1656 Suomi

Asteroid August 2026 yes 1656 Suomi #FA8072 Y. Väisälä Turku Obs. 11 March 1942 (1656) Suomi 1942 EC1955 HL Finland (country) Mars-crosserHungariabinary 4 September 2017 (JD 2458000.5) 0 75.24 yr d off 2.1093 AU 1.6456 AU 1.8774 AU 0.1235 2.57 yr (940 days) 174.69° 0.3831 ms / day 25.067° 175.57° 287.44° 0.7551 AU 1 1.98+ km (> 0.26Ds/Dp; P: 57.92 h) 7.86 0.7 km (IRAS:3)7.9 km 2.42 0.02 h2.583 0.004 h2.5879 0.0002 h2.5879 0.0003 h2.59 0.01 h62.16 h (wrong) 0.1556 0.032 (IRAS:3)0.157 Tholen = SS 12.912.97 0.3113.13 0.1113.146 0.113.16 1656 Suomi (prov. designation: 1942 EC) is a binary Hungaria asteroid and sizable Mars-crosser from the innermost regions of the asteroid belt. It was discovered on 11 March 1942, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland, who named it "Suomi", the native name of Finland. The stony asteroid has a short rotation period of 2.6 hours and measures approximately 7.9 kilometers in diameter. In June 2020, a companion was discovered by Brian Warner, Robert Stephens and Alan Harris. The satellite measures more than 1.98 kilometers in diameter, about 26% of the primary, which it orbits once every 57.9 hours at an average distance of 30 kilometers. Orbit and classification Suomi 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 1.6–2.1 AU once every 2 years and 7 months (940 days). Its orbit has an eccentricity of 0.12 and an inclination of 25° with respect to the ecliptic. It is also classified as a Mars-crossing asteroid, since its perihelion – the point in its orbit, where it is nearest to the Sun – is less than the average orbital distance of the planet Mars (1.666 AU). Suomis observation arc begins on the preceding night of its discovery, with an observation taken at Johannesburg Observatory on 10 March 1942. Naming As with 1453 Fennia, this minor planet was named after Finland (fi Suomi). The official 1656 naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3932). Physical characteristics In the Tholen taxonomy, Suomi is a stony S-type asteroid. Diameter and albedo According to the survey carried out by the Infrared Astronomical Satellite IRAS, Suomi measures 7.86 kilometers in diameter and its surface has an albedo of 0.156, making it one of the largest Mars crossing asteroid with a known diameter. The Collaborative Asteroid Lightcurve Link (CALL) agrees with IRAS, and adopts an albedo of 0.157 and a diameter of 7.9 kilometers with an absolute magnitude of 13.146. Rotation period Since 1991, a large number of rotational lightcurves of Suomi have been obtained from photometric observations (also see infobox). CALL adopts a rotation period of 2.583 hours with a brightness variation of 0.20 magnitude (U=3). References 30em 2017-06-06 last obs. JPL Small-Body Database Browser: 1656 Suomi (1942 EC) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001656 Jet Propulsion Laboratory 30 June 2017 Dictionary of Minor Planet Names (1656) Suomi Schmadel Lutz D. Springer Berlin Heidelberg 132 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1657 1656 Suomi (1942 EC) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1656 24 December 2016 Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008) Appendix – Publication Dates of the MPCs Schmadel Lutz D. 2009 Springer Berlin Heidelberg 221 978-3-642-01964-7 10.1007/978-3-642-01965-4 2009dmpn.book.....S Asteroids and comets rotation curves – (1656) Suomi Behrend Raoul Geneva Observatory https://obswww.unige.ch/~behrend/page4cou.html#001656 24 December 2016 October 2026 InternetArchiveBot JPL Small-Body Database Search Engine: orbital class (MCA) and diameter > 0 (km) JPL Solar System Dynamics http://ssd.jpl.nasa.gov/sbdb_query.cgi?obj_group=all;obj_kind=all;obj_numbered=all;ast_orbit_class=MCA;OBJ_field=0;ORB_field=0;c1_group=OBJ;c1_item=Ap;c1_op=%3E;c1_value=0;table_format=HTML;max_rows=100;format_option=comp;c_fields=AcBhBgBjBiBnBsAiAp;.cgifields=format_option;.cgifields=ast_orbit_class;.cgifields=table_format;.cgifields=obj_kind;.cgifields=obj_group;.cgifields=obj_numbered;.cgifields=com_orbit_class&query=1&c_sort=ApD 2015-05-26 1656 24 December 2016 W. Z. Wisniewski T. M. Michalowski A. W. Harris R. S. McMillan