Astronomy:Leonids

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Short description: Meteor shower associated with the comet Tempel–Tuttle
Leonids
Leonid Meteor.jpg
A Leonid meteor during the peak of the Leonids in 2009
Pronunciation/ˈliːənɪdz/
Discovery date902 AD (first record)[1]
Parent body55P/Tempel–Tuttle[2]
Radiant
ConstellationLeo
Right ascension 10h 17m[3]
Declination+21.6°[3]
Properties
Occurs during3 November – 2 December[3]
Date of peak17 November
Velocity70–71[3][4] km/s
Zenithal hourly rate15[3]
See also: List of meteor showers

The Leonids (/ˈliːənɪdz/ LEE-ə-nidz) are a prolific annual meteor shower associated with the comet Tempel–Tuttle, and are also known for their spectacular meteor storms that occur about every 33 years.[5] The Leonids get their name from the location of their radiant in the constellation Leo: the meteors appear to radiate from that point in the sky. Their proper Greek name should be Leontids (Ancient Greek:), but the word was initially constructed as a Greek/Latin hybrid and it has been used since. The meteor shower peak should be on 17 November, but any outburst in 2023 is likely to be from the 1767 meteoroid stream.[6]

Earth moves through meteoroid streams left from passages of a comet. The streams consist of solid particles, known as meteoroids, normally ejected by the comet as its frozen gases evaporate under the heat of the Sun when it is near the Sun – typically closer than Jupiter's orbit. Due to the retrograde orbit of 55P/Tempel–Tuttle, the Leonids are fast moving streams which encounter the path of Earth and impact at 70 km/s (43 mi/s).[3] It is the fastest annual meteor shower.[3] Larger Leonids which are about 10 mm (0.4 in) across have a mass of 0.5 g (0.02 oz) and are known for generating bright (apparent magnitude −1.5) meteors.[7] An annual Leonid shower may deposit 12 or 13 tons of particles across the entire planet.

The meteoroids left by the comet are organized in trails in orbits similar to – though different from – that of the comet. They are differentially disturbed by the planets, in particular Jupiter,[8] and to a lesser extent by radiation pressure from the Sun – the Poynting–Robertson effect and the Yarkovsky effect.[9] These trails of meteoroids cause meteor showers when Earth encounters them. Old trails are spatially not dense and compose the meteor shower with a few meteors per minute. In the case of the Leonids, that tends to peak around 18 November, but some are spread through several days on either side and the specific peak changes every year. Conversely, young trails are spatially very dense and the cause of meteor outbursts when the Earth enters one.

The Leonids also produce meteor storms (very large outbursts) about every 33 years, during which activity exceeds 1,000 meteors per hour,[10] with some events exceeding 100,000 meteors per hour,[11] in contrast to the sporadic background (5 to 8 meteors per hour) and the shower background (several meteors per hour).

Meteoroids[7]
Size Apparent Magnitude Comparable in brightness
2 mm (0.08 in) +3.7 (visual) Delta Ursae Majoris
10 mm (0.4 in) −1.5 (bright) Sirius
20 mm (0.8 in) −3.8 (Fireball) Venus

History

1800s

A sky full of shooting stars over a village
A famous depiction of the 1833 meteor storm, produced in 1889 for the Seventh-day Adventist book Bible Readings for the Home Circle.
A sky full of shooting stars over the Niagara falls
Woodcut print depicts the shower as seen at Niagara Falls, New York. Mechanics' Magazine said this illustration was made by an editor named Pickering "who witnessed the scene."

The Leonids are famous because their meteor showers, or storms, can be among the most spectacular. Because of the storm of 1833 and the developments in scientific thought of the time (see for example the identification of Halley's Comet), the Leonids have had a major effect on the scientific study of meteors, which had previously been thought to be atmospheric phenomena. Although it has been suggested the Leonid meteor shower and storms have been noted in ancient times,[12] it was the meteor storm of November 12-13, 1833 that broke into people's modern-day awareness. One estimate of the peak rate is over one hundred thousand meteors an hour,[13] while another, done as the storm abated, estimated in excess of 240,000 meteors during the nine hours of the storm,[1] over the entire region of North America east of the Rocky Mountains.

