167P/CINEOS

Chiron-type comet August 2021 167P/CINEOS IAUC_8545 CINEOS August 10, 2004 P/2004 PY 42 jpldata MPC November 21, 2025 (JD 2461000.5) 9.35 yearsobs_arc June 12, 2002 99 11.894 AU 20.598 AU 16.246 AU 0.26787 65.483 years 19.073° 9.8 km/sHorizons2066 5.6 km/smin_orb_vel 295.84° 344.33° 135.64° 3.527 10.771 AU 6.604 AU jpldata 66.17 ± 22.9 km miBauer_2013 0.053 0.019Bauer_2013 (B–V) 0.80 0.04Jewitt_2015 (V–R) 0.57 0.03Jewitt_2015 (R–I) 0.45 0.03Jewitt_2015 (B–R) 1.29 0.03Tegler_2016 9.7 April 24, 2001 March 18, 2066Horizons2066 March 23, 2066NK1185 167P/CINEOS, also known as P/2004 PY 42, is a large periodic comet and active, grey centaur, approximately 66 km mi off 2 us in diameter, orbiting the Sun outside the orbit of Saturn. It was discovered on August 10, 2004, by astronomers with the CINEOS survey at Gran Sasso in Italy. It is one of only a handful known Chiron-type comets. The comet nucleus (~66 km) is roughly half the size of C/2014 UN 271 (Bernardinelli–Bernstein) and it has a similar perihelion point just outside the orbit of Saturn. +Large comets with perihelion near Saturn's orbit at 10 AU Comet Nucleusdiameter Perihelion(Sun approach) Perihelionvelocity95P/Chiron 215 km 8.5 AU 12.0 km/sC/2014 UN271 (Bernardinelli–Bernstein) 120 km 10.95 AU 12.7 km/s167P/CINEOS 66 km 11.77 AU 9.8 km/sHorizons2066 Observational history Due to its high Jupiter tisserand of 3.5, and a semi-major axis larger than that of Jupiter, 167P/CINEOS is classified as a Chiron-type comet, named after the groups namesake, 2060 Chiron or 95P/Chiron, designated as both minor planet and comet.jpldata 167P/CINEOS was first reported as a minor planet, designated 2004 PY 42, but was found to have a very faint asymmetric cometary coma.IAUC_8545 Contrary to Chiron, which is the prototype object for the dynamical group of centaurs, 167P/CINEOS has no "dual status" as comet and minor planet, and demonstrates the inconsistencies in applying the current rules for designating small Solar System bodies.IAUC_8552 167P/CINEOS not only has orbital parameters similar to those of Chiron, but also a low B–R magnitude of 1.29 0.03, which places it into the group grey centaurs.Tegler_2016 In June 2039, 167P/CINEOS will pass 1.64 AU from Uranus.jpldata Notes "min_orb_vel" Minimum orbital speed attained at its next aphelion on November 30, 2033. "obs_arc" Observation arc from the Minor Planet Center database covering dates from June 12, 2002 until October 19, 2011. References J. M. Bauer T. Grav E. Blauvelt etal Centaurs and Scattered Disk Objects in the Thermal Infrared: Analysis of WISE/NEOWISE Observations The Astrophysical Journal 2013 773 1 22–33 2013ApJ...773...22B 1306.1862 10.1088/0004-637X/773/1/22 free W. Romanishin S. C. Tegler A. Boattini F. de Luise A. di Paola D. W. Green Comet C/2004 PY 42 (CINEOS) http://www.cbat.eps.harvard.edu/iauc/08500/08545.html IAU Circular 2005-06-17 8545 1 2005IAUC.8545....1R 0081-0304 D. W. Green Comets 165P/2000 B4, 166P/2001 T4, and 167P/2004 PY 42 http://www.cbat.eps.harvard.edu/iauc/08500/08552.html IAU Circular 2005-06-27 8552 2 2005IAUC.8552....2G 0081-0304 D. C. Jewitt Color Systematics of Comets and Related Bodies The Astronomical Journal 2015 150 6 201–219 2015AJ....150..201J 1510.07069 10.1088/0004-6256/150/6/201 free 167P/CINEOS – JPL Small-Body Database Lookup https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=167P ssd.jpl.nasa.gov Jet Propulsion Laboratory 2012-07-12 167P/CINEOS Orbit http://www.minorplanetcenter.net/db_search/show_object?object_id=167P Minor Planet Center 2014-06-18 S. C. Tegler W. Romanishin G. J. Consolmagno Two Color Populations of Kuiper Belt and Centaur Objects and the Smaller Orbital Inclinations of Red Centaur Objects The Astronomical Journal 2016 152 6 210–223 2016AJ....152..210T 0004-6256 10.3847/0004-6256/152/6/210 free 2005-06-18 167P/CINEOS (2004 PY42) (NK 1185) OAA Computing and Minor Planet Sections Syuichi Nakano Syuichi Nakano http://www.oaa.gr.jp/~oaacs/nk/nk1185.htm 2012-02-20 Horizons Batch for 167P/CINEOS on 2066-Mar-18 JPL Horizons Perihelion occurs when rdot flips from negative to positive https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%27167P%27&START_TIME=%272066-Mar-18%27&STOP_TIME=%272066-Mar-20%27&STEP_SIZE=%271%20hours%27&QUANTITIES=%2719,22%27 https://web.archive.org/web/20220624114237/https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%27167P%27&START_TIME=%272066-Mar-17%27&STOP_TIME=%272066-Mar-21%27&STEP_SIZE=%271%20hours%27&QUANTITIES=%2719%27 2022-06-24 live 2022-06-24 (JPL#22 Soln.date: 2021-Apr-15) External links 1001647 167P 167P/CINEOS at the Minor Planet Center database 167P/CINEOS at Seiichi Yoshida's website 166P/NEAT 168P/Hergenrother Category:Chiron-type comets Category:Periodic comets 0167 * * *