Tag Archives: Great Square of Pegasus

Pisces (The fishes)

Constellation PiscesThis zodiacal constellation is a rather dim grouping of stars that are strung out low across the southern sky, just below the Great Square of Pegasus. Pisces is one of the 48 constellations cataloged by the 2nd century astronomer Ptolemy that remain among the 88 modern constellations. It is highest in the sky and best observed at nightfall in December. The intersection of the ecliptic and the celestial equator lie within this constellation. There are two such intersections that mark the two equinoxes. At the intersection in Pisces, the Sun is moving from south to north, so this is the point of the Vernal (spring) Equinox. This constellation is home to just one Messier object, M74.
http://en.wikipedia.org/wiki/Pisces_(constellation)

IAU Pisces chart, IAU and Sky & Telescope magazine (Roger Sinnott & Rick Fienberg), June 5, 2011

© James R. Johnson, 2014
jim@jrjohnson.net

Aquarius (The water bearer)

Constellation AquariusAquarius, the water bearer, is a rather dim and nondescript zodiacal constellation. This southern constellation was cataloged by 2nd century astronomer Ptolemy. It is located in a region known to  the ancients as “the sea” because several water constellations, to include Capricornus (the sea goat), Piscis Austrinis (the fish), Pisces (the fishes), and Cetus (the sea monster) are gathered there. It is situated on the ecliptic between Capricornus and Pisces, and is just south of the Great Square of Pegasus. Aquarius reaches its highest nightfall ascension in November. Three globular star clusters, M2, M72 and M73 are the only Messier objects found in this constellation. The Eta Aquariids is the strongest meteor shower radiating from Aquarius, peaking at about 35 meteors per hour between May 5th and 6th.
http://en.wikipedia.org/wiki/Aquarius_(constellation)

IAU Aquarius chart, Sky & Telescope magazine (Roger Sinnott and Rick Fienberg), January 27, 1997.
IAU Aquarius chart, Sky & Telescope magazine (Roger Sinnott and Rick Fienberg), January 27, 1997.

© James R. Johnson, 2014.
jim@jrjohnson.net

Andromeda (Cassiopeia’s daughter)

Andromeda, CassiopeiaAndromeda, the mythological daughter of Cepheus and Cassiopeia, is located near these two constellations and among several other constellations representing the Perseus myth, to include Perseus, Pegasus, and Cetus. It is one of the 48 constellations cataloged by 2nd century astronomer Ptolemy that remain among the 88 modern constellations. It is found directly overhead at the zenith after sunset in December. Although Andromeda is not a very distinct constellation in light-polluted skies, most of its stars can be observed. It’s brightest star, Alpheratz (Alpha Andromeda), is shared with the constellation Pegasus, and marks one corner of the Great Square of Pegasus. Locate this constellation by starting with the north eastern most star of the Great Square of Pegasus, and find the remaining stars flowing north east from there.

The Andromeda Galaxy (M31), M31boboThe Milky Way’s closest galactic neighbor, is found in this constellation. M31 can be found with the unaided eye in the very darkest of dark skies, but can easily be found with a binocular or telescope under most adverse light pollution conditions. M31 and M110 are two of M31’s dwarf companion galaxies that can also be seen in most photographs of M31.
http://en.wikipedia.org/wiki/Andromeda_(constellation)

IAU Andromeda chart, IAU and Sky & Telescope magazine (Roger Sinnott and Rick Fienberg), June 4, 2011.
IAU Andromeda chart, IAU and Sky & Telescope magazine (Roger Sinnott and Rick Fienberg), June 4, 2011.

© James R. Johnson, 2014
jim@jrjohnson.net

Pegasus (A winged horse in Greek mythology)

PegasusThis is a rather bright constellation that is nearly straight overhead at nightfall in November. An imaginary line drawn from Polaris through Cassiopeia to just beyond the zenith brings the viewer to this constellation. The most notable feature of this constellation is not an obvious winged horse, but an asterism known as the Great Square of Pegasus. An inexperienced observer who is accustomed to smaller constellations with denser star groupings might have difficulty perceiving these four widely spaced stars as a square. As the square’s stars are rather bright, and present an almost perfect quadrangle, it tends to be easier to relocate for an observer who has previously spotted this constellation and knows what to expect. The globular star cluster, M15, is the only Messier object in this constellation.
http://en.wikipedia.org/wiki/Pegasus_(constellation)

IAU Pegasus chart, Sky  Telescope magazine Roger Sinnott and Rick Fienberg), June 5, 2011.
IAU Pegasus chart, Sky Telescope magazine (Roger Sinnott and Rick Fienberg), June 5, 2011.

© James R. Johnson, 2014.
jim@jrjohnson.net

Capricornus (The sea goat)

Constellation CapricornusCapricornus, the sea goat, is a zodiacal constellation and one of the 48 constellations cataloged by Ptolemy in the 2nd century. It is located on the ecliptic between Sagittarius and Aquarius, and is south of the Summer Triangle and the Great square of Pegasus.  Capricornus reaches its highest nightfall ascension in October. Its alpha star, Deneb Algedi (Delta Capricorni), is just brighter than magnitude 3, and can be seen under most reasonable conditions. The remainder of the constellation is rather dim and difficult to see in light-polluted urban skies. The globular star cluster, M30, is the only Messier object in this constellation.
http://en.wikipedia.org/wiki/Capricornus

IAU Capricornus chart, Sky & Telescope magazine (Roger Sinnott and Rick Fienberg), June 4, 2011.
IAU Capricornus chart, Sky & Telescope magazine (Roger Sinnott and Rick Fienberg), June 4, 2011.

© James R. Johnson, 2014.
jim@jrjohnson.net