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Markarian 421

Blazar located in the constellation Ursa Major

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Sloan Digital Sky Survey image of blazar Markarian 421.
Sloan Digital Sky Survey · CC BY 4.0

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It was first determined to be a very high energy gamma ray emitter in 1992 by M. Punch at the Whipple Observatory, and an extremely rapid outburst in very-high-energy gamma rays (15-minute rise-time) was measured in 1996 by J. Gaidos at Whipple Observatory.

Markarian 421 also had an outburst in 2001 and is monitored by the Whole Earth Blazar Telescope project.

Due to its brightness (around 13.3 magnitude, max. 11.6 mag. and min. 16 mag.) the object can also be viewed by amateurs in smaller telescopes.

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