BL Lacertae

Details BL Lacertae BL Lacertae

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke2371p&link_type=abstract

"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 2371. Bristol: Institute of Physics Publishing, 2001

Astronomy and Astrophysics

Astrophysics

Galaxies, Active Galaxies, Quasars And Galactic Nuclei

Scientific paper

BL Lacertae (BL Lac or S4 2200+420) was known to be variable in the optical from as early as 1929, and because of its stellar appearance it was originally thought to be a VARIABLE STAR. It is located in the constellation Lacerta, the lizard (RA (J2000)=22h 02' 43.29'', DEC (J2000)=+42° 16' 39.98''). Observations in the late 1960s showed it to have highly variable radio emission as well....

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