Dwarf Spheroidal Galaxy Leo I (UGC 5470, DDO 74, A1006), type dE3,
Regulus Galaxy, Harrington-Wilson 1
Leo I, together with Leo II, was discovered in 1950 by
R.G. Harrington and A.G. Wilson on plates of the National Geographic Society
- Palomar Sky Survey obtained with the 48-inch Schmidt Telescope on
Mt. Palomar (see reference).
According to Wilson (1955), Wilson discovered Leo I
and Harrington discovered Leo II.
- 10 : 08.5
- +12 : 18
- dSph, dE3
- 168 +/- 60 km/s (helio.)
- 900 kly
- Apparent Dimension:
- 9.8 x 7.4 arc min
- 9.8 m_vis, 11.2 m_ph
- Abs. Mag:
This dwarf galaxy was only visually detected by amateurs in the last 15
years because nearby (only about 12 arc minutes) bright (first-magnitude)
Regulus shines this galaxy out despite its rather considerable brightness
of 9.8 mag visually and 11.2 mag photographically.
Our image of Leo I was obtained by David Malin and is copyrighted
© Anglo-Australian Observatory.
More information on this image (David Malin)
Higher-resolution (832x624 pixel) version of this image
Leo Dwarf image by Mel Bartels, obtained with a Hale camera using SITe
512x512 back illuminated chip, 6" f/5, 1 minute exposure (raw image)
Chris Schur's Leo I image -
more information on this image by Chris Schur
More information on Leo I (SEDS Messier Database)
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Last Modification: January 13, 2000