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Caldwell 25 (NGC 2419)
Jane Lee

Globular Cluster

This star is a globular cluster, which is a concentration of stars that contain thousands of stars in it. They are usually extremely old stars and the distance across the cluster is about a hundred light years across. Globular clusters are in a spherically shape because they are bound very tightly by gravity. The brighter it is towards the center, the more denser the cluster is. They are also found in the halo of galaxies. In the Milky Way galaxy, there has been about 140 clusters discovered.

The star in the picture above is called Caldwell25. The cluster is very dense in the center because the level of its brightness compared to the surrounding stars. We can also see slight shades of orangish-reddish stars in the cluster. The redder the star, the colder they are, whereas if the star is more blue, they are likely to be more hotter. The Caldwell 25 is 260 light years across standing 157 light years away from our planet.

 

References:

Atlas of the Universe <http://www.atlasoftheuniverse.com/globular.html>

 

Right Ascension (J2000) 07:38:08.50
Declination (J2000) +38:52:57
Filters used B (Blue), C (Clear), R (Red), V (Green)
Exposure time per filter B, V, and R (300s); C (60s x 5)
Date observed October 23rd, 2012

 

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