1627 Ivar

Elongated stony asteroid and near-Earth object September 2026 yes 1627 Ivar #FFC2E0 (1627)_Ivar_Light_curve.png Light-curve-based 3D-model of 1627 Ivar 25 September 1929 E. Hertzsprung Johannesburg Obs.(Leiden Southern Station) (1627) Ivar 1929 SH1957 NA1957 XA Ivar Hertzsprung(discoverer's brother) NEOAmor 4 September 2017 (JD 2458000.5) 0 87.62 yr (32,002 days) 2.6015 AU 1.1240 AU 2023-Sep-09 1.8628 AU 0.3966 2.54 yr (929 days) 229.02° 0.3877 ms / day 8.4513° 133.14° 167.76° 0.1117 AU43.5 LD ≈15×6×6 km8.370 0.075 km9.12 km9.9 2.8 km10.2 km 4.795 h4.795 0.002 h4.795170 h 4.79517 0.00005 h 4.7954 0.006 h4.796 h4.7961 0.0001 h4.797 h4.798 h4.80 h 0.09 0.120.1170.128 0.1230.134 0.0250.150.151 (taken) S (Tholen)S (SMASS)SrwSB–V = 0.872U–B = 0.459 12.87 0.112.8712.9012.99 0.2513.0013.1713.213.22 0.2313.24 1627 Ivar (provisional designation 1929 SH) is an elongated stony asteroid and near-Earth object of the Amor group, approximately 15×6×6 km.Crowell Jenna L. Howell Ellen S. Ellen Howell Magri Christopher Nolan Michael C. Fernández Yanga R. Richardson James E. Warner Brian D. Marshall Sean E. Springmann Alessondra July 2017 Radar and Lightcurve Shape Model of Near-Earth Asteroid (1627) Ivar Icarus 291 254–267 10.1016/j.icarus.2016.11.008 0019-1035 2017Icar..291..254C It was discovered on 25 September 1929, by Danish astronomer Ejnar Hertzsprung at Leiden Southern Station, annex to the Johannesburg Observatory in South Africa. It was named after Ivar Hertzsprung, brother of the discoverer. 1627 Ivar was the first asteroid to be imaged by radar, in July 1985 by the Arecibo Observatory.To See the Unseen, A History of Planetary Radar Astronomy - chapter 9, Andrew J. Butrica, The NASA History Series Classification and orbit Ivar orbits the Sun at a distance of 1.1–2.6 AU once every 2 years and 6 months (929 days). Its orbit has an eccentricity of 0.40 and an inclination of 8° with respect to the ecliptic. Ivar's observation arc begins with its official discovery observation in 1929, as no precoveries were taken, and no prior identifications were made. It has an Earth minimum orbit intersection distance of 0.1117 AU km on off 3 which corresponds to 43.5 lunar distances. The eccentric Amor asteroid is also a Mars-crosser. In August 2074, it will pass Earth at 0.141 AU, closer than it actually approached Mars in July 1975 (0.150 AU). Physical characteristics In the SMASS and Tholen taxonomic scheme, Ivar is characterized as a common stony S-type asteroid. Rotation period A large number of rotational lightcurves of Ivar have been obtained from photometric observations since 1985 (see infobox). They give a well-defined rotation period between 4.795 and 4.80 hours with a brightness variation between 0.27 and 1.40 magnitude, indicative of its non-spheroidal shape (also see 3D-model image).Skiff Brian A. Bowell Edward Koehn Bruce W. Sanborn Jason J. McLelland Kyle P. Warner Brian D. July 2012 Lowell Observatory Near-Earth Asteroid Photometric Survey (NEAPS) - 2008 May through 2008 December Minor Planet Bulletin en 39 3 111 1052-8091 2012MPBu...39..111S New radar and visual observations refined the period to 4.7951689 ± 0.0000026 hours. Future photometric observations will show whether the YORP effect will slowly change the body's spin rate (as seen with 1862 Apollo). In 1985, the body was observed with radar from the Arecibo Observatory in Puerto Rico at a distance of 0.20 AU. The measured radar cross-section was 7.5 square kilometers. It was the first asteroid to be imaged by radar. Radar