Quadrantids

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Quadrantids

(kwod-ran -tidz) A major meteor shower, radiant: RA 232°, dec +50°, that maximizes on Jan. 3 when the Sun's longitude is 282.8°. The zenithal hourly rate (ZHR) at maximum is about 90 and is constant from year to year. The meteoroid stream is narrow, the ZHR being greater than half maximum for only 17 hours: the stream's cross-sectional diameter is about 1.7 million km compared with 20 million and 13 million km for those of the Perseids and Geminids. The stream has its ascending node close to the orbit of Jupiter. Owing to gravitational and radiational perturbations the large ‘visual’ meteoroids are in a slightly different orbit to the smaller ‘radio’ meteoroids. The shower is thought to be associated with comet Machholz. It is named after the obsolete constellation Quadrans Murali found in early 19th-century star atlases. The radiant is actually in Boötes.

Quadrantids

 

a meteor shower with a radiant on the boundary between the constellations Bootes and Draco (on star maps in the early 19th century this region was designated by the constellation Qudrans Muralis). The Quadrantids have been known since 1839. They are observed annually at the end of December and in the beginning of January; on January 3–4, the earth passes through the dense central concentration of the Quadrantid meteor swarm in less than 24 hr. The Quadrantid meteor shower is one of the more active showers.

Quadrantids

[kwä′dran·tidz]
(astronomy)
A meteor shower whose radiant-right ascension of 15 hours and declination of +48° is in the constellation Boötes; velocity is 27 miles (43 kilometers) per second, and the strength is medium.
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References in periodicals archive ?
The Quadrantids are a major shower, Al-Saadoon told KUNA, adding that they
Scientists suspect that the meteors of the Quadrantids are debris from the asteroid 2003 EH1 - the same source of the Geminid meteor shower every December.
Visual observations analysed by the Director show that the Quadrantid ZHR rose steadily from 35 m/h at 00h on January 4, to 45 m/h by 02h, 55 m/h by 04:00, 65 m/h by 05:30, and peaked at about 75 m/h by 06:30.
Washington, Jan 4 (ANI): The Quadrantid meteor shower, the first of 2012, will peak at 3 am Eastern time on Wednesday, after the moon sets.
Observers who ventured out in early January to monitor the activity of the Quadrantid meteors, one of the three most active regular annual showers, were rewarded with a good display this year.
Instead, Jenniskens discovered a dormant comet in the Quadrantid meteor shower in 2003 and has since identified a number of other such parent bodies.
If you happen to miss the ball drop in Times Square on New Year's Eve, you can start 2013 off right with another light show -- the Quadrantid meteor shower.
His focus remained on meteor work, which he pursued with great dedication, for example, clocking-up a total observing time during a Quadrantid meteor watch one January night in 1951 of 10 hours 48 minutes.
The Quadrantid radiant (RA 15h 28m, Dec +50[degrees]) actually lies in northern Bootes, and from the latitudes of the British Isles it is circumpolar.
As well as providing a general guide to the night sky, the programmes will feature Jupiter and Uranus, the Quadrantid meteor shower which peaks on the night of January 3/4, and the partial solar eclipse on the morning of January 4.
The moon will still be dark as the Quadrantid meteors fall during the first week of January.
The Quadrantid meteors fall every night during the first week of