1389 Onnie

Asteroid October 2019 yes 1389 Onnie #D6D6D6 260px Light-curve-based 3D-model of Onnie padding: 5px 0; line-height: 1.3em; 28 September 1935 H. van Gent Johannesburg Obs.(Leiden Southern Station) (1389) Onnie 1935 SS 11949 QV 11955 XB 1 A. Kruyt (relative of G. Pels) main-beltKoronis 16 February 2017 (JD 2457800.5) 0 80.87 yr (29,539 days) 2.9118 AU 2.8183 AU 2.8650 AU 0.0163 4.85 yr (1,771 days) 183.28° 0.2032 ms / day 2.0480° 174.57° 297.53° 12.46 km (derived)13.772 0.184 km14.737 0.159 km 22.5 h23.0447 0.0005 h 0.1734 0.03870.198 0.0160.24 (assumed) B–V = 0.810LSS 11.6411.6911.74 0.40 1389 Onnie, provisional designation 1935 SS 1, is a stony Koronian asteroid from the outer region of the asteroid belt, approximately 13 kilometers in diameter. It was discovered on 28 September 1935, by Dutch astronomer Hendrik van Gent at Leiden Southern Station, annex to the Johannesburg Observatory in South Africa. Orbit and classification The stony S-type asteroid belongs to the Koronis family, a group consisting of few hundred known bodies with nearly ecliptical orbits. Onnie orbits the Sun at a distance of 2.8–2.9 AU once every 4 years and 10 months (1,771 days). Its orbit has an eccentricity of 0.02 and an inclination of 2° with respect to the ecliptic. As no precoveries were taken, and no prior identifications were made, the body's observation arc begins with its official discovery observation at Johannesburg. Lightcurve American astronomer Richard P. Binzel obtained a rotational light-curve of Onnie from photometric observations in September 1983. It gave a longer-than average rotation period of 22.5 hours with a change in brightness of 0.34 magnitude (U=2). In 2011 and 2013, respectively, a modeled light-curve using data from the Uppsala Asteroid Photometric Catalogue and other sources gave a period 23.0447 hours, as well as a spin axis of (183.0°, -75.0°) in ecliptic coordinates (U=n.a.). Diameter and albedo According to the 2014-published result by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Onnie measures 13.77 kilometers in diameter, and its surface has an albedo of 0.198. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony Koronian asteroids of 0.24 and derives a diameter of 12.46 kilometers based on an absolute magnitude of 11.69. Naming This minor planet was named for A. Kruyt, sister-in-law of astronomer G. Pels (1893–1966). Pels, who proposed the minor planet's name, was as a lifelong member of the Leiden Observatory's staff, observer of minor planets at Leiden, as well as an orbit computer for many of Hendrik van Gent's made discoveries. The minor planet 1667 Pels was named in his honour. References 2016-08-12 last obs. JPL Small-Body Database Browser: 1389 Onnie (1935 SS1) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001389 Jet Propulsion Laboratory 11 January 2017 Dictionary of Minor Planet Names – (1389) Onnie Schmadel Lutz D. Springer Berlin Heidelberg 112 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1390 (1389) Onnie Dictionary of Minor Planet Names – (1667) Pels Schmadel Lutz D. Springer Berlin Heidelberg 132 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1668 (1667) Pels 1389 Onnie (1935 SS1) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1389 11 January 2017 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 11 January 2017 1389 11 January 2017 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 Binzel, R. P. October 1987 A photoelectric survey of 130 asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1987Icar...72..135B Icarus 72 1 135–208 0019-1035 1987Icar...72..135B 10.1016/0019-1035(87)90125-4 11 January 2017 6 Hanus, J. Durech, J. Broz, M. Warner, B. D. Pilcher, F. Stephens, R. Oey, J. Bernasconi, L. Casulli, S. Behrend, R. Polishook, D. Henych, T. Lehký, M. 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Wücher March 2013 Asteroids' physical models from combined dense and sparse photometry and scaling of the YORP effect by the observed obliquity distribution http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013A&A...551A..67H Astronomy and Astrophysics 551 16 2013A&A...551A..67H 10.1051/0004-6361/201220701 1301.6943 11 January 2017 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 11 January 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 1389 1388 Aphrodite 1389 1390 Abastumani 001389 Category:Discoveries by Hendrik van Gent Category:Named minor planets 19350928