Astronomy:Draconids

From HandWiki
Draconids (DRA)
Pronunciation/drəˈkoʊnɪdz/
Parent body21P/Giacobini-Zinner[1]
Radiant
ConstellationDraco (constellation)
Right ascension 17.467h[1]
Declination+54°[1]
Properties
Occurs duringOctober 6 – October 10
Date of peakOctober 8
Velocity20[2] km/s
Zenithal hourly ratevariable[1]
See also: List of meteor showers

The October Draconids, in the past also unofficially known as the Giacobinids, are a Northern hemisphere meteor shower whose parent body is the periodic comet 21P/Giacobini-Zinner. They are named after the constellation Draco, where they seemingly come from. Almost all meteors which fall towards Earth ablate long before reaching its surface. The Draconids are best viewed after sunset in an area with a clear dark sky.

The 1933[1][3][4] and 1946[1] Draconids had Zenithal Hourly Rates of thousands of meteors visible per hour, among the most impressive meteor storms of the 20th century. Rare outbursts in activity can occur when the Earth travels through a denser part of the cometary debris stream; for example, in 1998, rates suddenly spiked[5][6] but only increased modestly in 2005.[7] A Draconid meteor outburst occurred[8] as expected[9][10][11] on October 8, 2011, though a waxing gibbous Moon reduced the number of meteors observed visually. During the 2012 shower radar observations (which detect smaller and fainter meteors) detected up to 1000 meteors per hour. The 2012 outburst may have been caused by the narrow trail of dust and debris left behind by the parent comet in 1959.[12]

Draconid Outbursts
Date Stream ZHR
1933-Oct-09 1900 6000[1]
1946-Oct-09 1900 3000[1]
1952-Oct-09 174 (radar)[1]
1998-Oct-08 720[6]
2005-Oct-08 1946 150 (radar) / 40 (visual)[7]
2011-Oct-08 1900[13] 300[8]
2012-Oct-08 1959 1000 (radar)[12]
2018-Oct-08 1952 150[14]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Kronk, Gary W. "Draconids ("Giacobinids")". http://meteorshowersonline.com/showers/draconids.html. 
  2. ↑ Żołądek, P. et al. (October 2009), "The 2004 Perseid meteor shower – Polish Fireball Network double station preliminary results", Journal of the International Meteor Organization 37 (5): 161–163, Bibcode: 2009JIMO...37..161Z 
  3. ↑ "The meteors from Giacobini's comet", Wylie, C. C., Popular Astronomy, Vol. 42, p. 44, "The meteors from Giacobini's comet" (in en). http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1934PA.....42...44W&db_key=AST&page_ind=0&data_type=GIF&type=SCREEN_VIEW&classic=YES. 
  4. ↑ John McFarland and Mark Bailey (October 7, 2011). "Account of the 1933 Draconids meteor storm". International Meteor Organization (IMO). http://www.imo.net/docs/ellison_1933_draconids_storm_account.txt. 
  5. ↑ "Giacobinids dazzle observers". October 14, 1998. https://science.nasa.gov/newhome/headlines/ast14oct98_2.htm. 
  6. ↑ 6.0 6.1 Arlt, R. "Summary of 1998 Draconid Outburst Observations", WGN, Journal of the International Meteor Organization, Vol. 26, p. 256-259, 1998.
  7. ↑ 7.0 7.1 Campbell-Brown, M.; Vaubaillon, J.; Brown, P.; Weryk, R. J.; Arlt, R. "The 2005 Draconid outburst", Astronomy and Astrophysics, Volume 451, pp. 339–344, 2006.
  8. ↑ 8.0 8.1 "Draconids show expected outburst". International Meteor Organization (IMO). http://www.imo.net/draconids2011results. 
  9. ↑ Adrian West (October 3, 2011). "The Draconid Meteor Shower – A Storm is Coming!". Universe Today. http://www.universetoday.com/89430/the-draconid-meteor-shower-a-storm-is-coming/. "Observers in the UK and Northern Europe are ideally placed to see the peak of the Draconids. Unfortunately the peak occurs in the day time for North America. There will also be a bright Moon which may drown out many but the brightest meteors, but if predictions are correct, you will still see many. You may see Draconid meteors on the 7th and the 9th also, so it is worth going out and checking the skies." 
  10. ↑ "Draconids Meteor Shower on 8 October 2011". International Meteor Organization. http://www.imo.net/draconids2011. 
  11. ↑ Beatty, Kelly. "A Deluge of Draconids?". Sky and Telescope. Highlights. https://skyandtelescope.org/astronomy-news/observing-news/a-deluge-of-draconids/. 
  12. ↑ 12.0 12.1 Geert Barentsen (2012-10-08). "Draconids show outburst (again!)". http://barentsen.wordpress.com/2012/10/08/draconids-2012/. 
  13. ↑ "IMCCE Meteor Shower Ephemerides: 2011 Draconids". IMCCE. http://www.imcce.fr/en/ephemerides/phenomenes/meteor/DATABASE/Draconids/2011/index.php. 
  14. ↑ "2023 Meteor Shower Calendar". International Meteor Organization. https://imo.net/files/meteor-shower/cal2023.pdf. 

External links




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