Leo I (UGC 5470)

An Elliptical Galaxy in Leo

 Leo I is a Local Group Galaxy. It is one of the dwarf speroidal galaxies of the group, and one of the more remote companions of our Milky Way Galaxy. It was discovered in 1950 by R.G. Harrington and A.G. Wilson on plates of the National Geographic Society - Palomar Observatory Sky Survey (POSS) obtained with the 48-inch Schmidt Telescope on Mt. Palomar (Harrington & Wilson 1950), together with another dwarf elliptical galaxy, Leo II.

Because of its apparent proximity to bright first-magnitude Regulus of only about 12 arc minutes, this galaxy is extremely difficult to view visually despite its considerably high total visual brightness of 9.8 magnitudes (photographically 11.2 mag); therefore, it was not detected visually before about 1990.

This image was taken on the night of 4 March 2014 through a William Optics Megrez 90 telescope with a 0.8 x focal reducer through Astrodon RGB filters and using an Atik 460EX mono CCD camera. There were 13 x 300s sub exposures in each of R, G and B.