Alpha Capricornids

Alpha Capricornids
Celestial map of Capricornus
Discovery date1871
Parent body169P/NEAT
(2002 EX12)[1]
Radiant
ConstellationCapricornus
Right ascension20h 44m 00s
Declination−10° 00′ 00″
Properties
Occurs duringJuly 7 to August 15[2]
Date of peakJuly 31[2]
Velocity23 km/s
Zenithal hourly rate5
See also: List of meteor showers

Alpha Capricornids is a meteor shower that takes place as early as 7 July and continues until around 15 August.[2] The meteor shower was discovered by Hungarian astronomer Miklos von Konkoly-Thege in 1871.[3] This shower has infrequent but relatively bright meteors, with some fireballs. Parent body is comet 169P/NEAT.

Peter Jenniskens and Jeremie Vaubaillon identified the parent body as asteroid 2002 EX12, which in the return of 2005 was found weakly active near perihelion.[1] This object is now called comet 169P/NEAT.

According to Jenniskens and Vaubaillon, the meteor shower was created about 3,500 to 5,000 years ago, when about half of the parent body disintegrated and fell into dust.[1] The dust cloud evolved into Earth's orbit recently, causing a shower with peak rates of 2-5/h, sometimes having outbursts of bright flaring meteors with rates up to 5-9/h.

The bulk of the dust will not be in Earth's path until the 24th century. The Alpha Capricornids are expected to become a major annual storm in 2220–2420 A.D., one that will be "stronger than any current annual shower."[1]

References

  1. ^ a b c d Jenniskens, P.; Vaubaillon, J. (2010). "Minor planet 2002 EX12 ( = 169P/NEAT) and the Alpha Capricornid shower". Astronomical Journal. 139 (5): 1822–1830. Bibcode:2010AJ....139.1822J. doi:10.1088/0004-6256/139/5/1822. S2CID 59523258. Retrieved 8 July 2014.
  2. ^ a b c Robert Lunsford (21 July 2022). "Meteoric Activity for 23-29 July 2022". MeteorNews. Retrieved 21 July 2022.
  3. ^ "Alpha Capricornids: Encyclopedia Article". Encarta.msn.com. Encarta. Archived from the original on 19 April 2009. Retrieved 8 July 2014.

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