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IC 1276 - Palomar 7 - a globular cluster in the
constellation of Serpens |
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Object description:
IC 1276
(PAL 7) is a little known small globular cluster
in the constellation Serpens. With an apparent diameter of 7 arcminutes it is
assigned to concentration class XII (little concentrated) according to Shapley.
Its distance to the solar system is given with about 18 000 lightyears. Dust
and dark clouds in front of it not only dim the light of the stars but also
redden it significantly, so that the stars appear yellowish.
Of the 147
known globular clusters in our Galaxy, 108 were already included in the NGC
catalog and thus were discovered visually. Another eight were added later in
the IC catalog. |
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IC
1276 was discovered in 1889 by Lewis Swift. In the early 1950s it was
supposedly "rediscovered" by George Odgen Abell on photographic plates of the
POSS sky survey and got the catalog designation PAL
7 (Palomar 7). Altogether 15 globular clusters got the catalog
designations PAL 1 to PAL 15.
For
the history of the globular clusters brand "Palomar" you can find a detailed
description on the
Website of Wolfgang Steinicke (only available in German
language). There is also a table with detailed data about the Palomar globular
clusters.
« Click here or the thumbnail to load a large annoted image
and a size comparison to the full moon. |
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All Images and all Content are ©
by Franz Hofmann + Wolfgang Paech |