Spring Triangle

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The Spring Triangle with Arcturus, Spica, and Regulus plus (May 2017) Jupiter and, "incidentally", the Moon. The line between Spica and Regulus nearly represents the ecliptic, the path of the sun and planets. Arcturus and Spica are found along an arcing path off the handle of the big dipper, while Regulus can also be found from the big dipper by pointing from down from the third and fourth dipper stars.

The Spring Triangle is an astronomical asterism involving an imaginary triangle drawn upon the celestial sphere, with its defining vertices at Arcturus, Spica, and Regulus. This triangle connects the constellations of Boötes, Virgo, and Leo. It is visible rising in the south eastern sky of the northern hemisphere between March and May.

George Lovi of Sky & Telescope magazine had a slightly different Spring triangle, including the tail of Leo, Denebola, instead of Regulus. Denebola is dimmer, but the triangle is more nearly equilateral.[1]

These stars forms part of a larger Spring asterism called the Great Diamond together with Cor Caroli.

The stars of the Spring Triangle[edit]

Constellation Name Apparent magnitude Luminosity
(× solar)
Spectral type Distance
(light years)
Boötes Arcturus −0.04 176 K1.5 36.7
Virgo Spica 1.04 12100 B1 260
Leo Regulus 1.35 288 B7 79.3
Denebola 2.11 15 A3 35.9

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