1484 Postrema

Main-belt carbonaceous asteroid October 2019 yes 1484 Postrema #D6D6D6 001484-asteroid shape model (1484) Postrema.png Shape model of Postrema from its lightcurve G. Neujmin Simeiz Obs. 29 April 1938 (1484) Postrema 1938 HC1933 DHA911 KC p Q ' s t r iː m @ postrēma("the last of a group") main-belt(middle)Postrema Postremian 4 September 2017 (JD 2458000.5) 0 84.61 yr (30,903 days) 3.2973 AU 2.1816 AU 2.7394 AU 0.2036 4.53 yr (1,656 days) 194.22° 0.2174 ms / day 17.300° 72.767° 126.82° 34.696 1.954 km38.82 6.78 km40.871 0.279 km41 4 km41.1 8.2 km41.73 12.60 km43.18 1.0 km43.42 km (derived)47.00 0.62 km 12.18978 0.00001 h12.19 0.02 h12.1923 0.0005 h 0.0137 0.0010.015 0.0090.035 0.0010.0367 0.00740.0409 (derived)0.05 0.010.05 0.020.05 0.04 SMASS B 10.8010.8810.9012.10 1484 Postrema, provisional designation 1938 HC, is a carbonaceous Postremian asteroid and namesake of the Postrema family from the central regions of the asteroid belt, approximately 41 kilometers in diameter. It was discovered on 29 April 1938, by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula. The name "Postrema" celebrates the astronomer's last minor planet discovery. Orbit and classification Postrema is the parent body and namesake of the Postrema family (541), a mid-sized central asteroid family of little more than 100 members.23 It orbits the Sun in the central main-belt at a distance of 2.2–3.3 AU once every 4 years and 6 months (1,656 days). Its orbit has an eccentricity of 0.20 and an inclination of 17° with respect to the ecliptic. The asteroid was first identified as A911 KC at Johannesburg Observatory in May 1911. The body's observation arc begins with its identification as 1933 DH at Lowell Observatory in February 1933, more than 5 years prior to its official discovery observation at Simeiz. Physical characteristics Spectral type In the SMASS classification, Postrema is a bright carbonaceous B-type asteroid, while the overall spectral type of the Postrema family has been described as that of C- and X-type.23 Rotation period In May 2006, two rotational lightcurves of Postrema were independently obtained from photometric observations. Lightcurve analysis gave a rotation period of 12.19 and 12.1923 hours with a brightness amplitude of 0.23 and 0.22 magnitude, respectively (U=2+/3-). Spin axis The asteroids lightcurve has also been modeled, using photometric data from the Lowell Photometric Database and other sources. Modelling gave a concurring period of 12.18978 hours, as well as two spin axis of (19.0°, 44°) and (250.0°, 64°) in ecliptic coordinates (λ, β). 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, Postrema measures between 34.696 and 47.00 kilometers in diameter and its surface has a notably low albedo between 0.0137 and 0.05. The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0409 and a diameter of 43.42 kilometers based on an absolute magnitude of 10.9. Naming This minor planet was named "Postrema", which means "the last of a group". It celebrates Grigory Neujmin's last numbered minor planet discovery. The official 1484 naming citation was published by the Minor Planet Center in June 1955 (M.P.C. 1252). The citation only holds true at the time of publication. In retrospect, Postrema is not Neujmin's last discovery, neither by number nor by its discovery date. These would be the asteroids 4420 Alandreev (highest numbered) and 2536 Kozyrev, officially discovered on 15 August 1939, more than a year after Postrema. References 30em 2017-09-28 last obs. JPL Small-Body Database Browser: 1484 Postrema (1938 HC) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001484 Jet Propulsion Laboratory 19 October 2017 Dictionary of Minor Planet Names https://archive.org/details/dictionaryminorp00schm limited (1484) Postrema Schmadel Lutz D. Springer Berlin Heidelberg 118 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1485 1484 Postrema (1938 HC) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1484 19 October 2017 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 Asteroids and comets rotation curves – (1484) Postrema Behrend Raoul Geneva Observatory http://obswww.unige.ch/~behrend/page4cou.html#001484 19 October 2017 3 August 2003 https://web.archive.org/web/20030803183423/http://obswww.unige.ch/~behrend/page4cou.html#001484 dead 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 19 October 2017 Asteroid 1484 Postrema – Nesvorny HCM Asteroid Families V3.0 Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1484+Postrema#Asteroid%201484%20PostremaEAR-A-VARGBDET-5-NESVORNYFAM-V3.0 26 October 2019 October 2026 InternetArchiveBot D. Nesvorný M. Broz V. Carruba December 2014 Identification and Dynamical Properties of Asteroid Families Asteroids IV 297–321 2015aste.book..297N 10.2458/azu_uapress_9780816532131-ch016 1502.01628 9780816532131 1484 19 October 2017 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 http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013A&A...554A..71A Astronomy and Astrophysics 554 16 2013A&A...554A..71A 10.1051/0004-6361/201220680 1303.5487 19 October 2017 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 19 October 2017 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 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 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) 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 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 Julian, William M., II December 2006 Period determination for 1484 Postrema http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2006MPBu...33..103J The Minor Planet Bulletin 33 4 103–104 1052-8091 2006MPBu...33..103J 19 October 2017 J. Durech J. Hanus D. Oszkiewicz R. Vanco March 2016 Asteroid models from the Lowell photometric database http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016A&A...587A..48D Astronomy and Astrophysics 587 6 2016A&A...587A..48D 10.1051/0004-6361/201527573 1601.02909 19 October 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 1484 1483 Hakoila 1484 1485 Isa 001484 Category:Discoveries by Grigory Neujmin Category:Named minor planets 001484 19380429