Wikipedia

Geminids

The Geminids are a prolific meteor shower, the parent body of which is 3200 Phaethon (which is thought to be an Apollo asteroid[4] with a "rock comet" orbit[5]).[6] Because of this, it would make this shower, along with the Quadrantids, the only major meteor showers not originating from a comet. The meteors from this shower are slow; they can be seen in December and usually peak around December 4–16, with the date of highest intensity being the morning of December 14. Current showers produce up to 120–160 meteors per hour under optimal conditions, peaking at around 2:00 or 3:00. Geminids were first observed in 1862,[1] much later than other showers such as the Perseids (36 AD) and Leonids (902 AD).

Geminids (GEM)
The Geminids meteor shower as seen from the Northern Hemisphere, in December 2013
Pronunciation/ˈdʒɛmənədz/
Discovery date1862[1]
Parent body3200 Phaethon[2]
Radiant
ConstellationGemini (near Castor)
Right ascension07h 28m [2]
Declination+32°[2]
Properties
Occurs during4 December – 17 December[2]
Date of peak14 December[2]
Velocity35[3] km/s
Zenithal hourly rate120[2]
See also: List of meteor showers

Based on data from the Parker Solar Probe, a 2023 study suggested that the Geminids may have been formed by the catastrophic breakup of a comet that formed asteroids 2005 UD and 1999 YC in addition to Phaethon.[7][8]

Background

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The Geminid meteor shower is unique among celestial events as it originates not from a comet but from the asteroid 3200 Phaethon, discovered on Oct. 11, 1983, by the Infrared Astronomical Satellite (IRAS). Phaethon's 1.4-year orbit around the Sun and its comet-like elliptical trajectory have led scientists to speculate if it is a "dead comet" or a distinct celestial entity known as a "rock comet". Despite its comet-like orbit, Phaethon lacks a cometary tail and exhibits spectra resembling a rocky asteroid. The Geminid meteoroids formed from Phaethon are denser (2–3 g/cm3) than typical cometary dust flakes (0.3 g/cm3). Named after the Greek mythological figure who drove the Sun-god Helios' chariot, Phaethon's discovery was attributed to astronomer Fred Whipple.[9]

Radiant

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Appearance of the Geminids on 13 December 2025 at 21:00 local winter time
 
A Geminid meteor in 2007, seen from San Francisco
 
Asteroid (3200) Phaethon, parent body of the Geminids, imaged on 25 December 2010, with the 37 cm F14 Cassegrain telescope of Winer Observatory, Sonoita (MPC 857)

The meteors in this shower appear to come from the radiant in the constellation Gemini (hence the shower's name). However, they can appear almost anywhere in the night sky, and often appear yellowish in hue. Well north of the equator, the radiant rises about sunset, reaching a usable elevation from the local evening hours onwards. In the southern hemisphere, the radiant appears only around local midnight or so. Observers in the northern hemisphere will see higher Geminid rates as the radiant is higher in the sky.[10] The meteors travel at medium speed in relation to other showers, at about 22 miles per second (35 km/s), making them fairly easy to spot. They usually fall apart while at heights above 24 miles (39 km).[11]

 
Animated GIF of a Geminid meteor falling earthwards

Timeline

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Year Peak of shower ZHRmax Lunar phase[12]
2006 December 14 132[13] 33% waning crescent
2007 December 14 170[14] 30% waxing crescent
2008 December 13 114[15] 95% full moon
2009 December 14 140[16] 9% new moon
2010 December 14 126[17] 59% first quarter
2011 December 14 193[18] 86% waning gibbous
2012 December 13 134[19] 2% new moon
2013 December 14 172[20] 92% full moon
2014 December 13 168[21] 50% last quarter
2015 December 14 203[22] 10% waxing crescent
2016 December 14 157[23] 100% full moon
2017 December 14 145[24] 13% waning crescent
2018 December 14 155±9[25][26] 41% waxing crescent
2019 December 14 111[27] 94% waning gibbous
2020 December 14 133[28] 2% waning crescent
2021 December 14 128[29] 73% waxing gibbous
2022 December 14 113[30] 72% waning gibbous
2023 December 14 92[31] 0% waxing crescent
2024 December 13-14[32] 112[33] 99% waxing gibbous
2025 December 14[34] 150 26% waning crescent

