Alpha Capricornids

Alpha Capricornids is a meteor shower that takes place as early as 15 July and continues until around 10 August.[1] The meteor shower was discovered by Hungarian astronomer Miklos von Konkoly-Thege in 1871. This shower has infrequent but relatively bright meteors, with some fireballs. Parent body is comet 169P/NEAT.

Alpha Capricornids
Celestial map of Capricornus
Discovery date1871
Parent body169P/NEAT
(Minor planet 2002 EX12)
Radiant
ConstellationCapricornus
Right ascension 20h 44m 00s
Declination−10° 00′ 00″
Properties
Occurs during15 July to 10 August
Date of peak29 July
Velocity23 km/s km/s
Zenithal hourly rate5

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.[2] 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.[2] 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."[2]

Notes
  1. "Alpha Capricornids: Encyclopedia Article". Encarta.msn.com. Encarta. Archived from the original on 19 April 2009. Retrieved 8 July 2014.
  2. "Minor planet 2002 EX12 ( = 169P/NEAT) and the Alpha Capricornid shower". Astronomical Journal. Retrieved 8 July 2014. Minor planet 2002 EX12 ... is identified as the parent body of the alpha Capricornid shower, based on a good agreement in the calculated and observed direction and speed of the approaching meteoroids for ejecta 4500-5000 years ago....The bulk of this matter still passes inside Earth's orbit, but will cross Earth's orbit 300 years from now. As a result, the alpha Capricornids are expected to become a major annual shower in 2220-2420 A.D., stronger than any current annual shower
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.