(9942) 1989 TM1

Asteroid September 2018 yes (9942) 1989 TM 1 #D6D6D6 T. HiokiN. Kawasato Okutama Obs. 8 October 1989 (9942) 1989 TM 1 main-belt(middle)background 4 September 2017 (JD 2458000.5) 0 26.64 yr (9,732 days) 3.0287 AU 2.1619 AU 2.5953 AU 0.1670 4.18 yr (1,527 days) 217.94° 0.2357 ms / day 9.9393° 21.747° 38.492° 4.12 0.45 km4.73 km (calculated) 3.0706 0.0004 h 0.20 (assumed)0.454 0.106 S (assumed) 13.4013.54113.613.99 (9942) 1989 TM 1 is a background asteroid from the central region of the asteroid belt, approximately 4.5 km mi off us in diameter. It was discovered on 8 October 1989, by Japanese astronomers Nobuhiro Kawasato and Tsutomu Hioki at the Okutama Observatory 877 in Japan. The asteroid has a tentative rotation period of 3.1 hours. Orbit and classification thumb|left|200px|Orbits of 1989 TM 1 (blue) and the inner planets and Jupiter The assumed stony S-type is a non-family asteroid from the main belt's background population. It orbits the Sun in the central main-belt at a distance of 2.2–3.0 AU once every 4 years and 2 months (1,527 days; semi-major axis of 2.6 AU). Its orbit has an eccentricity of 0.17 and an inclination of 10° with respect to the ecliptic. Its first observation was a precovery taken at the Palomar Observatory on 30 September 1989, extending the asteroid's observation arc by just 9 days prior to its official discovery observation. Numbering and naming This minor planet was numbered by the Minor Planet Center on 2 February 1999. As of 2018, it has not been named. Physical characteristics Diameter and albedo The asteroid was predicted to cross the focal plane array of the Infrared Astronomical Satellite (IRAS). However, it was missed on each of its seven planned observation and was never detected. According to the "missed predictions file" of the supplemental IRAS minor planet survey (SIMPS), the body was expected to have a diameter of 13.5 kilometers and an absolute magnitude of 13.20. Based on an absolute magnitude of 13.99, and an assumed standard albedo for stony asteroids of 0.20, the Collaborative Asteroid Lightcurve Link calculated a much smaller diameter of 4.7 kilometers, which agrees with a diameter of 4.1 kilometers, found by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission. Rotation period In October 2010, a rotational lightcurve for this asteroid was obtained from photometric observations at the Palomar Transient Factory in California. It rendered a tentative rotation period of 3.0706 0.0004 hours with a brightness variation of 0.08 in magnitude (U=1). References 30em Tedesco E.F. Noah P.V. Noah M. Price S.D. The supplemental IRAS minor planet survey (SIMPS) – Missed-Predictions http://iopscience.iop.org/1538-3881/123/2/1056/fulltext/FP206.txt 1 January 2016 2018-05-19 last obs. JPL Small-Body Database Browser: 9942 (1989 TM1) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2009942 Jet Propulsion Laboratory 13 September 2018 9942 (1989 TM1) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=9942 13 September 2018 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 13 September 2018 9942 4 July 2016 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 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 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 (5001)-(10000) – Minor Planet Center 9942 9941 Iguanodon 9942 (9942) 1989 TM 1 (9943) 1989 UG3 009942 Category:Discoveries by Tsutomu Hioki Category:Discoveries by Nobuhiro Kawasato 19891008