observations have been performed again in June & July 2013 and July 2018. Diameter and albedo According to the EXPLORENEOs survey carried out by the Spitzer Space Telescope, thermal infrared observations by the Keck Observatory, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, and thermal modeling by Alan Harris, Ivar measures between 8.37 and 10.2 kilometers in diameter, and it surface has an albedo between 0.09 and 0.15. The Collaborative Asteroid Lightcurve Link adopts an albedo of 0.151 and a diameter of 9.12 kilometers with an absolute magnitude of 12.87. According to model based on radar and photometric observations Ivar is an elongated asteroid with maximum extensions along the three body-fixed coordinates being 15.15 × 6.25 × 5.66 km ± 10%. Naming This minor planet was named by the discoverer in honor of his late brother Ivar Hertzsprung. The official 1627 naming citation was published by the Minor Planet Center in February 1959 (M.P.C. 1860). References JPL Small-Body Database Browser: 1627 Ivar (1929 SH) https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=Ivar&view=OPC Jet Propulsion Laboratory 4 June 2017 Dictionary of Minor Planet Names – (1627) Ivar Schmadel Lutz D. Springer Berlin Heidelberg 129 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1628 (1627) Ivar 1627 Ivar (1929 SH) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1627 28 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 6 S. J. Ostro D. B. Campbell J. F. Chandler I. I. Shapiro A. A. Hine R. Velez R. F. Jurgens K. D. Rosema R. Winkler D. K. Yeomans October 1991 Asteroid radar astrometry Astronomical Journal 102 1490–1502.ResearchsupportedbyNASA 0004-6256 1991AJ....102.1490O 10.1086/115975 1627 28 December 2016 Harris, Alan W. February 1998 A Thermal Model for Near-Earth Asteroids Icarus 131 2 291–301 1998Icar..131..291H 10.1006/icar.1997.5865 Marco Delbó Alan W. Harris Richard P. Binzel Petr Pravec John K. Davies November 2003 Keck observations of near-Earth asteroids in the thermal infrared Icarus 166 1 116–130 2003Icar..166..116D 10.1016/j.icarus.2003.07.002 6 Michael Mueller M. Delbo' J. L. Hora D. E. Trilling B. Bhattacharya W. F. Bottke S. Chesley J. P. Emery G. Fazio A. W. Harris A. Mainzer M. Mommert B. Penprase H. A. Smith T. B. Spahr J. A. Stansberry C. A. Thomas April 2011 ExploreNEOs. III. Physical Characterization of 65 Potential Spacecraft Target Asteroids The Astronomical Journal 141 4 9 2011AJ....141..109M 10.1088/0004-6256/141/4/109 44827674 https://authors.library.caltech.edu/23152/1/Mueller2011p13239Astron_J.pdf 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 A. W. Harris J. W. Young June 1985 Photometric Results for Earth Approaching Asteroids. Bulletin of the American Astronomical Society 17 726 1985BAAS...17R.726H D. F. Lupishko F. P. Velichko V. G. Shevchenko October 1986 The asteroid 1627 Ivar – UBV photometry, period, and sense of rotation Kinematika I Fizika Nebesnykh Tel 2 39–43 0233-7665 1986KFNT....2...39L 6 G. Hahn P. Magnusson A. W. Harris J. W. Young L. A. Belkora N. J. Fico D. F. Lupishko V. G. Shevchenko F. P. Velichko R. Burchi G. Ciunci M. di Martino H. Debehogne April 1989 Physical studies of Apollo-Amor asteroids – UBVRI photometry of 1036 Ganymed and 1627 Ivar Icarus 78 2 363–381 0019-1035 1989Icar...78..363H 10.1016/0019-1035(89)90184-X Petr Pravec Lenka Sarounová Marek Wolf December 1996 Lightcurves of 7 Near-Earth Asteroids Icarus 124 2 471–482 1996Icar..124..471P 10.1006/icar.1996.0223 L. L. Kiss Gy. Szabó K. Sárneczky November 1999 CCD photometry