The event was marked by several nations of Native Americans: the Cheyenne established a peace treaty[14] and the Lakota calendar was reset.[15][16] Many Native American birthdays were calculated by reference to the 1833 Leonid event.[17] Abolitionists including Harriet Tubman and Frederick Douglass as well as slave-owners took note[18][19] and others.[20] The New York Evening Post carried a series of articles on the event including reports from Canada to Jamaica,[21] it made news in several states beyond New York[22][23] and, though it appeared in North America, was talked about in Europe.[24] The journalism of the event tended to rise above the partisan debates of the time and reviewed facts as they could be sought out.[25] Abraham Lincoln commented on it years later.[26] Near Independence, Missouri, in Clay County, a refugee Mormon community watched the meteor shower on the banks of the Missouri River after having been driven from their homes by local settlers.[27] Joseph Smith, the founder and first leader of Mormonism, afterwards noted in his journal for November 1833 his belief that this event was "a litteral [sic] fulfillment of the word of God" and a harbinger of the imminent second coming of Christ.[28] Though it was noted in the midwest and eastern areas it was also noted in Far West, Missouri.[29]

Denison Olmsted explained the event most accurately. After spending the last weeks of 1833 collecting information, he presented his findings in January 1834 to the American Journal of Science and Arts, published in January–April 1834,[30] and January 1836.[31] He noted the shower was of short duration and was not seen in Europe, and that the meteors radiated from a point in the constellation of Leo and he speculated the meteors had originated from a cloud of particles in space.[32] Accounts of the 1866 repeat of the Leonids counted hundreds per minute/a few thousand per hr in Europe.[33] The Leonids were again seen in 1867, when moonlight reduced the rates to 1,000 meteors per hour. Another strong appearance of the Leonids in 1868 reached an intensity of 1,000 meteors per hour in dark skies. It was in 1866–67 that information on Comet Tempel-Tuttle was gathered, pointing it out as the source of the meteor shower and meteor storms.[32] When the storms failed to return in 1899, it was generally thought that the dust had moved on and the storms were a thing of the past.

The November Meteors by Étienne Léopold Trouvelot, 1868

1900s

In 1966, a spectacular meteor storm was seen over the Americas.[34] Historical notes were gathered thus noting the Leonids back to 900 AD.[35] Radar studies showed the 1966 storm included a relatively high percentage of smaller particles while 1965's lower activity had a much higher proportion of larger particles. In 1981 Donald K. Yeomans of the Jet Propulsion Laboratory reviewed the history of meteor showers for the Leonids and the history of the dynamic orbit of Comet Tempel-Tuttle.[36] A graph[37] from it was adapted and re-published in Sky and Telescope.[38] It showed relative positions of the Earth and Tempel-Tuttle and marks where Earth encountered dense dust. This showed that the meteoroids are mostly behind and outside the path of the comet, but paths of the Earth through the cloud of particles resulting in powerful storms were very near paths of nearly no activity. But overall the 1998 Leonids were in a favorable position so interest was rising.

Leading up to the 1998 return, an airborne observing campaign was organized to mobilize modern observing techniques by Peter Jenniskens at NASA Ames Research Center.[39] In 1999, there were also efforts to observe impacts of meteoroids on the Moon, as an example of transient lunar phenomenon. A particular reason to observe the Moon is that our vantage from a location on Earth sees only meteors coming into the atmosphere relatively close to us, while impacts on the Moon would be visible from across the Moon in a single view.[40] The sodium tail of the Moon tripled just after the 1998 Leonid shower which was composed of larger meteoroids (which in the case of the Earth was witnessed as fireballs).[41] However, in 1999 the sodium tail of the Moon did not change from the Leonid impacts.

Research by Kondrat'eva, Reznikov and colleagues[42] at Kazan University had shown how meteor storms could be accurately predicted, but for some years the worldwide meteor community remained largely unaware of these results. The work of David J. Asher, Armagh Observatory and Robert H. McNaught, Siding Spring Observatory[8] and independently by Esko Lyytinen[43][44] in 1999, following on from the Kazan research, is considered by most meteor experts as the breakthrough in modern analysis of meteor storms. Whereas previously it was hazardous to guess if there would be a storm or little activity, the predictions of Asher and McNaught timed bursts in activity down to ten minutes by narrowing down the clouds of particles to individual streams from each passage of the comet, and their trajectories amended by subsequent passage near planets. However, whether a specific meteoroid trail will be primarily composed of small or large particles, and thus the relative brightness of the meteors, was not understood. But McNaught did extend the work to examine the placement of the Moon with trails and saw a large chance of a storm impacting in 1999 from a trail while there were less direct impacts from trails in 2000 and 2001 (successive contact with trails through 2006 showed no hits).[41]

