19P/Borrelly

Jupiter-family comet December 2025 19P/Borrelly b Q ' r E l i Comet Borrelly Nucleus.jpg The nucleus of Comet Borrelly as seen by NASA's Deep Space 1 mission in 22 September 2001. Alphonse Borrelly Marseille, France 28 December 1904 P/1904 Y2, P/1911 S1 1905 II, 1911 VIII 1918 IV, 1925 VIII 1932 IV, 1953 IV, 1960 V 1967 VIII, 1974 VII 1981 IV, 1987 XXXIII 1994 XXX jpldata19p 9 August 2022 (JD 2459800.5) 1.306 AU 5.90 AU 3.61 AU 0.6377 6.85 years 29.30° 0.324 AU e6km unit 0.443 AU e6km unit jpldata 8.0 xx 4.0 xx 4.0 km miWeaver_2003 0.3 g/cm3Britt_2006 0.072Rondón_2025 213 kgUsing the volume of an ellipsoid of 8x4x4 km * a rubble pile density of 0.3 g/cm3 yields a mass (md*v) of 2.013 kg 9.8 13.2 1 February 2022 11 December 2028Horizons2028 Perihelion distanceat recent epochs Epoch Perihelion(AU) 2028 1.310 2022 1.306 2015 1.349 2008 1.355 Comet Borrelly b Q ' r E l i or Borrelly's Comet (official designation: 19P/Borrelly) is a comet with a period of 6.85 years that was visited by the Deep Space 1 spacecraft in 2001. The comet last came to perihelion (closest approach to the Sun) on 1 February 2022 and will next come to perihelion on 11 December 2028. +19P/Borrelly closest Earth approach on 2028-Dec-05 Date & time ofclosest approach Earth distance(AU) Sun distance(AU) Velocitywrt Earth(km/s) Velocitywrt Sun(km/s) Uncertaintyregion(3-sigma) Reference 2028-Dec-05 19:12 ± 6 min 0.413 AU e6km e6mi LD unit on 1.31 AU e6km e6mi LD unit 17.3 33.3 ± 35 thousand km Horizons Deep Space 1 returned images of the comet's nucleus from 3400 kilometers away. At 45 meters per pixel, it was the highest resolution view ever seen of a comet up until that time.Beatty Kelly Meet Comet Borrelly https://skyandtelescope.org/astronomy-news/meet-comet-borrelly/ Sky & Telescope 27 January 2021 25 June 2004 Discovery The comet was discovered by Alphonse Borrelly during a routine search for comets at Marseille, France on 28 December 1904.February 2026 Exploration Deep Space 1 flyby thumb|left|Animation of Deep Space 1 trajectory from 24 October 1998 to 31 December 2003magenta Deep Space 1lime 9969 Brailleroyalblue EarthCyan 19P/Borrelly On 21 September 2001 the spacecraft Deep Space 1, which was launched to test new equipment in space, performed a flyby of Borrelly. It was steered toward the comet during the extended mission of the craft, and presented an unexpected bonus for the mission scientists. Despite the failure of a system that helped determine its orientation, Deep Space 1 managed to send back to Earth what were, at the time, the best images and other science data from a comet. left thumb|The orbits of three periodic comets, 1P/Halley, 19P/Borrelly and 153P/Ikeya-Zhang, set against the orbits of the outer planets. Notes References D. T. Britt G. J. Consol-magno W. J. Merline Small Body Density and Porosity: New Data, New Insights http://www.lpi.usra.edu/meetings/lpsc2006/pdf/2214.pdf 37th Annual Lunar and Planetary Science Conference League City, Texas 13–17 March 2006 2006LPI....37.2214B Horizons Batch for 19P/Borrelly (90000305) on 2028-Dec-11 JPL Horizons Perihelion occurs when rdot flips from negative to positive https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%27DES%3D19P%3BCAP%27&START_TIME=%272028-Dec-11%2020:00%27&STOP_TIME=%272028-Dec-12%27&STEP_SIZE=%2710%20minutes%27&QUANTITIES=%2719%27 https://web.archive.org/web/20230211125953/https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%2790000304%27&START_TIME=%272028-Dec-11%2021:00%27&STOP_TIME=%272028-Dec-12%27&STEP_SIZE=%2710%20minutes%27&QUANTITIES=%2719%27 2023-02-11 live 2023-07-06 (JPL#K222/14 Soln.date: 2023-May-25) 19P/Borrelly – JPL Small-Body Database Lookup https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=19P ssd.jpl.nasa.gov Jet Propulsion Laboratory 2025-12-20 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 H. A. Weaver S. A. Stern J. W. Parker Hubble Space Telescope STIS Observations of Comet 19P/Borrelly during the Deep Space 1 Encounter The Astronomical Journal The American Astronomical Society 126 1 444–451 2003 2003AJ....126..444W 10.1086/375752 free 2021-04-03 19P/Borrelly Seiichi Yoshida's Comet Catalog Seiichi Yoshida http://www.aerith.net/comet/catalog/0019P/index.html 2022-06-15 External links 1000005 19P 19P/Borrelly at the Minor Planet Center database 19P/Borrelly at Gary W. Kronk's Cometography 19P/Borrelly at Kazuo Kinoshita's website 18D/Perrine–Mrkos 20D/Westphal Category:Periodic comets 019P 0019 019P Category:Comets visited by spacecraft 019P 019P # * *