COSMOS-Gr30 is a particularly dense region in space that contains 10 individual galaxies.
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|Area||314 sq. deg. (47th)|
|Stars with planets||5|
|Stars brighter than 3.00m||0|
|Stars within 10.00 pc (32.62 ly)||5|
|Brightest star||α Sex (4.49m)|
|Visible at latitudes between +80° and −90°.|
Best visible at 21:00 (9 p.m.) during the month of April.
Sextans is a minor equatorial constellation which was introduced in 1687 by Johannes Hevelius. Its name is Latin for the astronomical sextant, an instrument that Hevelius made frequent use of in his observations.
Sextans as a constellation covers a rather dim, sparse region of the sky. It has only one star above the fifth magnitude, namely α Sextantis at 4.49m. The constellation contains a few double stars, including γ, 35, and 40 Sextantis. There are a few notable variable stars, including β, 25, 23 Sextantis, and LHS 292. NGC 3115, an edge-on lenticular galaxy, is the only noteworthy deep-sky object. It also lies near the ecliptic, which causes the Moon, and some of the planets to occasionally pass through it for brief periods of time.
In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy (at z = 6.60) found in Sextans. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.
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