DSS image of B20
Digitized Sky Survey image of B20, 60' x 60' with north at top and west to the right

DSS image of B20
Overlaid DSS image of B20, 60' x 60' with north at top and west to the right

Type  Dark Nebula
Size  60'
RA (2000)  4h 37'
Dec (2000)  50° 58' N
Constellation  Perseus

Observing Notes

Rev. T.W. Webb
Hardwick, Herefordshire, England (map)

Centre of dark space, extending 5m in R.A. and 1° in Dec., which Es. believes to occupied by a body absorbing the light of the stars. Barnard has found several objects which he believes to be due to an absorption medium, one at 18h7m, S. 18°15' especially remarkable [B92].

E.E. Barnard
25cm f/5 Astrograph

In S part of larger, relatively vacant area nearly 1° in diam. This is the dark object mentioned by Espin in Monthly Notices, 58, 334, 1898. It is close north to a small group of faint stars and is 6' or 8' in diameter. In a somewhat larger vacant space. It is not so definite as B 15.
Other Data Sources for B20
Nearby objects for B20
3 objects found within 120'
B20 Berkeley 67 NGC1624
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.