Leonids as seen from space in 1997, NASA

2000s

Viewing campaigns resulted in spectacular footage from the 1999, 2001, and 2002 storms which produced up to 3,000 Leonid meteors per hour.[39] Predictions for the Moon's Leonid impacts also noted that in 2000 the side of the Moon facing the stream was away from the Earth, but that impacts should be in number enough to raise a cloud of particles kicked off the Moon which could cause a detectable increase in the sodium tail of the Moon.[41] Research using the explanation of meteor trails/streams have explained the storms of the past. The 1833 storm was not due to the recent passage of the comet, but from a direct impact with the previous 1800 dust trail.[45] The meteoroids from the 1733 passage of Comet Tempel-Tuttle resulted in the 1866 storm[46] and the 1966 storm was from the 1899 passage of the comet.[47] The double spikes in Leonid activity in 2001 and in 2002 were due to the passage of the comet's dust ejected in 1767 and 1866.[48] This ground breaking work was soon applied to other meteor showers – for example the 2004 June Bootids. Peter Jenniskens has published predictions for the next 50 years.[49] However, a close encounter with Jupiter is expected to perturb the comet's path, and many streams, making storms of historic magnitude unlikely for many decades. Recent work tries to take into account the roles of differences in parent bodies and the specifics of their orbits, ejection velocities off the solid mass of the core of a comet, radiation pressure from the Sun, the Poynting–Robertson effect, and the Yarkovsky effect on the particles of different sizes and rates of rotation to explain differences between meteor showers in terms of being predominantly fireballs or small meteors.[9]

Year Leonids active between Peak of shower ZHRmax
2006 19 Nov. Outburst of ZHR=35–40 was predicted from the 1932 trail.[50] 78[51]
2007 19 Nov. Outburst of ZHR=~30 from the 1932 trail was predicted for 18 Nov.[50] 35[52]
2008 14–22 November 17 Nov.[39] Considerable outburst of ZHR=130 from the 1466 trail was predicted for 17 Nov.[50] 99[53]
2009 10–21 November ZHRmax ranging from 100[54][55] to over 500[39][56][57] on 17 Nov. The peak was observed at predicted time.[58] 79[58]
2010 10–23 November 18 Nov 32±4[59][60]
2011 6–30 November 18 Nov 22±3[59][61]
2012 6–30 November 20 Nov. Nov 17 ZHR=5–10 (predicted) / 20 Nov ZHR=10–15 (predicted from 1400 trail)[50] 47±11[59][62]
2013 15–20 November 17 Nov but was washed out by a Full moon on 17 Nov –
2014 6–30 November 18 Nov 15±4[59][63]
2015 6–30 November 18 Nov[59] 15[64]
2016 6–30 November 17 Nov[65] 10–15[66]
2017 6–30 November 17 Nov[67] ~17[68]
2018 6–30 November 17 Nov[69] 15–20[70]
2019 6–30 November 17 Nov 10–15[71]
2020 6–30 November 17 Nov 10–15[72]
2021 6–30 November 17 Nov[73] 10–15[74]
2022 17-21 November 17 Nov (there was a low possibility of an outburst from the 1733 meteoroid stream on 19 November) 15 (predicted) - 300 (unlikely)[6]
2023 3 Nov - 2 Dec 17 Nov (a modest increase is possible from the 1767 meteoroid stream on 21 November)[6] 15 (predicted)[6]
2024 17 Nov 15–20 (predicted)[6]
2025 17 Nov (any outburst is likely to be from the 1699 meteoroid stream) 10–15 (predicted)[6]
2026 17 Nov 15 (predicted)[6]
2027 17 Nov (possible activity from 1167 meteoroid stream on 20 November) 40–50 (predicted)[6]
2028 17 Nov 30–40 (predicted)[6]
2029 17 Nov (possible activity from 1998 meteoroid stream) 30–40 (predicted)[6]
2030 17 Nov 15-20 (predicted)[6]
2031 17 Nov <10 (predicted)[75]
2032 17 Nov <10 (predicted)[75]
2033 17 Nov (Outburst likely from 1899 meteoroid stream. Encountering a younger stream typically generates more activity.) 35-400 (predicted)[75]
2034 17–18 Nov (probable outburst from the young 1932 meteoroid stream on 18 November) 40–500 (predicted)[75]
2061 (Possible outburst from the young 1998 meteoroid stream on 19 November) 50 (predicted) – 5100 (unlikely)[75]
2099 (Possible outburst from dense stream)[76] 1000+?

