1362 Griqua

Main-belt asteroid May 2018 yes 1362 Griqua #D6D6D6 31 July 1935 C. Jackson Johannesburg Obs. (1362) Griqua 1935 QG 11931 BN ' g r i: k w @ Griqua people(South African tribe) main-belt(outer)GriquabackgroundACO 23 March 2018 (JD 2458200.5) 0 87.03 yr (31,788 d) 4.4123 AU 2.0213 AU 3.2168 AU 0.3716 5.77 yr (2,107 d) 16.650° 0.1708 ms / day 24.223° 121.34° 261.82° 2.9490 25.60 3.72 km26.936 0.363 km28.36 0.40 km29.90 1.5 km29.9 3.0 km30 3 km31.0 km (radiometric) 6.891 0.0297 h6.9 0.1 h6.907 0.003 h7 h (poor) 0.055 (radiometric)0.0667 0.0070.07 0.010.075 0.0020.082 0.0130.091 0.042 Tholen CPB (S3OS2)U–B 0.360B–V 0.720 11.1811.18 0.1011.561 0.003 (S) 1362 Griqua, provisional designation 1935 QG 1 is a dark, Jupiter-resonant background asteroid on an eccentric, cometary-like orbit and the namesake of the Griqua group, located in the Hecuba gap in the outermost region of the asteroid belt. The carbonaceous asteroid measures approximately 28 km mi off 2 us in diameter and has a rotation period of 6.9 hours. It was discovered on 31 July 1935, by South-African astronomer Cyril Jackson at Union Observatory in Johannesburg. The asteroid was named after the Griqua people in South Africa and Namibia. Orbit and classification Griqua is an asteroid in a cometary orbit (ACO), with no observable coma but with a Tisserand's parameter of 2.95, below the threshold of 3.0 defined for main-belt asteroids. ACO's may be extinct comets. It is the namesake and largest member of the small dynamical Griqua group (known as the "Griquas"), a marginally unstable group of asteroids observed in the Hecuba gap, a resonant zone with the gas giant Jupiter (2/1J). Griqua itself is background asteroids and does not belong to any known asteroid family. This asteroid orbits the Sun in the outermost asteroid belt at a distance of 2.0–4.4 AU once every 5 years and 9 months (2,107 days; semi-major axis of 3.22 AU). Its orbit has a high eccentricity of 0.37 and an inclination of 24° with respect to the ecliptic. The body's observation arc begins with its first observation as 1931 BN at Lowell Observatory in January 1931, more than 4 years prior to its official discovery observation at Johannesburg. Groups in the Hecuba gap The marginally unstable Griqua group includes 3688 Navajo, 4177 Kohman and 11665 Dirichlet, while the stable 2:1 resonant group are the "Zhongguos", named after 3789 Zhongguo. The transition between these two groups, however, is not clear. The unnamed, third group in the Hecuba gap are strongly unstable. Their largest members are the asteroids 1921 Pala, 1922 Zulu and 5201 Ferraz-Mello, as well as 5370 Taranis, 8373 Stephengould, and 9767 Midsomer Norton.422,423 Physical characteristics In the Tholen classification, Griqua spectral type is ambiguous, closest to a common C-type asteroid and somewhat similar to a primitive P-type asteroid (CP). The asteroid has also been characterized as a "brighter" B-type asteroid in both the Tholen- and SMASS-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2). Rotation period In November 2000, a rotational lightcurve of Griqua was obtained from photometric observations by Colin Bembrick at the Mount Tarana Observatory in Australia. Lightcurve analysis gave a well-defined rotation period of 6.907 hours with a brightness variation of 0.25 magnitude (U=3). In 2009, follow-up observations by Jean and Milan Strajnic 511, Alain Klotz and Raoul Behrend as well as observations in the S-band by astronomers at the Palomar Transient Factory in California gave a concurring period of 6.891 and 6.9 hours with an amplitude of 0.23 and 0.24 magnitude, respectively (U=2/2). The result supersedes a measurement of 7 hours made in the 1970s (U=1). Diameter and albedo According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Griqua measures between 25.60 and 30 kilometers in diameter and its surface has an albedo between 0.0667 and 0.091. The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0667 with a diameter of 29.90 kilometers based on an absolute magnitude of 11.18, while fragmentary radiometric observations in the 1970s determined a diameter of 31.0 kilometer and a derived albedo of 0.055 (TRIAD).TRIAD Naming This minor planet is named after the Afrikaans-speaking Griqua people, a mixed tribe of Bushman and Khoikhoi descent in Griqualand in South Africa and Namibia. