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1,301 ± 285 [10] L/T eff: Another red supergiant, Stephenson 2 DFK 1 has an estimated radius of 2,150 R ☉. However, it is potentially not a member of the Stephenson 2 cluster and also has a distance with an uncertainty of ≳50% due to it only being measured with radial velocities. [10] [22] Stephenson 2 DFK 49: 1,300 ± 283 [10] L/T eff
IAU designated constellations in equirectangular projection (epoch B1875.0) In contemporary astronomy, 88 constellations are recognized by the International Astronomical Union (IAU). [1] Each constellation is a region of the sky bordered by arcs of right ascension and declination, together covering the entire celestial sphere. Their boundaries ...
Before Delporte's work, there was no standard list of the boundaries of each constellation. Delporte drew the boundaries along vertical and horizontal lines of right ascension and declination ; however, he did so for the epoch B1875.0 , which means that due to precession of the equinoxes, the borders on a modern star map (e.g., for epoch J2000 ...
Saturn has been a popular planet for stargazers this month as it reached its peak brightness on Aug. 14, but astronomy fans' attention will shift to another easy-to-spot planet later this week.
Based on a view from Earth, one may look towards major constellations for a rough sense of where the borders of the quadrants are: [5] (Note: by drawing a line through the following, one can also approximate the galactic equator.) For 0°, look towards the Sagittarius constellation. (The galactic center) For 90°, look towards the Cygnus ...
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Size (left) and distance (right) of a few well-known galaxies put to scale. The following is a list of notable galaxies.. There are about 51 galaxies in the Local Group (see list of nearest galaxies for a complete list), on the order of 100,000 in the Local Supercluster, and an estimated 100 billion in all of the observable universe.