Skat – also known by its Greek name Delta Aquarii – ranks as the third-brightest star in the rather dim constellation Aquarius the Water Bearer. The Delta Aquarid meteor shower radiates from a point in the sky near this star, although the meteor shower surely outranks the star in fame. Skat or Delta Aquarii appears modestly bright in a dark country sky. It’s near on the sky’s dome to a very bright star, Fomalhaut in the constellation Piscis Austrinus the Southern Fish. Fomalhaut and the Great Square of Pegasus can help you find Skat. More about that below.
The Delta Aquarids peak in late July and early August, coinciding with the famous August Perseid meteor shower each year. If you watch on a clear dark night, you can see Delta Aquarid meteors streaking along in all parts of the sky. If you trace their paths backward, however, you’ll find that all Delta Aquarids appear to originate from a point near this star.
The point that nearly aligns with the star Skat (Delta Aquarii) is called the radiant point of the Delta Aquarid meteor shower. In actuality, the meteors have nothing whatever to do with this star. The meteors burn up some 100 kilometers (60 miles) above the Earth’s surface, while the star Skat lies about 160 light-years away.
A meteor shower results when the Earth passes through the orbital path of a comet, and the debris from this passing comet vaporizes in the Earth’s upper atmosphere. The meteors enter Earth’s atmosphere on parallel paths. Seeing them come from a radiant point in the sky is much the same illusion as standing on railroad tracks and seeing the tracks converge in the distance.
The Delta Aquarid meteor shower is best in late July and early August. At that time, the star Skat and constellation Aquarius rise above the horizon in the hours between midnight and dawn. They are best seen in the evening sky in the months of October, November, and December. But they are best seen between midnight and dawn during the months of the shower. No matter when you look, you’ll always find Skat to the south (or below) the Great Square of Pegasus and to the north (or above) the bright star Fomalhaut.
Bottom line: The Delta Aquarid meteor shower is named for the star Skat, or Delta Aquarius, third-brightest star in the constellation Aquarius the Water Bearer.