See also

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References

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  1. ^ a b Kronk, Gary W. "Observing the Geminids". Meteor Showers Online. Archived from the original on 17 May 2008. Retrieved 14 November 2012.
  2. ^ a b c d e f 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.
  3. ^ "IMO Meteor Shower Calendar 2012: Geminids (GEM)". International Meteor Organization. Retrieved 2012-12-13.
  4. ^ "Small-Body Database Lookup". ssd.jpl.nasa.gov. Retrieved 2024-05-19.
  5. ^ Jewitt, David; Li, Jing (2010). "Activity in Geminid Parent (3200) Phaethon". The Astronomical Journal. 140 (5): 1519–1527. arXiv:1009.2710. Bibcode:2010AJ....140.1519J. doi:10.1088/0004-6256/140/5/1519. S2CID 6446528.
  6. ^ Marsden, Brian G. (25 October 1983). "IAUC 3881: 1983 TB and the Geminid Meteors; 1983 SA; KR Aur (Circular No. 3881)". Central Bureau for Astronomical Telegrams. Archived from the original on 1 May 2012. Retrieved 18 May 2009.
  7. ^ Cukier, W.Z.; Szalay, J.R. (1 June 2023). "Formation, Structure, and Detectability of the Geminids Meteoroid Stream". The Planetary Science Journal. 4 (6): 109. arXiv:2306.11151. doi:10.3847/psj/acd538. ISSN 2632-3338.
  8. ^ Rayne, Elizabeth (27 June 2023). "We finally know how the mysterious Geminid meteor shower originated". Ars Technica. Retrieved 29 June 2023.
  9. ^ "Geminids – NASA Science". science.nasa.gov. Retrieved 2023-12-12.
  10. ^ "Radiant (Northern vs Southern)". NASA Meteor Watch on Facebook. 2012-12-12. Retrieved 2012-12-14.
  11. ^ "NASA All Sky Fireball Network: Geminid End Heights". NASA Meteor Watch on Facebook. 2012-12-11. Retrieved 2012-12-11.
  12. ^ "Moongiant". www.moongiant.com.
  13. ^ "Geminids 2006 ZHR". International Meteor Organization. 20 December 2006.
  14. ^ "Geminids 2007 ZHR". International Meteor Organization. 20 December 2007.
  15. ^ "Geminids 2008 ZHR". International Meteor Organization. 20 December 2008.
  16. ^ "Geminids 2009 ZHR". International Meteor Organization. 20 December 2009.
  17. ^ "Geminids 2010 ZHR". International Meteor Organization. 20 December 2010.
  18. ^ "Geminids 2011 ZHR". International Meteor Organization. 20 December 2011.
  19. ^ "Geminids 2012 ZHR". International Meteor Organization. 20 December 2012.
  20. ^ "Geminids 2013 ZHR". International Meteor Organization. 20 December 2013.
  21. ^ "Geminids 2014 ZHR". International Meteor Organization. 20 December 2014.
  22. ^ "Geminids 2015 ZHR". International Meteor Organization. 20 December 2015.
  23. ^ "Geminids 2016 ZHR". International Meteor Organization. 20 December 2016.
  24. ^ Antier, Karl. "Impressive 2017 Geminids!". IMO.
  25. ^ Miskotte, Koen. "The Geminids of 2018: an analysis of visual observations". Meteor News. Archived from the original on 2023-12-01. Retrieved 2021-10-05.
  26. ^ "Geminids 2018 ZHR". International Meteor Organization. 20 December 2018.
  27. ^ "Geminids 2019 ZHR". International Meteor Organization. 20 December 2019.
  28. ^ "Geminids 2020 ZHR". International Meteor Organization. 20 December 2020.
  29. ^ "Geminids 2021 ZHR". International Meteor Organization. 20 December 2021.
  30. ^ "Geminids 2022 ZHR". International Meteor Organization. 20 December 2022.
  31. ^ "Geminids 2023 ZHR". International Meteor Organization. 20 December 2023.
  32. ^ "Viewing the 2024 Geminid Meteor Shower | IMO". 2024-12-14. Retrieved 2025-08-29.
  33. ^ "Geminids 2024 ZHR". International Meteor Organization. 20 December 2024.
  34. ^ "Meteor Shower Calendar | IMO | Page 2025". Retrieved 2025-08-29.
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