Messier 77 (also known as ) is a NGC 1068 barred spiral galaxy about 47 million light-years away in the constellation Cetus. Messier 77 is an active galaxy with an Active Galactic Nucleus (AGN), which is obscured from view by astronomical dust at visible wavelengths. The diameter of the molecular disk and hot plasma associated with the obscuring material was first measured at radio wavelengths by the VLBA and VLA. The hot dust around the nucleus was subsequently measured in the mid-infrared by the MIDI instrument at the VLTI. It is the brightest [3 ] Seyfert galaxy and is of type 2. [2 ]
Messier 77's diameter is 170,000 light-years.
M77 with amateur telescope.
Messier 77 (M77) barred spiral galaxy. Courtesy: Joseph D. Schulman
History [ edit ]
Messier 77 was discovered by
Pierre Méchain in 1780, who originally described it as a nebula. Méchain then communicated his discovery to Charles Messier, who subsequently listed the object in his catalog. Both Messier and [4 ] William Herschel described this galaxy as a star cluster. Today, however, the object is known to be a galaxy. [4 ]
X-ray source [ edit ]
X-ray source 1H 0244+001 in Cetus has been identified as Messier 77 (NGC 1068, M77).
References [ edit ]
External links [ edit ]
Wikimedia Commons has media related to
. Messier 77
Messier 77 on
WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
"StarDate: M77 Fact Sheet"
Spiral Galaxy M77 @ SEDS Messier pages
VLBA image of the month: radio continuum and water masers of NGC 1068
Press release about VLTI observations of NGC 1068
Gray, Meghan; Hardy, Liam. "M77 – Globular Cluster". Deep Space Videos. Brady Haran.
APOD image of Messier 77 - May 10, 2013
Coordinates: 02 h 42 m 40.7 s, −00° 00′ 48″