1844 Susilva

Stony Eoan asteroid October 2019 yes 1844 Susilva #D6D6D6 30 October 1972 P. Wild Zimmerwald Obs. (1844) Susilva 1972 UB1943 EU1953 AA1959 GJ Susi Petit–Pierre(friend of discoverer) main-beltEos 4 September 2017 (JD 2458000.5) 0 64.40 yr (23,521 days) 3.1714 AU 2.8587 AU 3.0150 AU 0.0518 5.24 yr (1,912 days) 70.711° 0.1883 ms / day 11.788° 99.365° 73.564° 19.022 0.232 km22.41 km (calculated)26.800 0.321 km 0.118 0.0110.14 (assumed)0.2358 0.0545 S 10.811.011.49 0.44 1844 Susilva, provisional designation 1972 UB, is a stony Eoan asteroid from the outer region of the asteroid belt, approximately 22 kilometers in diameter. It was discovered on 30 October 1972, by Swiss astronomer Paul Wild at Zimmerwald Observatory near Bern, Switzerland, and later named after a schoolfriend of the discoverer. Classification and orbit Susilva is a member of the Eos family, a collisional group of more than 4,000 asteroids, which are well known for mostly being of silicaceous composition. It orbits the Sun in the outer main-belt at a distance of 2.9–3.2 AU once every 5 years and 3 months (1,912 days). Its orbit has an eccentricity of 0.05 and an inclination of 12° with respect to the ecliptic. First identified as 1943 EU at Turku Observatory, Susilvas first used observation was taken at Uccle Observatory in 1953, extending the body's observation arc by 19 years prior to its official discovery observation. Physical characteristics According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures between 19.0 and 26.8 kilometers in diameter, and its surface has an albedo of 0.118 to 0.236. The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.14, taken from 221 Eos, the family's largest member and namesake – and calculates a diameter of 22.4 kilometers based on an absolute magnitude of 11.0. Susilvas rotation period has not yet been measured. Naming The discoverer named a pair of asteroids after two of his former schoolmates, Susi and Helen, both from the small village of Wald, Zürich in Switzerland. This one was dedicated to Susi Petit–Pierre, while the subsequently numbered asteroid, 1845 Helewalda, was given to Helen Gachnang. The official 1844 naming citation was published by the Minor Planet Center on 18 April 1977 (M.P.C. 4156). References 2017-06-05 last obs. JPL Small-Body Database Browser: 1844 Susilva (1972 UB) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001844 https://web.archive.org/web/20200918060700/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001844 dead 18 September 2020 Jet Propulsion Laboratory 1 July 2017 Dictionary of Minor Planet Names – (1844) Susilva Schmadel Lutz D. Springer Berlin Heidelberg 148 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1845 (1844) Susilva 1844 Susilva (1972 UB) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1844 1 March 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 1844 1 March 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 1 March 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 1 March 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 1 March 2016 1506.00762 Himmlischer Besuch auf der Sternwarte Eschenberg Helen Gachnang and Susi Petit-Pierre visit the Eschenberg Observatory German Sternwarte Eschenberg http://www.eschenberg.ch/sternwarte.php?sec=hd 1 March 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 1844 1843 Jarmila 1844 1845 Helewalda 001844 Category:Discoveries by Paul Wild (Swiss astronomer) Category:Named minor planets 19721030