M40 - M40
DSS image of M40
Digitized Sky Survey image of M40, 30' x 30' with north at top and west to the right

DSS image of M40
Overlaid DSS image of M40, 30' x 30' with north at top and west to the right

Type  Double Star
Magnitude  8.4
Size  0.8'
RA (2000)  12h 22' 16.1"
Dec (2000)  58° 5' 4" N
Constellation  Ursa Major

Observing Notes

Andrew Cooper
13 Jun 1998 Pinal Peak, AZ (map)
20cm f/10 SCT

Conformed with finder chart from Burhnam's then located NGC4290 nearby, the galaxy is just on the edge of the 8"" capability

William Herschel
5 Aug 1799

Not visible in the finder.

Charles Messier
24 Oct 1764

[1780 and 1781] Two stars very close together & very small, placed at the root of the tail of the Great Bear: One has difficulty to distinguish them with an ordinary telescope of 6 feet. While searching for the nebula above the back of Ursa Major, reported in the book Figures des Astres, and which is supposed to be for 1660 at 183d 32' 41"" right ascension, & 60d 20' 33"" northern declination, which Messier couldn't see, he has observed these two stars.[1780 and 1781] Two stars very close together & very small, placed at the root of the tail of the Great Bear: One has difficulty to distinguish them with an ordinary telescope of 6 feet. While searching for the nebula above the back of Ursa Major, reported in the book Figures des Astres, and which is supposed to be for 1660 at 183d 32' 41"" right ascension, & 60d 20' 33"" northern declination, which Messier couldn't see, he has observed these two stars. "
Other Data Sources for M40
Nearby objects for M40
Acknowledgements and Credits...

Drawings, descriptions and CCD photos are copyright Andrew Cooper unless otherwise noted, no usage without permission. Use for non-profit and educational reasons is generally given on request.

Positional and some physical information is from the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.

Additional object data from the SIMBAD database, operated at CDS, Strasbourg, France.

The Digitized Sky Survey was produced at the Space Telescope Science Institute under U.S. Government grant NAG W-2166. The images of these surveys are based on photographic data obtained using the Oschin Schmidt Telescope on Palomar Mountain and the UK Schmidt Telescope.

Dark nebulae data from E.E. Barnard, A Photographic Atlas of Selected Regions of the Milky Way. Ed. Edwin B. Frost and Mary R. Calvert. Carnegie Institution of Washington, 1927

Object descriptions of Rev. Webb from Celestial Objects for Common Telescopes sixth edition, Rev. T.W. Webb, 1917, edited by Rev T.E.Espin.