Tag Archives: Pleiades

Perseus (A Greek mythological hero)

PerseusCCThe constellation Perseus is located near several other constellations to which Perseus is related in Greek mythology: Cepheus, Andromeda, Pegasus, Cassiopeia, and Cetus. This constellation was one of the 48 constellations cataloged by 2nd century astronomer Ptolemy that remain among the 88 modern constellations. This easily spotted constellation is well placed high in the northern sky and best seen in January. It is found between Cassiopeia and the Pleiades, and Mirfak (Alpha Persei) is its brightest star Its most interesting star Algol (Beta Persei) is an eclipsing binary star. Its variable brightness, which is noticeable to the naked eye, decreases by over one degree of magnitude for about ten hours on a cycle time of just under three days. This star is also known as the Demon Star, because the ancients perceived its variability as an ominous sign. Also notable in this constellation is theNGC869NGC884 Double Cluster (NGC 869 and NGC 884), which are naked eye objects under very dark skies. Perseus is home to two Messier objects, M34 and M76, and to the Perseids meteor shower. This meteor shower, one of the most consistently prominent meteor showers each year, lasts from mid-July to late August, peaking between the 9th and 10th of August.
http://en.wikipedia.org/wiki/Perseus_(constellation)

606px-Perseus_IAU.svg
IAU Perseus chart, IAU and Sky & Telescope magazine (Roger Sinnott and Rick Fienberg), June 5, 2011.

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

Taurus (The bull)

Constellation TaurusTaurus, one of the zodiacal constellations, is most easily identified by it’s distinct and bright V-shaped asterism that represents the face of the bull. Taurus was one of the 48 constellations cataloged by the 2nd century astronomer Ptolemy that remains among the 88 modern constellations. This constellation reaches its highest nightfall ascension in February, and is found by tracing Orion’s belt stars to the right  to Aldebaran (Alpha Tauri), the bright reddish star nearby. The outlying stars in this constellation can be difficult to locate in light polluted skies.

With the exception of the brightest star, Aldebaran, the V-shaped asterism previously mentioned are stars withing the Hyades open star cluster, which is the closest open star cluster to us here on Earth. Many more stars in this cluster can be detected with binoculars or a small telescope. Also in Taurus is the brightest an most distinct open star cluster that we can see from Earth, The Pleiades (M45, or The Seven Sisters), which is located northwest of the V-shaped astersm toward and near Perseus. This open star cluster, sometimes mistakenly thought to be the Little Dipper, becomes even more beautiful with even the slightest magnification. The only other Messier object is M1, the Crab Nebula, which was created by a supernova explosion that was bright enough to be seen in the daytime sky in July of 1054.
http://en.wikipedia.org/wiki/Taurus_(constellation)

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

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