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 24). Notes TRIAD The TRIAD radiometric diameters and albedos (Tucson Revised Index of Asteroid Data). The radiometric observations used for the Tucson Revised Index of Asteroid Data (TRIAD) compilation consist of broadband radiometry at 10 microns (the N band) and 20 microns (the Q band). Observations from 1972 through 1978 have been used. The results are compiled in Morrison and Zellner (1979). References to the observation papers for each entry are given in the associated references file. The observations have been interpreted with the standard model described in Morrison and Lebofsky (1979), using the computer code of Jones and Morrison (1974). Further details of the analysis are described in Morrison and Lebofsky (1979). References 2018-01-27 last obs. JPL Small-Body Database Browser: 1362 Griqua (1935 QG1) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001362 Jet Propulsion Laboratory 16 May 2018 Dictionary of Minor Planet Names – (1362) Griqua Schmadel Lutz D. Springer Berlin Heidelberg 110 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1363 (1362) Griqua 1362 Griqua (1935 QG1) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1362 16 May 2018 F. Roig D. Nesvorný S. Ferraz-Mello September 2002 Asteroids in the 2 : 1 resonance with Jupiter: dynamics and size distribution https://www.boulder.swri.edu/~davidn/papers/zhongguos1.pdf Monthly Notices of the Royal Astronomical Society 335 2 417–431 2002MNRAS.335..417R 10.1046/j.1365-8711.2002.05635.x free 16 May 2018 Asteroids and comets rotation curves – (1362) Griqua Behrend Raoul Geneva Observatory http://obswww.unige.ch/~behrend/page4cou.html#001362 16 May 2018 3 August 2003 https://web.archive.org/web/20030803183423/http://obswww.unige.ch/~behrend/page4cou.html#001362 dead 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 The Astrophysical Journal 741 2 20 2011ApJ...741...68M 10.1088/0004-637X/741/2/68 1109.4096 118745497 D. Lazzaro C. A. Angeli J. M. Carvano T. Mothé-Diniz R. Duffard M. Florczak November 2004 S3OS2: the visible spectroscopic survey of 820 asteroids http://sirrah.troja.mff.cuni.cz/yarko-site/tmp/eos/NEW/spectral_type_figure/s3os2.pdf Icarus 172 1 179–220 2004Icar..172..179L 10.1016/j.icarus.2004.06.006 16 May 2018 Asteroid 1362 Griqua Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1362%20Griqua 16 May 2018 https://web.archive.org/web/20180517082031/https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1362%20Griqua 17 May 2018 dead 1362 16 May 2018 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 12 IRAS-A-FPA-3-RDR-IMPS-V6.0 2004PDSS...12.....T 22 October 2019 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 The Astrophysical Journal Letters 759 1 5 2012ApJ...759L...8M 10.1088/2041-8205/759/1/L8 1209.5794 46350317 6 V. Alí-Lagoa J. de León J. Licandro M. Delbó H. Campins N. Pinilla-Alonso M. S. Kelley June 2013 Physical properties of B-type asteroids from WISE data Astronomy and Astrophysics 554 16 2013A&A...554A..71A 10.1051/0004-6361/201220680 1303.5487 119214002 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 (catalog) 6 V. Alí-Lagoa J. Licandro R. Gil-Hutton Cañ M. ada-Assandri M. Delbo' J. de León H. Campins N. Pinilla-Alonso M. S. P. Kelley J. Hanus June 2016 Differences between the Pallas collisional family and similarly sized B-type asteroids Astronomy and Astrophysics 591 11 2016A&A...591A..14A 10.1051/0004-6361/201527660 free 11336/63614 free 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) J. Licandro A. Alvarez-Candal J. de León N. Pinilla-Alonso D. Lazzaro H. Campins April 2008 Spectral properties of asteroids in cometary orbits http://www.iac.es/proyecto/pcssolar/media/acos/Licandro_AA_2008.pdf Astronomy and Astrophysics 481 3 861–877 2008A&A...481..861L 10.1051/0004-6361:20078340 16 May 2018 free October 2026 InternetArchiveBot Bembrick, C. September 2001 Lightcurves and Period Determination for 1362 Griqua The Minor Planet Bulletin 28 42–43 2001MPBu...28...42B R. C. Taylor T. Gehrels R. C. Capen September 1976 Minor planets and related objects. XXI - Photometry of eight asteroids Astronomical Journal 81 778–786.NASA–supportedresearch 1976AJ.....81..778T 10.1086/111953 6 Adam Waszczak Chan-Kao Chang Eran O. Ofek Russ Laher Frank Masci David Levitan Jason Surace Yu-Chi Cheng Wing-Huen Ip Daisuke Kinoshita George Helou Thomas A. Prince Shrinivas Kulkarni September 2015 Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry The Astronomical Journal 150 3 35 2015AJ....150...75W 10.1088/0004-6256/150/3/75 1504.04041 8342929 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 External links Asteroids in Cometary Orbits (ACOs), Instituto de Astrofísica de Canarias 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 1362 1361 Leuschneria 1362 1363 Herberta 001362 001362 Category:Discoveries by Cyril Jackson (astronomer) Category:Named minor planets 001362 19350731