Circinus

Transit Date of principal star:
3 May

Circinus, The Compass, is a Southern Hemisphere constellation introduced by Nicolas Louis de Lacaille in the mid-eighteenth century. Only seven Bayer stars are brighter than sixth magnitude. Double stars: Alpha Circini is a visual double with faint companion: 3.2, 9; PA 232º, 15.7". Gamma Circini is a very close double of contrasting stars (blue and yellow): 5, 5; PA 49º, separation 0.9" Variable stars: Circinus has two variables among the Bayer stars: Alpha Circini is an alpha CV type variable: 3.18-3.21. Theta Circini is a gamma Cas variable: 5.02-5.44. Deep Sky Objects: Circinus has no deep sky objects of any interest. A printed version of this web site ["The Constellations Pocket Guide"] is available, covering all 88 constellations and their graphics.

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