-
leading to an
angular diameter (also
called "metric diameter"). The
isophotal diameter is
introduced as a
conventional way of
measuring a galaxy's size...
- by the
naked eye. The
Milky Way is a
barred spiral galaxy with a D25
isophotal diameter estimated at 26.8 ± 1.1 kilop****cs (87,400 ± 3,600 light-years)...
-
either a
planetary nebula or a
peculiar galaxy. The
galaxy has a D25
isophotal diameter of 45.41 kilop****cs (148,000 light-years). A
nearly perfect...
-
lenticular galaxy at the
center of the
Abell 2029
galaxy cluster. It has an
isophotal diameter at
about 123.65 to 169.61 kilop****cs (400,000 to 550,000 light-years)...
- and is
cataloged as
Messier 31, M31, and NGC 224.
Andromeda has a D25
isophotal diameter of
about 46.56 kilop****cs (152,000 light-years) and is approximately...
-
million light-years away in the
constellation Ursa Major. It has a D25
isophotal diameter of 29.44 kilop****cs (96,000 light-years).
Because of its relative...
-
constellation Triangulum. It is
catalogued as
Messier 33 or NGC 598. With the D25
isophotal diameter of 18.74 kilop****cs (61,100 light-years), the
Triangulum Galaxy...
-
ultraviolet light of over 522,000 light-years (160,000 pc), and a D25.5
isophotal diameter of over 717,000 light-years (220,000 pc),
making it the largest...
-
spiral galaxies in the sky, and is
visible with binoculars. It has an
isophotal diameter at
about 36.24 kilop****cs (118,000 light-years). Its nickname...
- has an
angular diameter of 16.20 arcseconds,
corresponding to a
large isophotal diameter of 206.1 kilop****cs (672,200 light-years),
making it one of...
