M94 - Galaxy in Canes Venatici

M94 Planewave U16M

M94 - Galaxy in Canes Venatici
Mag 8.2 RA 12:50.9 Dec +41 07' 7x3 arcminutes


Discovered by Pierre Méchain in 1781. Messier 94 (M94, NGC 4736) is a nice spiral galaxy situated in constellation Canes Venatici, and one of the nearer beyond our Local Group of Galaxies.

M94 was discovered by Pierre Méchain on March 22, 1781. Getting the report of his friend, Charles Messier observed it, determined its position and cataloged it on March 24, 1781.

Spiral galaxy M94 was classified Sab because of its extremely bright inner region. This bright circular disk is surrounded by a ring of active star-forming regions, traced by blue young star clusters in color images, which sharply separates it from a much less bright outer ring of an older yellowish stellar population. In the outskirts, this region however ends again in a ring with moderate star formation activity, so that M94 is one of the relatively rare galaxies in which two "waves" of stellar formation can be observed. In very long exposures, a further very faint ring, about 15 arc minutes across, becomes visible, a suggestion of which is visible.

The distance of M94 is not yet well-determined. Tully gives about 14 million light years, Burnham 20, Kenneth Glyn Jones 33 million light years.

Scope: Planewave 12.5" CDK
Camera: Apogee U16M w Astrodon GenII LRGB
Mount: Paramount ME (MKS 5000 upgrade)
Luminance 14x10 min
R/G/B 6/5/4 x 10 min each
Images acquired w TheSkyX Professional and CCD-Commander
Calibration, Alignment and Combines in Maxim
Colour combines, Levels and Curves in PS CC incl GradientXTerminator (in CS4)

Click on the image to see a larger version.

Lucknow, Ontario, Canada
Apr, 2015
Ambient temp 0C; camera temp -20C; No Moon.