M51, Palomar
Name: M51
Alternative name: Whirlpool galaxy
Constellation: Canes Venatici
RA: 13h 29m 56s
Dec: +47d 13m 53s
Distance: 40 million light years
Object type: Double galaxy
Size: 9 arcminutes
Apparent magnitude: 8.5
Notes: The image on the left shows M51 as seen by the 60-inch telescope on Mount Palomar in California. The image was taken through a filter centered on 365 nanometres which is at the red end of the visible part of the electromagnetic spectrum. M51 is a face-on double galaxy. The larger of the two galaxies is a spiral and is interacting with its smaller companion.

Image credit: Palomar