asterism


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asterism

A prominent grouping of stars forming a distinctive shape but not a complete or recognized constellation. The Plough is an asterism within the constellation Ursa Major. Other examples of asterisms are the Sickle in Leo, the False Cross and the Summer Triangle.

asterism

[′as·tə‚riz·əm]
(astronomy)
A constellation or small group of stars.
(optics)
A starlike optical phenomenon seen in gemstones called star stones; due to reflection of light by lustrous inclusions reduced to sharp lines of light by a domed cabochon style of cutting.
(spectroscopy)
A star-shaped pattern sometimes seen in x-ray spectrophotographs.
References in periodicals archive ?
Calendar asterisms were chosen so that they form opposing pairs (cf.
Asterisms are the beauties of the starry skies, just search them out.
is to be associated with the Warring States asterism Ding [?
The crystals are generally free of feldspar and mica inclusions and display strong asterism (stars).
However, there is a nice asterism of stars to appreciate that forms a triangle with Regulus and the galaxy in the same field of view.
These inclusions produce the effect known as asterism, commonly called stars.
This asterism displays an exquisite and dainty little grouping.
The discovery of Nova Vulpecula followed in 1968, another discovery made in the morning sky, in the distinctive asterism well-known by the appellation of 'The Coathanger'.
TEXT NOT REPRODUCIBLE IN ASCII] Shiji, "Treatise on the Heavenly Offices": "The brightest star of the Pole Star asterism in the Central Palace is the constant abode of the Supreme One.
Deep-sky objects Designation Object type and constellation Messier 99 galaxy in Coma Berenices Coma Cluster open cluster in Coma Berenices NGC 4361 planetary nebula in Corvus Dark Doodad dark nebula in Musca Coal Sack dark nebula in Crux Messier 88 galaxy in Coma Berenices Stargate asterism in Corvus Jewel Box open cluster in Crux Messier 64 galaxy in Coma Berenices NGC 4833 globular cluster in Musca NGC 5189 planetary nebula in Musca
9-4938 is known as an asterism consisting of three magnitude 9 stars slightly more outstanding in a line from north to south.
As with the Orionids, the Leonids are a shower best observed in the post-midnight hours: the radiant, in Leo's 'Sickle' asterism (RA 10h08m, Dec +22[degrees]), rises around 23h local time, and is highest in the sky as dawn approaches.