1995 Hajek

Metallic main-belt asteroid October 2019 yes 1995 Hajek #D6D6D6 26 October 1971 L. Kohoutek Bergedorf Obs. (1995) Hajek 1971 UP 11941 EA Tadeáš Hájek (astronomer) main-belt(middle) 4 September 2017 (JD 2458000.5) 0 76.21 yr (27,836 days) 2.6677 AU 2.3911 AU 2.5294 AU 0.0547 4.02 yr (1,469 days) 6.1573° 0.2450 ms / day 10.825° 47.232° 134.65° 6.50 km (calculated)12.683 0.288 km14.45 2.58 km15.29 1.04 km 10 h 0.040 0.0250.063 0.0100.0833 0.02490.20 (assumed) PX 12.8013.06 0.3313.3 1995 Hajek, provisional designation 1971 UP 1, is a metallic asteroid from the middle region of the asteroid belt, approximately 13 kilometers in diameter. It was discovered on 26 October 1971 by Czech astronomer Luboš Kohoutek at the Bergedorf Observatory in Hamburg, Germany. It was named after Renaissance astronomer Tadeáš Hájek. Orbit and classification Hajek orbits the Sun in the middle main-belt at a distance of 2.4–2.7 AU once every 4.02 years (1,469 days). Its orbit has an eccentricity of 0.05 and an inclination of 11° with respect to the ecliptic. It was first identified as 1941 EA at Heidelberg in 1941. The body's used observation was a precovery taken at Palomar Observatory in 1951, extending its observation arc by 20 years prior to the official discovery observation at Heidelberg. Physical characteristics A first rotational lightcurve of Hajek was obtained by French amateur astronomers Alain Klotz, Marc Rieugné, and Pierre Thierry in October 2013. It gave a provisional rotation period of 10 hours with a brightness variation of 0.10 magnitude (U=1+). Hajek has the spectral properties of a metallic X-type asteroid. It is also classified as a dark P-type asteroid by NASA's Wide-field Infrared Survey Explorer (WISE). According to the surveys carried out by the Japanese Akari satellite and WISE space-telescope with its subsequent NEOWISE mission, Hajek measures between 12.7 and 15.3 kilometers in diameter and its surface has an albedo of 0.040 and 0.083. The Collaborative Asteroid Lightcurve Link strongly disagrees with the space-based observations and assumes a standard albedo for stony asteroids of 0.200 and calculates a much smaller diameter of 6.5 kilometers. These contrasting albedo and diameter figures closely correspond to a generic magnitude-to-diameter conversion, where, for an absolute magnitude of 13.3, the body's diameter is in the range of 6 to 14 kilometers, based on an albedo between 0.05 and 0.25. Naming This minor planet was named after the Bohemian astronomer Tadeáš Hájek (1525–1600), better known by his Latinized name, Thaddaeus Hagecius. He was one of the founders of modern stellar and cometary astronomy, who studied the Great Comet of 1577 and the supernova SN 1572. The lunar crater Hagecius is also named in his honour. The official 1995 naming citation was published by the Minor Planet Center on 1 April 1978 (M.P.C. 4358). References 30em 2017-06-04 last obs. JPL Small-Body Database Browser: 1995 Hajek (1971 UP1) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001995 https://web.archive.org/web/20161220081623/http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001995 20 December 2016 Jet Propulsion Laboratory 1 July 2017 Dictionary of Minor Planet Names – (1995) Hajek Schmadel Lutz D. Springer Berlin Heidelberg 161 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1996 (1995) Hajek 1995 Hajek (1971 UP1) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1995 8 December 2016 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 2009dmpn.book.....S Asteroids and comets rotation curves – (1995) Hajek Behrend Raoul Geneva Observatory http://obswww.unige.ch/~behrend/page4cou.html#001995 8 December 2016 3 August 2003 https://web.archive.org/web/20030803183423/http://obswww.unige.ch/~behrend/page4cou.html#001995 dead Asteroid Size Estimator CNEOS NASA/JPL https://cneos.jpl.nasa.gov/tools/ast_size_est.html 21 October 2019 Xu, Shui Binzel, Richard P. Burbine, Thomas H. Bus, Schelte J. May 1995 Small main-belt asteroid spectroscopic survey: Initial results http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1995Icar..115....1X Icarus 115 1 1–35 0019-1035 1995Icar..115....1X 10.1006/icar.1995.1075 17 December 2015 1995 8 December 2016 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 (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 35447010 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 46350317 8 December 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 1506.00762 53493339 8 December 2016 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 http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M The Astrophysical Journal 741 2 20 2011ApJ...741...68M 10.1088/0004-637X/741/2/68 1109.4096 118745497 8 December 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 1995 1994 Shane 1995 1996 Adams 001995 Category:Discoveries by Luboš Kohoutek Category:Named minor planets 001995 19711026