and new models of 5 minor planets Astronomy and Astrophysics Supplement 140 21–28 1999A&AS..140...21K 10.1051/aas:1999115 astro-ph/9909159 16733071 Gyula Szabo Laszlo L. Kiss February 2001 CCD photometric investigations of small bodies in the solar system http://astro.elte.hu/phd2000/szabogy.pdf https://web.archive.org/web/20031026032739/http://astro.elte.hu/phd2000/szabogy.pdf dead 2003-10-26 Publications of the Astronomy Department of the Eötvös University 11 11 119 2001PADEU..11..119S 28 December 2016 6 Mikko Kaasalainen Petr Pravec Yurij N. Krugly Lenka Sarounová Johanna Torppa Jenni Virtanen Sanna Kaasalainen Anders Erikson Andreas Nathues Josef Durech Marek Wolf Johan S. V. Lagerros Mats Lindgren Claes-Ingvar Lagerkvist Robert Koff John Davies Rita Mann Peter Kusnirák Ninel M. Gaftonyuk Vasilij G. Shevchenko Vasilij G. Chiorny Irina N. Belskaya January 2004 Photometry and models of eight near-Earth asteroids Icarus 167 1 178–196 2004Icar..167..178K 10.1016/j.icarus.2003.09.012 Brian A. Skiff Edward Bowell Bruce W. Koehn Jason J. Sanborn Kyle P. McLelland Brian D. Warner July 2012 Lowell Observatory Near-Earth Asteroid Photometric Survey (NEAPS) – 2008 May through 2008 December The Minor Planet Bulletin 39 3 111–130 1052-8091 2012MPBu...39..111S Warner, Brian D. January 2014 Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2013 June–September The Minor Planet Bulletin 41 1 41–47 32457957 7249616 1052-8091 2014MPBu...41...41W Warner, Brian D. July 2015 Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2015 January – March The Minor Planet Bulletin 42 3 172–183 32455355 7244166 1052-8091 2015MPBu...42..172W J. Hanus M. Delbo' J. Durech V. Alí-Lagoa August 2015 Thermophysical modeling of asteroids from WISE thermal infrared data – Significance of the shape model and the pole orientation uncertainties Icarus 256 101–116 2015Icar..256..101H 10.1016/j.icarus.2015.04.014 1504.04199 118480799 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 Icarus 261 34–47 2015Icar..261...34V 10.1016/j.icarus.2015.08.007 1506.00762 53493339 B. Carry E. Solano S. Eggl F. E. DeMeo April 2016 Spectral properties of near-Earth and Mars-crossing asteroids using Sloan photometry Icarus 268 340–354 2016Icar..268..340C 10.1016/j.icarus.2015.12.047 1601.02087 119258489 6 A. Mainzer T. Grav J. Masiero J. Bauer E. Wright R. M. Cutri R. S. McMillan M. Cohen M. Ressler P. Eisenhardt August 2011 Thermal Model Calibration for Minor Planets Observed with Wide-field Infrared Survey Explorer/NEOWISE The Astrophysical Journal 736 2 9 2011ApJ...736..100M 10.1088/0004-637X/736/2/100 50794389 6 C. A. Thomas D. E. Trilling J. P. Emery M. Mueller J. L. Hora L. A. M. Benner B. Bhattacharya W. F. Bottke S. Chesley M. Delbó G. Fazio A. W. Harris A. Mainzer M. Mommert A. Morbidelli B. Penprase H. A. Smith T. B. Spahr J. A. Stansberry September 2011 ExploreNEOs. V. Average Albedo by Taxonomic Complex in the Near-Earth Asteroid Population The Astronomical Journal 142 3 12 2011AJ....142...85T 10.1088/0004-6256/142/3/85 free Cristina A. Thomas Joshua P. Emery David E. Trilling Marco Delbó Joseph L. Hora Michael Mueller January 2014 Physical characterization of Warm Spitzer-observed near-Earth objects Icarus 228 217–246 2014Icar..228..217T 10.1016/j.icarus.2013.10.004 1310.2000 119278697 External links NeoDys entry on Ivar 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 1627 1627 Ivar 1626 Sadeya 1627 1628 Strobel 001627 Category:Discoveries by Ejnar Hertzsprung Category:Named minor planets 001627 001627 001627 19290925