Northern Hemisphere

this small, unremarkable northern constellation consists of a zigzag of faint stars that fills in the region between Andromeda and Cygnus, squeezed into a narrow space like a lizard between two rocks. its brightest star is Alpha (a) Lacertae, magnitude 3.8. Lacerta is one of the constellations invented in the late 17 th century by the Polish astronomer Johannes hevelius. Although the constellation contains no objects of note for amateur astronomers, it does have one claim to fame, having given its name to a whole new class of galaxies, the so-called BL Lacertae or BL Lac objects.

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