March 1995 Photoelectric Observations of 125 Asteroids https://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1995LPI....26.1511W Abstracts of the Lunar and Planetary Science Conference 26 1511 1995LPI....26.1511W 24 December 2016 E. F. Tedesco P. V. Noah M. Noah S. D. Price October 2004 IRAS Minor Planet Survey V6.0 https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab NASA Planetary Data System 12 IRAS-A-FPA-3-RDR-IMPS-V6.0 2004PDSS...12.....T 22 October 2019 Stephens, Robert D. December 2004 Photometry of 1196 Sheba, 1341 Edmee, 1656 Suomi, 2577 Litva, and 2612 Kathryn https://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2004MPBu...31...95S The Minor Planet Bulletin 31 4 95–97 1052-8091 2004MPBu...31...95S 24 December 2016 Brinsfield, James W. March 2008 The Rotation Periods of 1465 Autonoma, 1656 Suomi 4483 Petofi, 4853 Marielukac, and (85275) 1994 LY https://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2008MPBu...35...23B The Minor Planet Bulletin 35 1 23–24 1052-8091 2008MPBu...35...23B 24 December 2016 Warner, Brian D. July 2009 Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2008 December - 2009 March https://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2009MPBu...36..109W The Minor Planet Bulletin 36 3 109–116 1052-8091 2009MPBu...36..109W 24 December 2016 Warner, Brian D. October 2012 Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2012 March - June https://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012MPBu...39..245W The Minor Planet Bulletin 39 4 245–252 1052-8091 2012MPBu...39..245W 24 December 2016 Warner, Brian D. July 2014 Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 January–March https://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014MPBu...41..144W The Minor Planet Bulletin 41 3 144–155 32549049 1052-8091 2014MPBu...41..144W 24 December 2016 Warner, Brian D. January 2016 Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2015 June–September https://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016MPBu...43...57W The Minor Planet Bulletin 43 1 57–65 32455368 7244003 1052-8091 2016MPBu...43...57W 24 December 2016 Gerard Faure Lawrence Garret December 2007 Suggested Revised H Values of Selected Asteroids: Report Number 3 https://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2007MPBu...34...95F The Minor Planet Bulletin 34 4 95–99 1052-8091 2007MPBu...34...95F 24 December 2016 Petr Pravec Alan W. Harris Peter Kusnirák Adrián Galád Kamil Hornoch September 2012 Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations https://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012Icar..221..365P Icarus 221 1 365–387 2012Icar..221..365P 10.1016/j.icarus.2012.07.026 24 December 2016 11104/0217021 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 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 24 December 2016 Juan A. Sanchez René Michelsen Vishnu Reddy Andreas Nathues July 2013 Surface composition and taxonomic classification of a group of near-Earth and Mars-crossing asteroids https://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013Icar..225..131S Icarus 225 1 131–140 2013Icar..225..131S 10.1016/j.icarus.2013.02.036 1302.4449 24 December 2016 Robert Johnston (1656) Suomi johnstonsarchive.net 11 October 2020 https://www.johnstonsarchive.net/astro/astmoons/am-01656.html 24 October 2020 Warner Brian D. Stephens Robert D. Harris Alan W. October 2020 Binary Asteroids at the Center for Solar System Studies Minor Planet Bulletin 47 4 305–308 http://www.minorplanet.info/MPB/issues/MPB_47-4.pdf 2020MPBu...47..305W 1052-8091 October 2026 InternetArchiveBot External links Turun Ursa, (in Finnish) Photometric Observations of 125 Asteroids, Wisniewski, Icarus, Volume 126, Issue 2, pp. 395–449. Lightcurve plot of 1656 Suomi, Palmer Divide Observatory, B. D. Warner (2009) 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/20241208174218/http://obswww.unige.ch/~behrend/page_cou.html 8 December 2024 – Observatoire de Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 1656 1655 Comas Solà 1656 1657 Roemera 001656 001656 Category:Discoveries by Yrjö Väisälä Category:Named minor planets 001656 001656 19420311