Predictions until the end of the 21st century have been published by Mikhail Maslov.[50]

See also

References

  1. ↑ 1.0 1.1 "Leonid MAC - Brief history of the Leonid shower". NASA. 2004. http://leonid.arc.nasa.gov/history.html. 
  2. ↑ Moore, Patrick; Rees, Robin (2011), Patrick Moore's Data Book of Astronomy (2nd ed.), Cambridge University Press, p. 275, ISBN 978-0-521-89935-2, https://books.google.com/books?id=2FNfjWKBZx8C&pg=PA275, retrieved 3 October 2016 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 "2023 Meteor Shower List". American Meteor Society (AMS). https://www.amsmeteors.org/meteor-showers/2020-meteor-shower-list/. Retrieved 2023-09-10. 
  4. ↑ Beech, Martin (July 1998), "Large-Body Meteoroids in the Leonid Stream", The Astronomical Journal 116 (1): 499–502, doi:10.1086/300435, Bibcode: 1998AJ....116..499B 
  5. ↑ Byrd, Deborah (15 November 2018). "All you need to know: 2019's Leonid meteor shower". EarthSky. https://earthsky.org/?p=29831. 
  6. ↑ 6.00 6.01 6.02 6.03 6.04 6.05 6.06 6.07 6.08 6.09 6.10 Mikhail, Maslov. "Leonids 2021-2030". http://feraj.ru/Radiants/Predictions/1901-2100eng/Leo2021-2030eng.html. 
  7. ↑ 7.0 7.1 Jenniskens, Peter (2006), Meteor Showers And Their Parent Comets, Cambridge University Press, p. 253, ISBN 978-0521853491, https://books.google.com/books?id=QpajMuyXG8AC&pg=PA253, retrieved 3 October 2016 
  8. ↑ 8.0 8.1 McNaught, Robert H.; Asher, David J. (1999). "Leonid Dust Trails and Meteor Storms". WGN, Journal of the International Meteor Organization 27 (2): 85–102. Bibcode: 1999JIMO...27...85M. 
  9. ↑ 9.0 9.1 Brown, Peter Gordon (1999). Evolution of Two periodic Meteoroid Streams: the Perseids and Leonids (Thesis). p. 4005. Bibcode:1999PhDT.........7B. Archived from the original on 5 June 2010. Retrieved 24 December 2009.
  10. ↑ Sophie Lewis (16 November 2019). "Leonids meteor shower will soon light up the sky. Here's how to watch.". CBS News. https://www.cbsnews.com/news/leonids-meteor-shower-2019-will-light-up-the-sky-heres-how-to-watch/. 
  11. ↑ Matthew Cappucci (18 November 2019). "Leonid shower a dud in 2019, but past years have featured extreme 'meteor storms'". The Washington Post. https://www.washingtonpost.com/weather/2019/11/18/leonid-shower-dud-past-years-have-featured-extreme-meteor-storms/. 
  12. ↑ Mohammed Omar Suleyman (2009). "The Leonid meteor shower and the history of the Semites (Arabs and Jews)". Journal of the International Meteor Organization 37 (3): 84–91. Bibcode: 2009JIMO...37...84S. 
  13. ↑ Joe Rao (12 November 2010). "The Leonid Meteor Shower Revealed: Shooting Star Show's Brilliant History". Space.com. https://www.space.com/9517-leonid-meteor-shower-revealed-shooting-star-show-brilliant-history.html. 
  14. ↑ "What is the underlying significance of the birth of the white buffalo?". AAA Native Arts. 2007-02-24. http://www.aaanativearts.com/mailbag-archive/1373-what-is-the-underlying-significance-of-the-birth-of-the-white-buffalo.html. 
  15. ↑ "Counting by Winters". Lakota Winter Counts Online Exhibit by the Smithsonian Institution National Museum of Natural History. Smithsonian Institution. http://wintercounts.si.edu/html_version/html/index.html. 
  16. ↑ Greene, Candace S.; Thornton, Russell, eds (June 2007). The Year the Stars Fell. ISBN 978-0-8032-2211-3. https://archive.org/details/yearstarsfelllak0000unse. 
