Triangulum is a small constellation in the northern sky. Its name is Latin for triangle, and it should not be confused with Triangulum Australe in the southern sky. Its name derives from its three brightest stars, of third and fourth magnitude, which form a nearly-isosceles long and narrow triangle. Triangulum was one of the 48 constellations listed by the 2nd century astronomer Ptolemy, and remains one of the 88 modern constellations.
Triangulum...
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Triangulum is a small constellation in the northern sky. Its name is Latin for triangle, and it should not be confused with Triangulum Australe in the southern sky. Its name derives from its three brightest stars, of third and fourth magnitude, which form a nearly-isosceles long and narrow triangle. Triangulum was one of the 48 constellations listed by the 2nd century astronomer Ptolemy, and remains one of the 88 modern constellations.
Triangulum has no stars of the first magnitude. Its brightest star is the white giant star β Trianguli (3.00) with a close, dimmer companion. Its second-brightest star, the yellow-white subgiant star α Trianguli (3.41) with a close dimmer companion, is also known as Caput Trianguli, and is at the apex of the triangle. 6 Trianguli, (known in some older sources as ι), is an "attractive double star with a noticeable color contrast" that can be split by medium-sized telescopes into a strong yellow and a pale blue star. Both components are themselves close...
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