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Orionids

Orionids (ORI)
The radiant of the Orionids is located about 10 degrees northeast of Betelgeuse[1]
Discovery dateOctober 1839[2]
Parent body1P/Halley[1]
Radiant
ConstellationOrion (10 degrees northeast of Betelgeuse)[1]
Right ascension06h 21m [3]
Declination+15.6°[3]
Properties
Occurs duringOctober 2 – November 7[1]
Date of peakOctober 21[3]
Velocity66.9[4] km/s
Zenithal hourly rate20[5]
See also: List of meteor showers

The Orionids meteor shower, often shortened to the Orionids, is one of two meteor showers associated with Halley's Comet. The Orionids are so-called because the point they appear to come from, called the radiant, lies in the constellation Orion, but they can be seen over a large area of the sky. The Orionids are an annual meteor shower which last approximately one week in late October. In some years, meteors may occur at rates of 50–70 per hour.[6][7]

Orionid outbursts occurred in 585, 930, 1436, 1439, 1465, and 1623.[8] The Orionids occur at the ascending node of Halley's comet. The ascending node reached its closest distance to Earth around 800 BCE. Currently Earth approaches Halley's orbit at a distance of 0.154 AU (23.0 million km; 14.3 million mi; 60 LD) during the Orionids. The next outburst might be in 2070 as a result of particles trapped in a 2:13 MMR with Jupiter.[8]

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  3. ^ a b c Cite error: The named reference AMS2023 was invoked but never defined (see the help page).
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  8. ^ a b Cite error: The named reference Egal2020 was invoked but never defined (see the help page).

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