  17. ↑ Zapffe, Carl A. (1975). Kahbe nagwi wens: The man who lived in 3 centuries. Brainerd, MN: Historic Heartland Association. p. 1. ISBN 978-0-910623-00-1.  in Roufs, Timothy G. (2008). When Everybody Called Me Gah-bay-bi-nayss, "Forever-Flying-Bird": An Ethnographic Biography of Paul Peter Buffalo. University of Minnesota Duluth. http://www.d.umn.edu/cla/faculty/troufs/Buffalo/PB41.html.  footnote 35
  18. ↑ "The Night the Stars Fell; My Search for Amanda Young". Freedmen of the Frontier – African American Historical and Genealogical Resource Page of the city of Ft. Smith Arkansas. http://www.angelfire.com/ar/freedmen/stars.html. 
  19. ↑ Bell, Madison Smartt (24 June 2007). "The Fugitive". New York Times. https://www.nytimes.com/2007/06/24/books/review/Bell.html?_r=2&ref=books&oref=slogin. 
  20. ↑ "The Great Leonid Meteor Storm of 1833 – A first-hand account by Elder Samuel Rogers". NASA Science News. 22 June 1999. https://science.nasa.gov/newhome/headlines/ast22jun99%5F2.htm. 
  21. ↑ * "Wednesday, November 13". The Evening Post (New York, New York): p. 2. 13 Nov 1833. https://www.newspapers.com/clip/179386/1833_leonids/. 
  22. ↑ * "Meteoric Phenomenon". The Adams Sentinel (Gettysburg, Pennsylvania): p. 3. 18 Nov 1833. https://www.newspapers.com/clip/179408/1833_leonids/. 
  23. ↑ Mary L. Kwas (1999). "The Spectacular 1833 Leonid Meteor Storm: The View from Arkansas". The Arkansas Historical Quarterly 58 (3): 314–324. doi:10.2307/40026232. 
  24. ↑ "At Halifax, Nova Scotia…". The Times (London, England): p. 5. 11 Dec 1833. https://www.newspapers.com/clip/179466/1833_leonids/. 
  25. ↑ Mark Littmann (September 2008). "American Newspapers and the Great Meteor Storm of 1833: A Case Study in Science Journalism". Journalism and Communication Monographs 10 (3): 249–284. doi:10.1177/152263790801000302. 
  26. ↑ Donald W. Olson; Laurie E. Jasinski (Nov 1999). "Abe Lincoln and the Leonids". Sky and Telescope 98 (5): 34–5. Bibcode: 1999S&T....98e..34O. http://media.skyandtelescope.com/documents/LincolnandLeonids.pdf. Retrieved 27 Oct 2015. 
  27. ↑ The autobiography of Parley Parker Pratt, one of the twelve apostles of the Church of Jesus Christ of Latter-day Saints: embracing his life, ministry and travels, with extracts, in prose and verse, from his miscellaneous writings. Chicago : Pub. for Pratt bros. by Law, King & Law. 1888. https://archive.org/stream/autobiographyofp00prat#page/n3/mode/2up. 
  28. ↑ The Joseph Smith Papers Journals Volume 1: 1832–1839
  29. ↑ Erwin F. Lange (August 1968). "Fireballs, meteorites, and meteor showers". The Ore Bin (Oregon. Dept. of Geology and Mineral Industries) 30 (8): 145–150. http://ir.library.oregonstate.edu/xmlui/handle/1957/3294. Retrieved 27 Oct 2015. 
  30. ↑ Olmsted, Denison (1833). "Observations on the Meteors of November 13th, 1833". The American Journal of Science and Arts 25: 363–411. https://www.biodiversitylibrary.org/page/30964366. Retrieved 3 April 2012. 
  31. ↑ Olmsted, Denison (1836). "Facts respecting the Meteoric Phenomena of November 13th, 1834.". The American Journal of Science and Arts 29 (1): 168–170. https://www.biodiversitylibrary.org/page/31127293. Retrieved 13 January 2018. 
  32. ↑ 32.0 32.1 Observing the Leonids Gary W. Kronk
  33. ↑ The Revelation of Bahá'u'lláh, Vol 2 by Adib Taherzadeh, Appendix I: The Star-fall of 1866
  34. ↑ "Eyewitness accounts of the 1966 Leonid Storm". P. Jenniskens/NASA-ARC. http://leonid.arc.nasa.gov/1966.html. 
