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Atrial fibrillation is a cardiac arrhythmia that involves the two upper chambers of the heart.

ATRIA (Alpha Trianguli Australis). Among the easiest constellations to invent are simple triangles. There are two of them, one north (Triangulum) and one far south (Triangulum Australe).

Atria is an orangish K2IIb-IIIa subgiant to giant. The Visual Magnitude and distance imply a luminosity about 2000 times that of the sun.
Other Designations For This Star
Flamsteed ...

Alpha Trianguli Australis
Greek/English: combination of alpha and triangle ...

Mothallah; Atria; Caput Trianguli; Ras al Muthallah; Elmuthalleth.
Alpha Trianguli
HR 544
HD 11443 ...

Acrux (α Cru), Atria (α TrA), Gacrux (γ Cru), Hadar (Agena, β Cen), Miaplacidus (β Car), Mimosa (Becrux, β Cru), Rigil Kentaurus (Toliman, α Cen), Scutulum (or Aspidiske, ι Car).

Its Alpha star is sometimes known as Atria. Despite lying mostly in the Milky Way, it is remarkably impoverished in deep sky objects.

Catheter Ablation for Atrial...
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The brightest star in the constellation is [8230] alpha Trianguli Australis, also known as Atria, which is just a contraction of its designation. It is an orange bright giant 415 light-years distant and a suspected binary star.

The three main stars of Triangulum Australe are brighter than those of their northern counterpart, although the constellation is smaller. Navigators have named its brightest star Atria, a contraction of its scientific name Alpha Trianguli Australis.

Sco Scorpius Scorpion Antares Scl Sculptor Sculptor's Apparatus Sct Scutum Shield Ser Serpens Serpens Unuk Sex Sextans Sextant Tau Taurus Bull Aldebaran Tel Telescopium Telescope TrA Triangulum Australis Southern Triangle Ras al Muthallath (Atria) ...

See also: See also: Triangulum, Constellation, Triangulum Australe, Star, Sky

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