1919 Clemence

Hungaria asteroid and suspected tumbler October 2019 yes 1919 Clemence #D6D6D6 16 September 1971 J. GibsonC. U. Cesco El Leoncito (1919) Clemence 1971 SA1970 EA 11971 QZ Gerald Clemence(astronomer) main-belt(inner)Hungaria 4 September 2017 (JD 2458000.5) 0 46.23 yr (16,884 days) 2.1200 AU 1.7522 AU 1.9361 AU 0.0950 2.69 yr (984 days) 286.44° 0.3659 ms / day 19.337° 357.00° 99.880° 3.238 0.015 km3.276 0.0104.95 km (calculated) 67.4 0.1 h (revised)68.5 0.1 h (original) 0.3 (assumed)0.686 0.1080.7103 0.0672 Tholen = XXEB–V = 0.750U–B = 0.254 13.45 1919 Clemence, provisional designation 1971 SA, is a bright Hungaria asteroid and suspected tumbler from the inner regions of the asteroid belt, approximately 4 kilometers in diameter. It was discovered on 16 September 1971, by American astronomer James Gibson together with Argentine astronomer Carlos Cesco at the Yale-Columbia Southern Station at Leoncito Astronomical Complex in Argentina. It is named after astronomer Gerald Clemence. Orbit and classification Clemence is a member of the Hungaria family, which form the innermost dense concentration of asteroids in the Solar System. It orbits the Sun at a distance of 1.8–2.1 AU once every 2 years and 8 months (984 days). Its orbit has an eccentricity of 0.10 and an inclination of 19° with respect to the ecliptic. Physical characteristics In the Tholen taxonomic scheme, Clemence is classified as an X-type asteroid. It has also been characterized as an E-type asteroid by the NEOWISE mission. Rotation period In March 2005, a rotational lightcurve was obtained by American astronomer Brian Warner at his Palmer Divide Observatory (716) in Colorado. Lightcurve analysis gave a rotation period of 67.4 0.1 hours and a brightness variation of 0.15 magnitude (U=2, revised analysis). While not being a slow rotator, Clemence has a significantly longer period than most other asteroids, which typically have a spin rate between 2 and 20 hours. Czech astronomer Petr Pravec from the Ondřejov Observatory believes this may be a tumbling asteroid, yet observations are not sufficient to determine a non-principal axis rotation. Diameter and albedo According to the surveys carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 3.2 kilometers in diameter and its surface has an outstandingly high albedo of 0.71, while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.30 and calculates a somewhat larger diameter of 4.95 kilometers with an absolute magnitude of 13.45. Naming This minor planet was named after American astronomer Gerald Maurice Clemence (1908–1974), first scientific director of the United States Naval Observatory and professor of astronomy at the Yale Observatory, known for his work on the theory of the motion of Mars and Mercury, on the system of astronomical constants, and other research in celestial mechanics. He served as president of the American Astronomical Society and of IAU. The official 1919 naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3937). References 30em 2016-05-28 last obs. JPL Small-Body Database Browser: 1919 Clemence (1971 SA) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001919 Jet Propulsion Laboratory 9 June 2017 Dictionary of Minor Planet Names – (1919) Clemence Schmadel Lutz D. Springer Berlin Heidelberg 154 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1920 (1919) Clemence 1919 Clemence (1971 SA) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1919 19 April 2016 Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008) 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 6 Joseph R. Masiero T. Grav A. K. Mainzer C. R. Nugent J. M. Bauer R. Stevenson S. Sonnett August 2014 Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M The Astrophysical Journal 791 2 11 2014ApJ...791..121M 10.1088/0004-637X/791/2/121 1406.6645 21 March 2017 1919 19 April 2016 6 A. Mainzer T. Grav J. Masiero E. Hand J. Bauer D. Tholen R. S. McMillan T. Spahr R. M. Cutri E. Wright J. Watkins W. Mo C. Maleszewski November 2011 NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...90M The Astrophysical Journal 741 2 25 2011ApJ...741...90M 10.1088/0004-637X/741/2/90 1109.6407 19 April 2016 Warner, Brian D. September 2005 Asteroid lightcurve analysis at the Palmer Divide Observatory - winter 2004-2005 http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2005MPBu...32...54W The Minor Planet Bulletin 32 3 54–58 1052-8091 2005MPBu...32...54W 19 April 2016 Brian D. Warner Robert, D. Stephens Alan W. Harris Petr Pravec October 2009 A Re-examination of the Lightcurves for Seven Hungaria Asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2009MPBu...36..176W The Minor Planet Bulletin 36 4 176–179 1052-8091 2009MPBu...36..176W 19 April 2016 6 P. Pravec P. Scheirich J. Durech J. Pollock P. Kusnirák K. Hornoch A. Galád D. Vokrouhlický A. W. Harris E. Jehin J. Manfroid C. Opitom M. Gillon F. Colas J. Oey J. Vrastil D. Reichart K. Ivarsen J. Haislip A. LaCluyze May 2014 The tumbling spin state of (99942) Apophis http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014Icar..233...48P Icarus 233 48–60 2014Icar..233...48P 10.1016/j.icarus.2014.01.026 19 April 2016 External links 3Kn3s98KRYw The Palmer Divide Observatory: Tour given by Brian Warner (time 4:03 min.) Lightcurve plot of 1919 Clemence, Palmer Divide Observatory, B. D. Warner (2005) Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20110721225144/http://www.minorplanet.info/lightcurvedatabase.html 21 July 2011 ) 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 1919 1918 Aiguillon 1919 1920 Sarmiento 001919 Category:Discoveries by James B. Gibson (astronomer) Category:Discoveries by Carlos Ulrrico Cesco Category:Named minor planets 001919 19710916