  35. ↑ McIntosh, Bruce. A; Millman, Peter. M. (1970), "The Leonids by Radar--1957 to 1968", Meteoritics 5 (1): 1–18, doi:10.1111/j.1945-5100.1970.tb00385.x, Bibcode: 1970Metic...5....1M 
  36. ↑ Yeomans, Donald K. (September 1981), "Comet Tempel-Tuttle and the Leonid meteors", Icarus 47 (3): 492–499, doi:10.1016/0019-1035(81)90198-6, Bibcode: 1981Icar...47..492Y 
  37. ↑ "leokin4.gif". iltrails.org. http://www.iltrails.org/leokin4.gif. 
  38. ↑ Comet 55P/Tempel-Tuttle and the Leonid Meteors (1996, see p. 6)
  39. ↑ 39.0 39.1 39.2 39.3 "Return of the Leonids". NASA. 4 Dec 2008. https://science.nasa.gov/headlines/y2008/04dec_leonids2009.htm. 
  40. ↑ A Leonid on the Moon? by Dr. Tony Phillips
  41. ↑ 41.0 41.1 41.2 McNaught, Robert H. (2000-10-27). "Lunar Leonids: Encounters of the Moon with Leonid dust trails". spaceweather.com. http://www.spaceweather.com/meteoroutlook/lunarleonids.html. 
  42. ↑ Kondrat'eva, E.D.; Reznikov, E.A. (1985), "Comet Tempel-Tuttle and the Leonid meteor swarm", Solar System Research 19: 96–101, Bibcode: 1985AVest..19..144K 
  43. ↑ Lyytinen, Esko (1999), "#3 Leonid Predictions for the years 1999–2007 with the Satellite Model of Comets", Meta Research Bulletin 8: 33–40, http://metaresearch.org/publications/bulletin/#VOL8, retrieved 2010-01-10 
  44. ↑ Lyytinen, Esko J.; Flandern, Tom Van (January 2000), "Predicting the Strength of Leonid Outbursts", Earth, Moon, and Planets 82–83: 149–166, doi:10.1023/A:1017068618114, ISSN 1573-0794 ,
  45. ↑ Armagh Observatory Leonid dust trail positions in 1833.
  46. ↑ Leonid dust trail positions in 1866 Armagh Observatory
  47. ↑ Armagh Observatory Leonid dust trail positions in 1966
  48. ↑ Meteor Orbs.org Predictions & Observations of Lunar Meteor impacts
  49. ↑ Jenniskens, P. (2006). Meteor Showers and their Parent Comets. Cambridge, UK: Cambridge University Press. ISBN 978-0-521-85349-1. 
  50. ↑ 50.0 50.1 50.2 50.3 50.4 Maslov, Mikhail (2007), "Leonid predictions for the period 2001–2100", WGN, Journal of the International Meteor Organization 35 (1): 5–12, Bibcode: 2007JIMO...35....5M ; also see "Leonids 1901–2100". M. Maslov webpage. http://feraj.ru/Radiants/Predictions/1901-2100eng/Leonids1901-2100eng.html. 
  51. ↑ "Leonids 2006: Morning of 19 November". Archived from the original. Error: If you specify |archiveurl=, you must also specify |archivedate=. https://web.archive.org/web/20121013131705/http://imo.net/live/leonids2006/. 
  52. ↑ "Leonids 2007: visual data quicklook". Archived from the original. Error: If you specify |archiveurl=, you must also specify |archivedate=. https://web.archive.org/web/20121013134026/http://imo.net/live/leonids2007/. 
  53. ↑ "Leonids 2008: visual data quicklook". Archived from the original. Error: If you specify |archiveurl=, you must also specify |archivedate=. https://web.archive.org/web/20121013131729/http://imo.net/live/leonids2008/. 
  54. ↑ Fazekas, Andrew (16 November 2009). "Leonid Meteor Shower: Best Sky Show Tonight". National Geographic News. http://news.nationalgeographic.com/news/2009/11/091116-leonids-meteor-shower-best-2009.html. 
  55. ↑ "IMO Meteor Shower Calendar 2009". The International Meteor Organization. 1997–2009. http://www.imo.net/calendar/2009#leo. 
  56. ↑ "Strong Leonid Meteor Shower Predicted for 2009". Space.com. 4 December 2008. http://www.space.com/scienceastronomy/081204-leonids-meteor-shower-2009.html. 
  57. ↑ Lopez, Mike (7 December 2008). "Watch Out for Leonids 2009 Meteor Shower". http://science.mikelopez.info/2008/12/07/watch-out-for-leonids-2009-meteor-shower/. 
