152P/Helin–Lawrence

Jupiter-family comet other comets of the same name Comet Helin November 2025 152P/Helin–Lawrence IAUC_5810 Eleanor F. HelinKenneth J. Lawrence Palomar Observatory 17 May 1993 P/1993 K2P/2001 Y1 1993 XI, 1993lICQ1 jpldata MPC 21 February 2025 (JD 2461000.5) 31.71 yearsobs_arc 21 April 1993 1,324 3.111 AU 5.862 AU 4.486 AU 0.30656 9.51 years 9.879° 91.776° 164.41° 146.10° 2.901 2.099 AU 0.338 AU jpldata 4.6 km miLamy_2004 480 80 kg/m3Paradowski_2022 12.7 13 January 2022NK2190 9 July 2031Horizons2031 152P/Helin–Lawrence is a Jupiter-family comet with a 9.51-year orbit around the Sun. It is the third comet co-discovered by Eleanor F. Helin and Kenneth J. Lawrence.comet_helin-lawrencecomet_helin Observational history Both Helin and Lawrence discovered the diffuse trails of the comet from the photographic plates exposed from the Palomar Observatory on the night of 17 May 1993.IAUC_5810 At the time, it was a 17th-magnitude object within the constellation Scorpio.Reported initial position upon discovery was: α 16 45.3, δ –16 06Kronk_2017 Shortly after the announcement of its discovery, Robert H. McNaught was able to observe it during the total lunar eclipse of 4 June 1995.IAUC_5811 It was recovered from the Saji Observatory by T. Oribe and Shuichi Nakano on 24 December 2001,IAUC_7790 where Oribe reported that the comet had an 8 arcsecond-long tail.IAUC_7794 On 11 January 2002, the comet showed a diffuse coma about 8 arcseconds wide and a tail about 13 arcseconds in length.IAUC_7792 Physical characteristics Polarimetric observations from the European Southern Observatory in 2012 revealed that both 74P/Smirnova–Chernykh and 152P/Helin–Lawrence still produce cometary activity even at large heliocentric distances, suggesting that both comets were relative newcomers to the inner Solar System and thus contain large reservoirs of volatile material in their respective interiors.Stinson_2016 The nucleus of 152P/Helin–Lawrence is estimated to be around 4.6 km mi in diameter,Lamy_2004 based on observations conducted using the Hubble and Keck telescopes in 1998.Meech_2004 Notes "comet_helin" 152P is also the 12th and final comet discovered by Eleanor Helin, excluding her rediscovery of 107P/Wilson–Harrington "comet_helin-lawrence" Eleanor Helin and Kenneth Lawrence co-discovered C/1991 F2 and C/1992 Q2 prior to 152P. "obs_arc" Observation arc from the Minor Planet Center database covering dates from 21 April 1993 until 4 January 2025. References Horizons Batch for 152P/Helin–Lawrence on 2031-Jul-09 JPL Horizons Perihelion occurs when rdot flips from negative to positive https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%27152P%27&START_TIME=%272031-Jul-06%27&STOP_TIME=%272031-Jul-12%27&STEP_SIZE=%273%20hours%27&QUANTITIES=%2719%27 2022-06-22 (JPL#72 Soln.date: 2022-Jun-20) E. F. Helin K. J. Lawrence M. Nassir etal D. W. Green Comet Helin–Lawrence (1993l) http://www.cbat.eps.harvard.edu/iauc/05800/05810.html IAU Circular 1993-06-02 5810 1 1993IAUC.5810....1H E. F. Helin K. J. Lawrence M. Nassir etal D. W. Green Periodic Comet Helin–Lawrence (1993l) http://www.cbat.eps.harvard.edu/iauc/05800/05811.html IAU Circular 1993-06-04 5811 1 1993IAUC.5811....1H S. Nakano T. Oribe B. G. Marsden etal D. W. Green Comet P/2001 Y1 (Helin–Lawrence) http://www.cbat.eps.harvard.edu/iauc/07700/07790.html IAU Circular 2002-01-14 7790 1 2002IAUC.7790....1N K. Sarneczky D. W. Green Comet P/2001 Y1 (Helin–Lawrence) http://www.cbat.eps.harvard.edu/iauc/07700/07792.html IAU Circular 2002-01-15 7792 4 2002IAUC.7792....4S T. Oribe D. W. Green Comet P/2001 Y1 (Helin–Lawrence) http://www.cbat.eps.harvard.edu/iauc/07700/07794.html IAU Circular 2002-01-17 7794 3 2002IAUC.7794....3O Comet Names and Designations http://www.icq.eps.harvard.edu/names1.html International Comet Quarterly 2025-11-26 152P/Helin–Lawrence – JPL Small-Body Database Lookup https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=152P ssd.jpl.nasa.gov Jet Propulsion Laboratory 2025-11-26 G. W. Kronk M. Meyer D. A. J. Seargent Cometography: A Catalog of Comets 2017 6: 1983–1993 783–787 Cambridge University Press 978-0-521-87216-4 P. L. Lamy I. Toth Y. R. Fernández H. A. Weaver Comets II The Sizes, Shapes, Albedos, and Colors of Cometary Nuclei https://physics.ucf.edu/~yfernandez/papers/comets2chapter/comets2reprint.pdf 2004 223–264 University of Arizona Press 10.2307/j.ctv1v7zdq5.22 2004come.book..223L j.ctv1v7zdq5.22 978-0-8165-2450-1 9 October 2022 28 November 2025 https://ghostarchive.org/archive/20221009/https://physics.ucf.edu/~yfernandez/papers/comets2chapter/comets2reprint.pdf dead K. J. Meech O. R. Hainaut B. G. Marsden Comet nucleus size distributions from HST and Keck telescopes Icarus 2004 170 2 463–491 2004Icar..170..463M 10.1016/j.icarus.2004.03.014 152P/Helin–Lawrence Orbit http://www.minorplanetcenter.net/db_search/show_object?object_id=152P Minor Planet Center 2014-06-18 S. Nakano 152P/Helin–Lawrence (NK 2031) http://www.oaa.gr.jp/~oaacs/nk/nk2031.htm OAA Computing and Minor Planet Sections 2011-02-06 2012-02-25 M. L. Paradowski A New Indirect Method of Determining Density of Cometary Nuclei https://acta.astrouw.edu.pl/Vol72/n2/pdf/pap_72_2_4.pdf Acta Astronomica 2022 72 2 141–159 2022AcA....72..141P 0001-5237 10.32023/0001-5237/72.2.4 free A. Stinson S. Bagnulo G. P. Tozzi etal Polarimetry of comets 67P/Churyumov–Gerasimenko, 74P/Smirnova–Chernykh, and 152P/Helin–Lawrence https://www.aanda.org/articles/aa/pdf/2016/10/aa27696-15.pdf Astronomy & Astrophysics 2016 594 A110 1–16 2016A&A...594A.110S 1606.05192 10.1051/0004-6361/201527696 free External links 1000145 152P 152P/Helin–Lawrence at the Minor Planet Center database 152P/Helin–Lawrence at Gary W. Kronk's Cometography 152P/Helin–Lawrence at Seiichi Yoshida's website 151P/Helin 153P/Ikeya–Zhang Category:Periodic comets 0152 0152 152P 152P # * * 0152 0152