221 978-3-642-01964-7 10.1007/978-3-642-01965-4 1810 15 December 2016 6 Joseph R. Masiero A. K. Mainzer T. Grav J. M. Bauer R. M. Cutri C. Nugent M. S. Cabrera November 2012 Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M The Astrophysical Journal Letters 759 1 5 2012ApJ...759L...8M 10.1088/2041-8205/759/1/L8 1209.5794 15 December 2016 Brinsfield, James W. September 2008 Asteroid Lightcurve Analysis at the Via Capote Observatory: First Quarter 2008 http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2008MPBu...35..119B The Minor Planet Bulletin 35 3 119–122 1052-8091 2008MPBu...35..119B 15 December 2016 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 15 December 2016 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 1810 1809 Prometheus 1810 1811 Bruwer 001810 Category:Discoveries by Cornelis Johannes van Houten Category:Discoveries by Ingrid van Houten-Groeneveld Category:Discoveries by Tom Gehrels 4196 Category:Named minor planets 001810 19600924