1541 Estonia

Asteroid from the central regions of the asteroid belt October 2019 yes 1541 Estonia #D6D6D6 Y. Väisälä Turku Observatory 12 February 1939 (1541) Estonia 1939 CK1930 FE1930 FV1950 RG 11950 SR1959 RF 1A916 GEA923 VE Estonia(Baltic country) main-belt(middle) 4 September 2017 (JD 2458000.5) 0 93.57 yr (34,176 days) 2.9610 AU 2.5761 AU 2.7685 AU 0.0695 4.61 yr (1,683 days) 346.22° 0.2140 ms / day 4.8750° 1.4553° 192.84° 19.53 0.40 km20.15 km (derived)20.56 6.71 km22.000 0.342 km23.89 1.35 km24.542 0.096 km 10.1 1.0 h 0.0976 0.01290.104 0.0120.12 0.130.1314 (derived)0.140 0.016 SMASS XcX 11.2011.3011.411.56 0.24 1541 Estonia (provisional designation 1939 CK) is an asteroid from the central regions of the asteroid belt, approximately 21 kilometers in diameter. It was discovered on 12 February 1939, by astronomer Yrjö Väisälä at the Iso-Heikkilä Observatory near Turku, Finland. The asteroid was named after the Baltic country of Estonia. Orbit and classification Estonia is a non-family asteroid from the main belt's background population. It orbits the Sun in the central main belt at a distance of 2.6–3.0 AU once every 4 years and 7 months (1,683 days). Its orbit has an eccentricity of 0.07 and an inclination of 5° with respect to the ecliptic. The asteroid was first identified as A916 GE at the Simeiz Observatory in April 1916. The body's observation arc begins with its identification as A923 VE at Yerkes Observatory in November 1923, more than 15 years prior to its official discovery observation at Turku. Physical characteristics In the SMASS classification, Estonia is an Xc-subtype asteroid; asteroids of the Xc subtype have characteristics intermediate of X-type asteroids and carbonaceous C-type asteroids. Rotation period In November 2015, a rotational lightcurve of Estonia was obtained from photometric observations by French amateur astronomer René Roy. Lightcurve analysis gave a rotation period of 10.1 hours with a brightness amplitude of 0.13 magnitude (U=2-). Diameter and albedo According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Estonia measures between 19.53 and 24.542 kilometers in diameter and its surface has an albedo between 0.0976 and 0.140. The Collaborative Asteroid Lightcurve Link derives an albedo of 0.1314 and a diameter of 20.15 kilometers based on an absolute magnitude of 11.3. Naming This minor planet was named after the Baltic country of Estonia, just south of the Gulf of Finland and Finland itself. The two countries are inhabited by related Balto-Finnic peoples. Estonia regained independence from Soviet rule in 1991. The official 1541 naming citation was published by the Minor Planet Center in January 1956 (M.P.C. 1350). References 30em 2017-06-04 last obs. JPL Small-Body Database Browser: 1541 Estonia (1939 CK) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001541 Jet Propulsion Laboratory 20 September 2017 Dictionary of Minor Planet Names – (1541) Estonia Schmadel Lutz D. Springer Berlin Heidelberg 122 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1542 (1541) Estonia 1541 Estonia (1939 CK) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1541 20 September 2017 Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008) 2009 https://archive.org/details/dictionaryminorp2008schm limited 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 Asteroids and comets rotation curves – (1541) Estonia Behrend Raoul Geneva Observatory http://obswww.unige.ch/~behrend/page4cou.html#001541 20 September 2017 1 April 2019 https://web.archive.org/web/20190401181659/http://obswww.unige.ch/~behrend/page4cou.html#001541 dead 6 Joseph R. Masiero T. Grav A. K. Mainzer C. R. Nugent J. M. Bauer R. Stevenson S. Sonnett August 2014 Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M The Astrophysical Journal 791 2 11 2014ApJ...791..121M 10.1088/0004-637X/791/2/121 1406.6645 20 September 2017 1541 20 September 2017 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 20 September 2017 6 C. R. Nugent A. Mainzer J. Masiero J. Bauer R. M. Cutri T. Grav E. Kramer S. Sonnett R. Stevenson E. L. Wright December 2015 NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015ApJ...814..117N The Astrophysical Journal 814 2 13 2015ApJ...814..117N 10.1088/0004-637X/814/2/117 1509.02522 20 September 2017 6 Fumihiko Usui Daisuke Kuroda Thomas G. Müller Sunao Hasegawa Masateru Ishiguro Takafumi Ootsubo Daisuke Ishihara Hirokazu Kataza Satoshi Takita Shinki Oyabu Munetaka Ueno Hideo Matsuhara Takashi Onaka October 2011 Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey Publications of the Astronomical Society of Japan 63 5 1117–1138 2011PASJ...63.1117U 10.1093/pasj/63.5.1117 free (online, AcuA catalog p. 153) 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 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 20 September 2017 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 1541 1540 Kevola 1541 1542 Schalén 001541 Category:Discoveries by Yrjö Väisälä Category:Named minor planets 001541 19390212