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Astronomical Observatory: Cool Images

Astr110 Photography Projects, Fall 2006

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M92 Globular Cluster , Kori Francis

M92 Globular Cluster

Messier Object M92 is a globular cluster originally found in 1777 by Johann Elert Bode.  It was rediscovered in 1781 by Charles Messier and named as one of the numerous Messier Objects, hence the M.  A Globular Cluster is an older, spherically symmetrical, compact group of up to a million stars that are located in the galactic halo and move in giant and highly eccentric orbits around the galactic center.  M92 is in the constellation Hercules.  Under clear conditions M92 is visible to the naked eye.  In the year 16000 AD this cluster will become a Polarissma Borealis or North Cluster because it will pass within one degree of Earth’s North Celestial Pole.

M92 has a bright center and there are numerous stars around it in all directions.  The cluster itself is quite small.  Its core is the most visible part of it.  M92 has a linear size of 38.63 arc minutes.  Some of this cluster’s outer stars appear more yellow then the others. Thes yellow stars are the older of the cluster.

References:
Fronmert, Hartmut, and Christine Kronberg. "Messier 92." SEDS. SEDS. 16 Nov. 2006 <http://www.seds.org/messier/m/m092.html>.

"globular cluster." Dictionary.com Unabridged (v 1.0.1). Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006. 16 Nov. 2006. <http://dictionary.reference.com/browse/globular%20cluster>

Right Ascension (J2000) 17:17:06
Declination (J2000) +43:08:00
Filters used blue(B), green(V) and red(R)
Exposure time per filter 5x60 seconds in VR, 120 seconds in B
Date observed

October 28, 2006

9:18 to 9:23 PM

 

 

 

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