1693 Hertzsprung

Main-belt asteroid October 2019 yes 1693 Hertzsprung #D6D6D6 001693-asteroid shape model (1693) Hertzsprung.png Shape model of Hertzsprung from its lightcurve 5 May 1935 H. van Gent Johannesburg Obs.(Leiden Southern Station) (1693) Hertzsprung 1935 LA1930 HG1944 HA1950 VM Ejnar Hertzsprung(chemist, astronomer) main-belt(central) 4 September 2017 (JD 2458000.5) 0 81.90 yr (29,914 days) 3.5603 AU 2.0306 AU 2.7955 AU 0.2736 4.67 yr (1,707 days) 164.16° 0.2109 ms / day 11.942° 69.989° 234.93° 30.95 8.6435.27 0.47 km37.772 0.32038.67 1.5 km (IRAS:5)39 4 km40.396 0.972 km41.97 3.65 8.825 h 0.03 0.010.0330 0.00340.0484 0.004 (IRAS:5)0.05 0.010.05 0.050.051 0.0110.059 0.002 Tholen = CBUPCB–V = 0.762U–B = 0.358 10.9711.39 0.82 1693 Hertzsprung (prov. designation: 1935 LA) is a dark and elongated background asteroid from the middle region of the asteroid belt, approximately 39 kilometers in diameter. It was discovered on 5 May 1935, by Dutch astronomer Hendrik van Gent at the Leiden Southern Station, annex to the Johannesburg Observatory in South Africa. Classification and orbit Hertzsprung orbits the Sun in the central main-belt at a distance of 2.0–3.6 AU once every 4 years and 8 months (1,707 days). Its orbit has an eccentricity of 0.27 and an inclination of 12° with respect to the ecliptic. The asteroid was already observed as 1930 HG at Crimea-Simeis in 1930. This observation, however, remained unused and the body's observation arc begins with its official discovery observation at Johannesburg in 1935. Naming This minor planet was named in memory of Danish chemist and astronomer Ejnar Hertzsprung (1873–1967), best known for the famous Hertzsprung–Russell diagram, a spectral classification system for stars he developed jointly with Russel, after whom the asteroid 1762 1762 Russell was named. From 1934 to 1945, Hertzsprung was the head of the Leiden Observatory in the Netherlands. As a prominent expert in photometry, he initiated a survey of variable stars in the Southern Milky Way at the Leiden Southern Station. A number of asteroids and comets were also discovered during the course of this survey. The asteroid's name was suggested by the staff at Leiden Observatory. The official 1693 naming citation was published by the Minor Planet Center on 15 December 1967 (M.P.C. 2822). Physical characteristics Diameter and albedo According to the space-based surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Hertzsprung measures between 30.95 and 41.97 kilometers in diameter and its surface has an albedo between 0.03 and 0.059. The Collaborative Asteroid Lightcurve Link agrees with the results obtained by IRAS, that is an albedo of 0.048 and a diameter of 38.7 kilometers with an absolute magnitude of 10.97. While the dark C-type asteroid is classified as a rare CBU-subtype on the Tholen taxonomic scheme, the NEOWISE mission groups the body to the rare and reddish P-type asteroids. Rotation and shape In August 1987, a rotational lightcurve of Hertzsprung was obtained from photometric observations made with the ESO 1-metre telescope at La Silla Observatory in Chile. The lightcurve gave it a well-defined rotation period of 8.825 hours with a brightness amplitude of 0.45 magnitude (U=3). Observations by the NEOWISE mission found higher amplitudes of 0.70 and 1.05, which indicates that the body has a non-spheroidal or elongated shape. References 30em 2017-03-29 last obs. JPL Small-Body Database Browser: 1693 Hertzsprung (1935 LA) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001693 Jet Propulsion Laboratory 1 July 2017 Dictionary of Minor Planet Names – (1693) Hertzsprung Schmadel Lutz D. Springer Berlin Heidelberg 135 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1694 (1693) Hertzsprung 1693 Hertzsprung (1935 LA) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1693 16 May 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 1693 16 May 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 – IRAS-A-FPA-3-RDR-IMPS-V6.0 2004PDSS...12.....T 17 October 2019 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. 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May 1992 Rotational properties of small asteroids - Photoelectric observations http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1992AJ....103.1679B Astronomical Journal 103 1679–1686 0004-6256 1992AJ....103.1679B 10.1086/116185 10 November 2015 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 16 May 2016 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 119293330 8 December 2016 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 9341381 20 April 2017 6 C. R. Nugent A. Mainzer J. Bauer R. M. Cutri E. A. Kramer T. Grav J. Masiero S. Sonnett E. L. Wright September 2016 NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos The Astronomical Journal 152 3 12 2016AJ....152...63N 10.3847/0004-6256/152/3/63 1606.08923 free 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/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 1693 1692 Subbotina 1693 1694 Kaiser 001693 Category:Discoveries by Hendrik van Gent Category:Named minor planets 001693 19350505