1831 Nicholson

Stony main-belt asteroid December 2018 yes 1831 Nicholson #D6D6D6 P. Wild Zimmerwald Obs. 17 April 1968 (1831) Nicholson 1968 HC1948 GF1955 ML Seth B. Nicholson(American astronomer) main-belt(inner)BaptistinaFlora 27 April 2019 (JD 2458600.5) 0 62.92 yr (22,982 d) 2.5257 AU 1.9527 AU 2.2392 AU 0.1279 3.35 yr (1,224 d) 36.790° 0.2941 ms / day 5.6335° 72.604° 183.46° 7.10 1.29 km8.08 0.47 km 3.228 0.001 h 0.2960.39 SMASS S 12.4012.512.70 1831 Nicholson, provisional designation 1968 HC, is a stony asteroid of the Baptistina family from the inner regions of the asteroid belt, approximately 8 km mi off 1 us in diameter. It was discovered on 17 April 1968, by Swiss astronomer Paul Wild at the Zimmerwald Observatory near Bern, Switzerland. The S-type asteroid has a rotation period of 3.2 hours. It was named for American astronomer Seth B. Nicholson. Orbit and classification According to a HCM-analysis by David Nesvorný, Nicholson is a member of the Baptistina family (403), located within the greater Flora family a giant asteroid clan and the largest family of stony asteroids in the asteroid belt. Conversely, and since the existence of a proper Flora family has been ruled out by other astronomers, Nicholson has also been classified as a background asteroid. It orbits the Sun in the inner main-belt at a distance of 2.0–2.5 AU once every 3 years and 4 months (1,224 days; semi-major axis of 2.24 AU). Its orbit has an eccentricity of 0.13 and an inclination of 6° with respect to the ecliptic. The asteroid was first observed as 1948 GF at the Nice Observatory in April 1948. The body's observation arc begins with its observation as 1955 ML at the Goethe Link Observatory in June 1955, almost 13 years prior to its official discovery observation at Zimmerwald. Physical characteristics In the SMASS classification, Nicholson is a common stony S-type asteroid. Rotation period In April 2015, a rotational lightcurve of Nicholson was obtained from photometric observations by a group of Spanish astronomers from Valencia and Alicante at various observatories: J08, Z95, J67, Z98 and I57. Lightcurve analysis gave a well-defined rotation period of 3.228 0.001 hours and a brightness variation of 0.24 magnitude (U=3). At the same time, Serbian astronomer Vladimir Benishek at the Belgrade Observatory determined a concurring period of 3.25510 0.00003 hours with an amplitude of 0.29 magnitude (U=3). Diameter and albedo According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Nicholson measures 7.1 or 8.1 kilometers in diameter and its surface has an albedo of 0.39 and 0.296, respectively. The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the namesake of the Flora family – and calculates a diameter of 8.58 kilometers based on an absolute magnitude of 12.5. Naming This minor planet was named by the discoverer in memory of American astronomer Seth B. Nicholson (1891–1963), who pioneered in several branches of planetary research at Mount Wilson Observatory and who discovered four of Jupiter's numerous moons – namely, Sinope, Lysithea, Carme, and Ananke. The lunar crater Nicholson and the dark terrain of Nicholson Regio on Jupiter's moon Ganymede, as well as the impact crater Nicholson on Mars have also been named after him. The official 1831 naming citation was published by the Minor Planet Center on 15 October 1977 (M.P.C. 4236). References 30em 2018-05-25 last obs. JPL Small-Body Database Browser: 1831 Nicholson (1968 HC) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001831 Jet Propulsion Laboratory 7 December 2018 Schmadel Lutz D. Dictionary of Minor Planet Names Springer Berlin Heidelberg 147 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1832 (1831) Nicholson 1831 Nicholson (1968 HC) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1831 7 December 2018 Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008) Appendix – Publication Dates of the MPCs Schmadel Lutz D. 2009 Springer Berlin Heidelberg 221 978-3-642-01964-7 10.1007/978-3-642-01965-4 Asteroid (1831) Nicholson – Proper elements AstDyS-2, Asteroids – Dynamic Site https://newton.spacedys.com/astdys/index.php?n=1831&pc=1.1.6 20 October 2019 Asteroid 1831 Nicholson Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1831+Nicholson 7 December 2018 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 1831 7 December 2018 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 6 A. K. Mainzer J. M. Bauer R. M. Cutri T. Grav E. A. Kramer J. R. Masiero C. R. Nugent S. M. Sonnett R. A. Stevenson E. L. Wright June 2016 NEOWISE Diameters and Albedos V1.0 https://sbnarchive.psi.edu/pds3/non_mission/EAR_A_COMPIL_5_NEOWISEDIAM_V1_0/data/neowise_mainbelt.tab NASA Planetary Data System EAR-A-COMPIL-5-NEOWISEDIAM-V1.0 2016PDSS..247.....M 7 December 2018 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 Garcerà Alfonso Carreñ n o Amadeo Aznar Macias Enrique Arce Mansego Pedro Brines Rodriguez Juan Lozano de Haro October 2015 Lightcurve Analysis of Six Asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015MPBu...42..235G The Minor Planet Bulletin 42 4 235–237 1052-8091 2015MPBu...42..235G 7 December 2018 Benishek, Vladimir January 2016 Rotation Periods of 1831 Nicholson, 2929 Harris, 8463 Naomimurdoch, and (34173) 2000 QY37 http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016MPBu...43...89B The Minor Planet Bulletin 43 1 89–90 1052-8091 2016MPBu...43...89B 7 December 2018 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 Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 1831 1830 Pogson 1831 1832 Mrkos 001831 Category:Discoveries by Paul Wild (Swiss astronomer) Category:Named minor planets 001831 19680417