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Astr111 Photography Projects, Fall 2009

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M45, Andrew Springer


This is one of the set of stars known at one time as the "Seven Sisters". It is one of the most visible clusters in the sky. This set of star's technical name is Pleiades Cluster. The Reflection nebula behind this cluster of stars is probably dust from a molecular cloud. This Cluster of Stars was known in 750 B.C., and it has been referenced ever since. It is a beautiful cluster, and this beauty may be why it was referenced to God's glory in the Bible. It was not documented who found it because it is visible to the human eye. It is mentioned by Homer, Amos, and Hesiod. In those days people only thought it was a cluster of seven stars, but due to telescopes we now know that there are many more then seven stars in this cluster. It is believed to be mentioned in the book of Amos chapter 5 verse 8. the Cluster is visible with the naked eye.

This image in particular is of the bottom right star out of the cluster. the nebula reflects blue from the the star, and looks very beautiful because the reflection. The star system Pleiades has many stars, and they all burn blue. Blue and white are the colors of the hottest stars. These stars are very far away. The Pleiades Cluster is 440 light years away. It is also .172 light years across. Because these stars are blue, that means that the cluster is very young. Stars that burn blue exist for much less time then a star that burns red or yellow. The dust around it is also evidence that it is young. M45 is a beautiful cluster of stars, and It will be enjoyed for millions of years to come.



Frommert, Hartmut and Kronberg, Christine. "Messier-45." Students for the Exploration and Development of Space.


Nemiroff, Robert and Bonnell, Jerry "Astronomy Picture of the Day"


Right Ascension (J2000) 3:46:56
Declination (J2000) +23:58:51
Filters used blue(B), green(V), and red(R)
Exposure time per filter 20 x 10 sec B, 20 x 5 sec V/R
Date observed

November 7, 2009(BVR)