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Lacerta
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Lacerta

astronomy
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Written by
Erik Gregersen
Erik Gregersen is a senior editor at Encyclopaedia Britannica, specializing in the physical sciences and technology. Before joining Britannica in 2007, he worked at the University of Chicago Press on the...
Erik Gregersen
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Latin:
“Lizard”
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Lacerta, constellation in the northern sky at about 22.5 hours right ascension and 45° north in declination. Its brightest star is Alpha Lacertae, with a magnitude of 3.8. BL Lacertae is the prototype of a class of quasars that are oriented such that their jets are aimed at Earth. Polish astronomer Johann Hevelius invented this constellation in 1687.

Erik Gregersen