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.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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References in periodicals archive ?
17, the Quadrantids will apparently peak at around 2 a.m.
According to the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA), the annual Quadrantid meteor shower will be active until January 7, reaching its peak activity in the early hours of January 4 where meteors or "falling stars" can be seen at the rate of at least 40 meteors per hour.
To find it in the night sky, imagine a triangle formed of Ursa Major, Ursa Minor and the Quadrantid as the bottom point.
Major Meteor Showers in 2016 Morning Radiant Peak rate, ideal Name of peak location conditions * Quadrantids Jan.
SPECTACLE The annual Quadrantid meteor shower pictured in China
JANUARY 4: Earth is at perihelion, the closest point in its orbit to the Sun--specifically, 91,406,752 miles from it; watch for the Quadrantid meteor showers falling at a rate of approximately 25 per hour in the predawn sky.
The Quadrantid meteor shower is an annual event, but its peaks are inconsistent, varying from about 60-200 meteors/hour.
MAJOR METEOR SHOWERS THAT CAN BE SEEN BY THE NAKED EYE NAME DATE RATE PER HOUR Quadrantid Jan 3-4 40-150 Lyrid Apr 21-22 10-15 Perseid Aug 12-13 50-100 Orionid Oct 21-22 10-70 Leonid Nov 16-17 5-20 Geminid Dec 12-14 50-80
KUWAIT, Jan 4 (KUNA) - The Quadrantid meteors to be seen today and tomorrow
Almanac d h Event 01 08:00 Jupiter--Callisto 9.5' 01 08:15 First Quarter 02 22:19 Moon at apogee (404 600 km) 03 01:00 Moon near Jupiter (4.8[degrees]S) 04 09:23 Quadrantid Shower (ZHR = 120) 05 05:59 Earth at perihelion (0.9833 AU) 05 11:17 Moon near Pleiades (3.1[degrees]N) 06 08:00 Moon near Aldebaran (5.8[degrees]S) 06 16:30 Moon at descending node 06 23:46 Moon max.
EST; look for Quadrantid meteors from northeast in hours before dawn (from country locations dozens per hour might be seen); Luna 1 becomes the first spacecraft to escape Earth's gravity, this day in 1959.
(9) If the falling down of meteorites or passing through of meteors (the light phenomenon caused by meteorites; in early texts, liu-hsing [CHINESE TEXT NOT REPRODUCIBLE IN ASCII] seems to be used for both) is more than symbolic, this may be a reference to the Geminid, Ursid, or Quadrantid showers that reach their maxima in mid-December and early January.