143P/Kowal–Mrkos

Jupiter-family comet other comets of the same name Comet Kowal Comet Mrkos (disambiguation)Comet Mrkos August 2026 143P/Kowal–Mrkos IAUC_3988 Charles T. KowalAntonín Mrkos Palomar ObservatoryKlet' Observatory 2 May 1984 D/1984 H1 P/1984 JD P/2000 ET 90 1984 X, 1984n jpldata MPC 5 May 2025 (JD 2460800.5) 40.83 years 23 April 1984 1,231 2.942 AU 6.618 AU 4.780 AU 0.38458 10.451 years 5.472° 242.62° 304.32° 303.47° 2.864 1.537 AU 0.019 AU Jewitt_2003 5.7 0.6 km (V–R) 0.58 0.02 17.21 0.10 hours 14.5 7 May 2018 28 December 2026Horizons2026 143P/Kowal–Mrkos is a periodic comet in the Solar System. Observational history Discovery and loss Antonín Mrkos first reported the discovery of this comet as an asteroid named 1984 JD, after spotting it as a 16th-magnitude object on the night of 2 May 1984.Kronk_2017 In September 1984, Charles T. Kowal analyzed photographic plates exposed on the night of 23 April 1984 and he noted the comet as almost stellar-like, with a faint but discernible coma.Kronk_2017 Brian G. Marsden immediately recognized that Kowal's object is identical to that of Mrkos' discovery, allowing him to calculate an elliptical orbit for the object,IAUC_3988 which allowed Mrkos to notice that he indeed captured faint cometary activity on images he took on 19 May.IAUC_4001 However, it was not observed beyond that date, and was initially considered lost, subsequently redesignated as D/1984 H1.Kronk_2017 Recovery It was not observed during the comet's predicted apparition in 1992.cometography Shuichi Nakano later revised his orbital calculations for the comet in 1997, which allowed him to predict that the comet may next return by 2000.Kronk_2017 It was successfully recovered on 9 March 2000, when LINEAR and LONEOS spotted an asteroid-like object with a comet-like orbit (2000 ET 90), which Marsden noted matched those predicted for Kowal–Mrkos.IAUC_7403 References G. W. Kronk 143P/Kowal–Mrkos https://cometography.com/pcomets/143p.html Cometography.com 26 May 2025 Horizons Batch for 143P/Kowal-Mrkos on 2026-Dec-28 JPL Horizons Perihelion occurs when rdot flips from negative to positive https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%27143P%27&START_TIME=%272026-Dec-28%27&STOP_TIME=%272026-Dec-29%27&STEP_SIZE=%273%20hours%27&QUANTITIES=%2719%27 29 April 2023 (JPL#94/Soln.date: 2022-Nov-29) C. T. Kowal A. Mrkos B. G. Marsden Periodic Comet Kowal–Mrkos (1984n) http://www.cbat.eps.harvard.edu/iauc/03900/03988.html IAU Circular 21 September 1984 3988 1 1984IAUC.3988....1K A. Mrkos B. G. Marsden Periodic Comet Kowal–Mrkos (1984n) http://www.cbat.eps.harvard.edu/iauc/04000/04001.html IAU Circular 25 October 1984 4001 1 1984IAUC.4001....1M G. V. Williams T. B. Spahr C. W. Hergenrother B. G. Marsden Comet P/2000 ET 90 (Kowal–Mrkos) http://www.cbat.eps.harvard.edu/iauc/07400/07403.html IAU Circular 15 April 2000 7403 1 2000IAUC.7403....1W D. C. Jewitt S. S. Sheppard Y. R. Fernández 143P/Kowal–Mrkos and the Shapes of Cometary Nuclei The Astronomical Journal 2003 125 6 3366–3377 2003AJ....125.3366J 53614673 10.1086/374947 free 143P/Kowal–Mrkos – JPL Small-Body Database Lookup https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=143P ssd.jpl.nasa.gov Jet Propulsion Laboratory 26 May 2025 G. W. Kronk M. Meyer D. A. J. Seargent Cometography: A Catalog of Comets 2017 6: 1983–1993 85–86 Cambridge University Press 978-0-521-87216-4 143P/Kowal–Mrkos Orbit https://www.minorplanetcenter.net/db_search/show_object?object_id=143P Minor Planet Center 18 June 2014 External links 1000057 143P 143P/Kowal–Mrkos at the Minor Planet Center database 143P/Kowal–Mrkos at Seiichi Yoshida's website 143P/Kowal–Mrkos at Gary W. Kronk's Cometography 142P/Ge–Wang 144P/Kushida Category:Periodic comets 0143 143P + Category:Discoveries by Charles T. Kowal 143P 143P * *