1251 Hedera

Main-belt asteroid October 2019 yes 1251 Hedera #D6D6D6 001251-asteroid shape model (1251) Hedera.png Modelled shape of Hedera from its lightcurve K. Reinmuth Heidelberg Obs. 25 January 1933 (1251) Hedera 1933 BE1929 CD 11931 TJ 21975 NW 1A907 GDA915 CA ˈ h ɛ d ə r əhederal Hedera (a.k.a. "Ivy") main-belt(middle)background 4 September 2017 (JD 2458000.5) 0 102.80 yr (37,548 days) 3.1452 AU 2.2884 AU 2.7168 AU 0.1577 4.48 yr (1,636 days) 55.862° 0.2201 ms / day 6.0489° 140.65° 217.52° 13.239 0.150 km44.22 km (calculated) 15.015 0.010 h19.9000 0.0002 h19.9020 0.0001 h19.9020 0.0002 h19.915 0.005 h19.915 0.007 h19.985 0.002 h 0.057 (assumed)0.636 0.050 Tholen ESMASS XEC(SDSS-MFB)B–V 0.689U–B 0.233 10.510.67 0.28 1251 Hedera (prov. designation: 1933 BE) is a background asteroid from the central regions of the asteroid belt, approximately 13 km mi off 1 us in diameter. It was discovered on 25 January 1933, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. The asteroid was named for the climbing plant Hedera, commonly known as "ivy". Orbit and classification Hedera is a non-family asteroid from the main belt's background population. It orbits the Sun in the central asteroid belt at a distance of 2.3–3.1 AU once every 4 years and 6 months (1,636 days; semi-major axis of 2.72 AU). Its orbit has an eccentricity of 0.16 and an inclination of 6° with respect to the ecliptic. The asteroid was first observed as A907 GD at Heidelberg in April 1907. The body's observation arc begins at Heidelberg, the night after its official discovery observation. Naming This minor planet was named after the evergreen woody plant Hedera ("ivy") a genus of climbing or ground-creeping woody plants in the aralia family (ivy family). The 1251 naming was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 115). Reinmuth's flowers Due to his many discoveries, Karl Reinmuth submitted a large list of 66 newly named asteroids in the early 1930s. The list covered his discoveries with numbers between 1009 (1009) and 1200 (1200). This list also contained a sequence of 28 asteroids, starting with 1054 Forsytia, that were all named after plants, in particular flowering plants (also see list of minor planets named after animals and plants). Physical characteristics Hedera is an E-type and X-type asteroid in the Tholen and SMASS classification, respectively. Rotation period Several rotational lightcurves of Hedera have been obtained from photometric observations since 2007. Best-rated lightcurve by Julian Oey at Kingsgrove and Leura observatories, Australia, gave a rotation period of 19.9000 hours with a consolidated brightness amplitude between 0.41 and 0.61 magnitude (U=3-). Spin axis Modeled photometric data from the Lowell Photometric Database (LPD) and the robotic BlueEye600 Observatory, gave a concurring period of 19.9020 hours, Both studies determined two spin axes of (124.0°, −70.0°) and (266.0°, −62.0°), as well as (271.0°, −53.0°) and (115.0°, −62.0°) in ecliptic coordinates (λ, β). Diameter and albedo According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Hedera measures 13.239 kilometers in diameter and its surface has an albedo of 0.636. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and consequently calculates a larger diameter of 44.22 kilometers based on an absolute magnitude of 10.50. References 30em 2017-11-24 last obs. JPL Small-Body Database Browser: 1251 Hedera (1933 BE) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001251 Jet Propulsion Laboratory 31 December 2017 Dictionary of Minor Planet Names https://archive.org/details/dictionaryminorp00schm limited Schmadel Lutz D. Springer Berlin Heidelberg (1251) Hedera 104 2003 978-3-540-00238-3 10.1007/978-3-540-29925-7_1252 Dictionary of Minor Planet Names https://archive.org/details/dictionaryminorp00schm limited Schmadel Lutz D. Springer Berlin Heidelberg (1054) Forsytia 90 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1055 1251 Hedera (1933 BE) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1251 31 December 2017 Asteroids and comets rotation curves – (1251) Hedera Behrend Raoul Geneva Observatory http://obswww.unige.ch/~behrend/page3cou.html#001251 31 December 2017 23 April 2019 https://web.archive.org/web/20190423121547/http://obswww.unige.ch/~behrend/page3cou.html#001251 dead 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 The Astrophysical Journal 741 2 20 2011ApJ...741...68M 10.1088/0004-637X/741/2/68 1109.4096 Asteroid 1251 Hedera – Proper Elements AstDyS-2, Asteroids – Dynamic Site https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=1251 29 October 2019 1251 31 December 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 Oey Julian September 2008 Lightcurve Analysis of Asteroids from the Kingsgrove and Leura Observatories in the 2nd Half of 2007 Minor Planet Bulletin http://www.minorplanet.info/MPB/issues/MPB_35-3.pdf 35 3 132–135 2008MPBu...35..132O 1052-8091 https://web.archive.org/web/20200820104842/http://www.minorplanet.info/MPB/issues/MPB_35-3.pdf 20 August 2020 15 March 2020 dead V. G. Shevchenko Yu. N. Krugly V. G. Chiorny I. N. Belskaya N. M. Gaftonyuk August 2003 Rotation and photometric properties of E-type asteroids Planetary and Space Science 51 9–10 525–532 2003P&SS...51..525S 10.1016/S0032-0633(03)00076-X J. Durech J. Hanus D. Oszkiewicz R. Vanco March 2016 Asteroid models from the Lowell photometric database Astronomy and Astrophysics 587 6 2016A&A...587A..48D 10.1051/0004-6361/201527573 1601.02909 V. G. Chiorny V. G. Shevchenko Yu. N. Krugly F. P. Velichko N. M. Gaftonyuk May 2007 Photometry of asteroids: Lightcurves of 24 asteroids obtained in 1993 2005 Planetary and Space Science 55 7–8 986–997 2007P&SS...55..986C 10.1016/j.pss.2007.01.001 https://zenodo.org/record/998054 6 Josef Durech Josef Hanus Miroslav Broz Martin Lehky Raoul Behrend Pierre Antonini Stephane Charbonnel Roberto Crippa Pierre Dubreuil Gino Farroni Gilles Kober Alain Lopez Federico Manzini Julian Oey Raymond Poncy Claudine Rinner Rene Roy July 2017 Shape models of asteroids based on lightcurve observations with BlueEye600 robotic observatory Icarus 304 101–109 1707.03637 10.1016/j.icarus.2017.07.005 2018Icar..304..101D 6 I. N. Belskaya S. Fornasier G. P. Tozzi R. Gil-Hutton A. Cellino K. Antonyuk Yu. N. Krugly A. N. Dovgopol S. Faggi March 2017 Refining the asteroid taxonomy by polarimetric observations Icarus 284 30–42 2017Icar..284...30B 10.1016/j.icarus.2016.11.003 11336/63617 free 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 External links Lightcurve Database Query (LCDB), at www.minorplanet.info 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 – Geneva Observatory, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 1251 1250 Galanthus 1251 1252 Celestia 001251 Category:Discoveries by Karl Wilhelm Reinmuth Category:Named minor planets 001251 001251 19330125