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[7298] sigma Sagittarii is the second brightest star in Sagittarius. It is a class B dwarf, about 225 light-years distant. The star is also known as Nunki, a name Babylonians used for the stars they believed represented Eridu, their sacred city.
If you are in the northern hemisphere, compare it with Polaris (magnitude 2.02) to see the relative brightnesses change to the eye caused by of a difference of a full magnitude (if in the southern hemisphere, use Nunki, Sigma Sagittarii, ...
Last, but not least, is Sigma Sagittarii, called Nunki. This name was applied relatively recently by navigators, but it was borrowed from a list of Babylonian star names.
 See also: Sky, Nunki, Light Year, Cluster, Galaxy
  
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