Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke5291.&link_type=abstract
"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 5291. Bristol: Institute of Physics Publishing, 2001
Astronomy and Astrophysics
Astrophysics
Interstellar Medium, Interstellar Medium Objects
Scientific paper
A planetary nebula in the constellation Draco, position RA 17 h 58.6 m, dec. +66° 38.0', named for its oval shape and greenish color. It is about 20'' in diameter, and of ninth magnitude; the central star is tenth magnitude. William Huggins' spectroscopic observation of the Cat's Eye in 1864, revealing a spectrum consisting of three bright lines, provided proof that not all `nebulae' consist of s...
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