153P/Ikeya–Zhang

Long-period comet other comets discovered by Kaoru Ikeya Comet Ikeya 153P/Ikeya-Zhang Comet-Ikeya-Zhang.jpeg Comet Ikeya–Zhang photographed by Philipp Salzgeber on 1 April 2002 Kaoru IkeyaZhang Daqing 1 February 2002 X/877 L1Hasegawa_2003Kronk Meyer Seargent 1999 138–139 X/1273 G1Uso_2026Kronk Meyer Seargent 1999 223 C/1661 C1cometographyKronk Meyer Seargent 1999 348–350 C/2002 C1 jpldata 8 May 2002 (JD 2452402.5) 341–1,125 years February 877Hasegawa_20033 February 1661Kronk Meyer Seargent 1999 348–350 1,893 0.507 AU 101.73 AU 51.119 AU 365.49 years 59 km/s(2002-03-18) 0.29 km/sspeed(2182-Nov-24) 0.99008 28.121° 93.369° 34.668° 0.135° 0.879 0.332 AU 0.011 AU jpldata 5.09 km miRondón_2025 0.3Rondón_2025 1.48 0.2 daysManzini_2007 4.0 2.9(2002 apparition) 18 March 2002jpldata MPC29 January 1661Nakano_2002 1 September 2362Nakano_200214 March 2363Horizons2363 Comet Ikeya–Zhang (Japanese, Chinese: 池谷-張彗星, officially designated 153P/Ikeya–Zhang) is a long-period comet discovered independently by two astronomers from Japan and China in 2002. It has by far the longest orbital period of the numbered periodic comets. It was last observed in October 2002 when it was about 3.3 AU e6km unit from the Sun.jpldata Discovery and observations On 1 February 2002, Chinese astronomer Zhang Daqing from Kaifeng discovered a new comet in the constellation Cetus, and reported it to the IAU. He found that Japanese astronomer Kaoru Ikeya had discovered it earlier than he had, as the time of sunset is earlier than China. According to tradition, since they discovered the new comet independently, the comet was named after both of them. The comet was initially designated as C/2002 C1 (Ikeya–Zhang). The comet was observed in 1661, 341 years earlier, by Polish astronomer Johannes Hevelius.Green_2004Kronk Meyer Seargent 1999 348–350 A bright comet had also been recorded by Chinese astronomers in 1661.Kronk Meyer Seargent 1999 348–350 Further research by Ichiro Hasegawa and Shuichi Nakano concluded that historical comets recorded in AD 877Kronk Meyer Seargent 1999 138–139 and 1273Kronk Meyer Seargent 1999 223 were likely previous apparitions of Ikeya–Zhang as well.Hasegawa_2003 The permanent designation "153P" was given to the comet. It has the longest known orbital period of any periodic comet (366.51 years). Its orbital speed around the Sun varies from 59 km/s mi/s at perihelion to 0.29 km/s mi/s at aphelion.speed The comet passed perihelion on 18 March 2002, and with apparent magnitude 2.9. With a multi-hundred year orbit involving asymmetric outgassing, the next perihelion passage is expected between 2362–2363. During March–April 2002, protons from the comet tail may have been detected by the Cassini–Huygens spacecraft. This data suggested the comet tail had a length greater than 7.5 AU e9km unit, making it the longest yet detected.Jones_2020 Orbit thumb|center|450px|The orbits of three periodic comets, Halley, Borrelly and Ikeya–Zhang, set against the orbits of the outer planets. Ikeya–Zhang is to the right.|alt=The orbital paths of three comets, outlined in turquoise, against the orbits of Jupiter, Saturn, Uranus and Neptune, outlined in green See also Johannes Hevelius List of Solar System objects by greatest aphelion Notes speed v = 42.1219 1/r − 0.5/a, where r is the distance from the Sun, and a is the major semi-axis. References G. W. Kronk 153P/Ikeya–Zhang https://cometography.com/pcomets/153p.html Cometography.com 19 October 2017 D. W. Green Assessment of early-modern observations of Comets and Supernovae: Focus on Pre-telescopic European astrometric and physical data https://etheses.dur.ac.uk/3053/1/3053_1077.pdf Doctoral Durham University 2004 213–228 I. Hasegawa S. Nakano Orbit of periodic comet 153P/Ikeya–Zhang Monthly Notices of the Royal Astronomical Society 2003 345 3 883–888 2003MNRAS.345..883H 10.1046/j.1365-8711.2003.07009.x free Horizons Batch for 153P/Ikeya–Zhang (90001080) on 2363-Mar-14 Perihelion occurs when rdot flips from negative to positive https://ssd.jpl.nasa.gov/api/horizons.api?format=text&COMMAND=%27DES%3D153P%3BCAP%27&START_TIME=%272363-Mar-01%27&STOP_TIME=%272363-Mar-30%27&STEP_SIZE=%273%20hours%27&QUANTITIES=%2719%27 JPL Horizons 10 April 2021 (JPL#74/Soln.date: 2020-Jun-17) G. H. Jones H. A. Elliott D. J. McComas M. E. Hill J. Vandegriff E. J. Smith F. J. Crary J. Waite 4 Cometary Ions detected by the Cassini spacecraft 6.5 AU downstream of Comet 153P/Ikeya-Zhang https://www.sciencedirect.com/science/article/pii/S0019103522002986/pdfft?md5=6f65fc206d1bed9b528f4459c7b361f6&pid=1-s2.0-S0019103522002986-main.pdf Icarus 2020 388 15199 2022Icar..38815199J 2006.00500 10.1016/j.icarus.2022.115199 free 153P/Ikeya–Zhang – JPL Small-Body Database Lookup https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=153P ssd.jpl.nasa.gov Jet Propulsion Laboratory 20 April 2011 F. Manzini G. Schwarz C. B. Cosmovici C. Guaita L. Comolli A. Brunati R. Crippa 4 Comet Ikeya-Zhang (C/2002 C1): Determination of the Rotation Period From Observations of Morphological Structures https://link.springer.com/content/pdf/10.1007/s11038-005-9062-6.pdf Earth, Moon, and Planets 2007 100 1–2 1–16 2007EM&P..100....1M 10.1007/s11038-005-9062-6 free 153P/Ikeya–Zhang https://www.minorplanetcenter.net/db_search/show_object?object_id=153p www.minorplanetcenter.net Minor Planet Center 25 February 2019 S. Nakano 153P/Ikeya-Zhang https://www.oaa.gr.jp/~oaacs/nk/nk865.htm OAA Computing and Minor Planet Sections 13 August 2002 4 October 2009 E. Rondón F. Roig D. Lazzaro F. Fernandez Secular light curves of periodic comets observed by SWAN/SOHO https://academic.oup.com/mnras/article-pdf/538/4/2869/62575557/staf454.pdf Monthly Notices of the Royal Astronomical Society 2025 538 4 2869–2904 2025MNRAS.538.2869R 10.1093/mnras/staf454 free M. J. M. Uso F. J. M. Castillo Revisiting the Orbit of 153P/Ikeya–Zhang: Constraints from Non-Gravitational Forces and Historical Observations 2026 Planetary and Space Science 106322 10.1016/j.pss.2026.106322 free Bibliography Kronk Gary W. Meyer Maik Seargent David A. J. 1999 Cometography: A Catalog of Comets 1: Ancient–1799 Cambridge University Press 978-0-521-58504-0 External links 1000374 153P 153P/Ikeya–Zhang at the Minor Planet Center database 153P/Ikeya–Zhang at Seiichi Yoshida's website 152P/Helin–Lawrence 154P/Brewington Category:Periodic comets 0153 # 0153