113390 Helvetia

Main-belt asteroid February 2019 yes 113390 Helvetia #D6D6D6 M. Griesser Eschenberg Obs. 29 September 2002 (113390) Helvetia 2002 SU 192001 FS 166 h ɛ l ' v i: ʃ ə Helvetia (Swiss symbol and national personification) main-belt(inner)backgroundFlora 27 April 2019 (JD 2458600.5) 0 57.45 yr (20,985 d) 2.7712 AU 1.8353 AU 2.3033 AU 0.2032 3.50 yr (1,277 d) 314.06° 0.2820 ms / day 7.3588° 298.47° 8.6509° 2.196 0.360 0.231 0.103 S (assumed) 15.515.6 113390 Helvetia (provisional designation 2002 SU 19) is a background asteroid from the inner regions of the asteroid belt, approximately 2.2 km mi off us kilometers in diameter. It was discovered on 29 September 2002, by Swiss astronomer Markus Griesser at the Eschenberg Observatory in Winterthur, near Zürich, Switzerland. The presumed stony Florian asteroid was named after the Swiss national symbol, Helvetia. Orbit and classification Helvetia is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements. Based on osculating Keplerian orbital elements, the asteroid has also been classified as a member of the Flora family (402), a giant asteroid family and the largest family of stony asteroids in the main-belt. It orbits the Sun in the inner main-belt at a distance of 1.8–2.8 AU once every 3 years and 6 months (1,276 days; semi-major axis of 2.3 AU). Its orbits the Sun in the inner main-belt at a distance of 1.8–2.8 AU once every 3 years and 6 months (1,277 days; semi-major axis of 2.3 AU). Its orbit has an eccentricity of 0.20 and an inclination of 7° with respect to the ecliptic. The asteroid's observation arc begins 42 years prior to its official discovery observation, with a precovery taken at the Palomar Observatory in September 1960. Naming This minor planet bears the name for Switzerland (la Confoederatio Helvetica), where the asteroid was discovered. Helvetia is also an allegorical figure and symbol for the nation (national personification). Each Swiss stamp carries her name, and her figure appears on most Swiss coins. The official 113390 naming citation was published by the Minor Planet Center on 19 February 2006 (M.P.C. 55989). Physical characteristics Helvetia is an assumed, stony S-type asteroid, the most common type in the inner main-belt and the Flora family's overall spectral type. Lightcurve In April 2014, Helvetia was photometrically observed by Hungarian astronomers Gyula M. Szabó and Krisztián Sárneczky. However, no rotational lightcurve could be obtained. As of 2019, the asteroid's rotation period and shape still remain unknown. Diameter and albedo According to the survey carried out by the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, Helvetia measures 2.2 kilometers in diameter and its surface has an albedo of 0.23, which is typical for stony asteroids. The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the largest member and namesake of its family – and calculates a diameter of 2.06 kilometers based on an absolute magnitude of 15.6. References 30em 2018-03-09 last obs. JPL Small-Body Database Browser: 113390 Helvetia (2002 SU19) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2113390 Jet Propulsion Laboratory 28 February 2019 113390 Helvetia (2002 SU19) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=113390 28 February 2019 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 28 February 2019 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 118745497 Asteroid (113390) Helvetia – Proper elements AstDyS-2, Asteroids – Dynamic Site https://newton.spacedys.com/astdys/index.php?n=113390&pc=1.1.6 28 February 2019 Asteroid 113390 Helvetia Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=113390+Helvetia 28 February 2019 https://web.archive.org/web/20190301074757/https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=113390+Helvetia 1 March 2019 dead 113390 28 February 2019 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 35447010 (catalog) 6 A. K. Mainzer J. M. Bauer R. M. Cutri T. Grav E. A. Kramer J. R. Masiero C. R. Nugent S. M. Sonnett R. A. Stevenson E. L. Wright June 2016 NEOWISE Diameters and Albedos V1.0 https://sbnarchive.psi.edu/pds3/non_mission/EAR_A_COMPIL_5_NEOWISEDIAM_V1_0/data/neowise_mainbelt.tab NASA Planetary Data System EAR-A-COMPIL-5-NEOWISEDIAM-V1.0 2016PDSS..247.....M 28 February 2019 External links Eschenberg Observatory – website Discovery image with HIP 4703 (brightest star) at Eschenberg Observatory (2002) 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 113390 113390 113390 Category:Discoveries by Markus Griesser (astronomer) Category:Named minor planets 20020929