  58. ↑ 58.0 58.1 "Leonids 2009: visual data quicklook". The International Meteor Organization. http://www.imo.net/live/leonids2009. 
  59. ↑ 59.0 59.1 59.2 59.3 59.4 Dickinson, David. "From a Roar to a Purr: Prospects for the 2015 November Leonid Meteors". Universe Today. https://www.universetoday.com/123251/from-a-roar-to-a-purr-prospects-for-the-2015-november-leonid-meteors/. 
  60. ↑ "Leonids 2010: visual data quicklook". Archived from the original. Error: If you specify |archiveurl=, you must also specify |archivedate=. https://web.archive.org/web/20121127105159/http://imo.net/live/leonids2010/. 
  61. ↑ "Leonids 2011: visual data quicklook". Archived from the original. Error: If you specify |archiveurl=, you must also specify |archivedate=. https://web.archive.org/web/20121031161949/http://imo.net/live/leonids2011/. 
  62. ↑ "Leonids 2012: visual data quicklook". Archived from the original. Error: If you specify |archiveurl=, you must also specify |archivedate=. https://web.archive.org/web/20121219015552/http://imo.net/live/leonids2012/. 
  63. ↑ Anderson, Janet (14 November 2014). "Brilliant Leonids Meteor Shower Peak Occurs Morning of Nov. 18". NASA. https://www.nasa.gov/watchtheskies/leonid-meteor-shower-nov2014.html. 
  64. ↑ "Meteor Showers 2015". NASA. https://www.nasa.gov/beta/jpl/asteroids/best-meteor-showers. 
  65. ↑ Rao, Joe. "Leonid Meteor Shower Peaks This Week: Here's What to Expect". Space.com. https://www.space.com/34734-leonid-meteor-shower-2016-peaks-now.html. 
  66. ↑ Dickinson, David. "When good showers turn bad—the 2016 Leonids". Universe Today. https://www.universetoday.com/131915/good-showers-turn-bad-2016-leonids/. 
  67. ↑ Rao, Joe. "See the 2017 Leonid Meteor Shower at Its Peak: What to Expect". Space.com. https://www.space.com/38804-leonid-meteor-shower-2017-peaks-now.html. 
  68. ↑ Miskotte, Koen (19 May 2018). "The Leonids during the off season period part 1. 2017: a small outburst!". https://www.meteornews.net/2018/05/19/the-leonids-during-the-off-season-period-part-1-2017-a-small-outburst/. 
  69. ↑ Antier, Karl. "Observing 2018 Leonids". IMO. https://www.imo.net/observing-2018-leonids/. 
  70. ↑ "How to watch the Leonids, a dazzling meteor shower coming this weekend". 6abc. https://6abc.com/science/look-up-this-weekend-for-a-glimpse-of-the-leonid-meteor-shower/4696856/. 
  71. ↑ Rao, Joe. "The Leonid Meteor Shower 2019 Is Peaking Now: Here's What to Expect". Space.com. https://www.space.com/leonid-meteor-shower-2019-what-to-expect.html. 
  72. ↑ Newcomb, Alyssa. "The Leonid meteor shower is coming — here's when and how to watch". Today. https://www.today.com/news/leonid-meteor-shower-2020-what-it-how-watch-it-t197160. 
  73. ↑ "Meteor shower calendar 2021-2022". American Meteor Society. https://www.amsmeteors.org/meteor-showers/meteor-shower-calendar/. 
  74. ↑ Byrd, Deborah. "Leonid meteor shower 2021: What you need to know". EarthSky. https://earthsky.org/astronomy-essentials/everything-you-need-to-know-leonid-meteor-shower/. 
  75. ↑ 75.0 75.1 75.2 75.3 75.4 Mikhail, Maslov. "Leonids 1901-2100". http://feraj.ru/Radiants/Predictions/1901-2100eng/Leonids1901-2100eng.html. 
  76. ↑ "Meteor Shower Calendar 2022-2023". American Meteor Society (AMS). https://www.amsmeteors.org/meteor-showers/meteor-shower-calendar/#Leonids. Retrieved 2023-09-09. 

Further reading

External links



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