1272 Gefion

Main-belt asteroid October 2019 yes 1272 Gefion #D6D6D6 K. Reinmuth Heidelberg Obs. 10 October 1931 (1272) Gefion 1931 TZ 1A917 SF ' g eɪ f i ɒ n or ' g ɛ f i ɒ nJoseph Thomas (1915) Universal Pronouncing Dictionary of Biography and Mythology Gefionian g ɛ f i ' oʊ n i @ nCharles Dickens, ed. 1861. All the year round, 4:445. Gefjon(Norse mythology) main-belt(middle)Gefion 4 September 2017 (JD 2458000.5) 0 99.50 yr (36,344 days) 3.2076 AU 2.3604 AU 2.7840 AU 0.1521 4.65 yr (1,697 days) 215.36° 0.2122 ms / day 8.4185° 321.56° 3.6671° 6.965 0.169 km7.016 0.066 km12.62 km (calculated) 2.900 0.0012 h3.087 0.0005 h 0.057 (assumed)0.2489 0.02560.252 0.041 SMASS SlC (assumed) 12.785 0.005 (R)12.913.013.01 0.2113.22 1272 Gefion, provisional designation 1931 TZ 1, is a stony asteroid and parent body of the Gefion family from the central region of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 10 October 1931, by astronomer Karl Reinmuth at the Heidelberg Observatory in Germany. The asteroid was named after Gefjon from Norse mythology. Orbit and classification Gefion is the namesake and parent body of the Gefion family (516), a large family of stony asteroids in the intermediate main belt.23 The family is also a suspected source of the L chondrites, common group of meteorites. It orbits the Sun in the central main-belt at a distance of 2.4–3.2 AU once every 4 years and 8 months (1,697 days; semi-major axis of 2.78 AU). Its orbit has an eccentricity of 0.15 and an inclination of 8° with respect to the ecliptic. The asteroid was first identified as A917 SF at Heidelberg in September 1917. The body's observation arc begins at Heidelberg, six days after its official discovery observation. Physical characteristics In the SMASS classification, Gefion is a Sl-subtype that transitions from the common stony S-type asteroids to the rather rare L-types. Rotation period In 2010 and 2011, two rotational lightcurves of Gefion were obtained from photometric observations in the R-band by astronomers at the Palomar Transient Factory in California . Lightcurve analysis gave a rotation period of 2.900 and 3.087 hours with a brightness amplitude of 0.22 and 0.20 magnitude, respectively (U=2/2). Diameter and albedo According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Gefion measures between 6.965 and 7.016 kilometers in diameter and its surface has an albedo between 0.2489 and 0.252. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and consequently calculates a much larger diameter of 12.62 kilometers based on an absolute magnitude of 13.22. Naming This minor planet was named after Gefjon a goddess in Norse mythology. It is also named for the Gefion Fountain in Copenhagen, Denmark. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 117). References 30em 2017-03-29 last obs. JPL Small-Body Database Browser: 1272 Gefion (1931 TZ1) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001272 Jet Propulsion Laboratory 17 November 2017 Schmadel Lutz D. Dictionary of Minor Planet Names Springer Berlin Heidelberg 105 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1273 (1272) Gefion 1272 Gefion (1931 TZ1) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1272 17 November 2017 6 Joseph R. Masiero A. K. Mainzer T. Grav J. M. Bauer R. M. Cutri J. Dailey P. R. M. Eisenhardt R. S. McMillan T. B. Spahr M. F. Skrutskie D. Tholen R. G. Walker E. L. Wright E. DeBaun D. Elsbury T. IV Gautier S. Gomillion A. Wilkins November 2011 Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M The Astrophysical Journal 741 2 20 2011ApJ...741...68M 10.1088/0004-637X/741/2/68 1109.4096 17 November 2017 Asteroid 1272 Gefion – Nesvorny HCM Asteroid Families V3.0 Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1272+Gefion#Asteroid%201272%20GefionEAR-A-VARGBDET-5-NESVORNYFAM-V3.0 26 October 2019 https://web.archive.org/web/20200819223713/https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1272+Gefion#Asteroid%201272%20GefionEAR-A-VARGBDET-5-NESVORNYFAM-V3.0 19 August 2020 dead D. Nesvorný M. Broz V. Carruba December 2014 Identification and Dynamical Properties of Asteroid Families Asteroids IV 297–321 2015aste.book..297N 10.2458/azu_uapress_9780816532131-ch016 1502.01628 978-0-8165-3213-1 David Nesvorný David Vokrouhlický Alessandro Morbidelli William F. Bottke April 2009 Asteroidal source of L chondrite meteorites http://astro.mff.cuni.cz/davok/papers/Lchondrites_2009.pdf Icarus 200 2 698–701 2009Icar..200..698N 10.1016/j.icarus.2008.12.016 17 November 2017 1272 17 November 2017 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 The Astrophysical Journal 741 2 25 2011ApJ...741...90M 10.1088/0004-637X/741/2/90 1109.6407 6 Adam Waszczak Chan-Kao Chang Eran O. Ofek Russ Laher Frank Masci David Levitan Jason Surace Yu-Chi Cheng Wing-Huen Ip Daisuke Kinoshita George Helou Thomas A. Prince Shrinivas Kulkarni September 2015 Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015AJ....150...75W The Astronomical Journal 150 3 35 2015AJ....150...75W 10.1088/0004-6256/150/3/75 1504.04041 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 17 November 2017 External links Is the Gefion Dynamical Asteroid Family the Source of the LChondrites?, 78th Annual Meeting of the Meteoritical Society (2015) 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 1272 1271 Isergina 1272 1273 Helma 001272 Category:Discoveries by Karl Wilhelm Reinmuth Category:Named minor planets 001272 19311010