06  September  2017
M45 Pleiades or Seven Sister

By  Luis Romero Ventura
www.astrosirius.org )

In astronomy, the Pleiades or Seven Sisters (Messier 45 or M45), is an open star cluster containing middle-aged,
hot B-type stars located in the constellation of Taurus. It is among the nearest star clusters
to Earth and is the cluster most obvious to the naked eye in the night sky. The celestial entity has several meanings in different cultures and traditions.

The cluster is dominated by hot blue and extremely luminous stars that have formed within the last 100 million years.
Dust that forms a faint reflection nebulosity around the brightest stars was thought at first to be left over from the formation
of the cluster (hence the alternative name Maia Nebula after the star Maia), but is now known to be an unrelated dust cloud in
the interstellar medium, through which the stars are currently passing. Computer simulations have shown that the Pleiades was probably formed
from a compact configuration that resembled the Orion Nebula.  Astronomers estimate
 that the cluster will survive for about another 250 million years,
after which it will disperse due to gravitational interactions with its galactic neighborhood.

Source: Wikipedia

About this Image:

Location: Àger-Lleida-Spain
Dates: 18-19-23 December 2016
Average SQM: 21.4-21.6
Telescope: GSO RC14” Truss f8
Camera: Moravian G3-11000 classe 2
Focuser: Feather Touch 3” Kit boss II
Flattener: TSFlattener 2.5”
Filters: Astrodon LRGB Gen2 I-Series True-Balance
Exposures: L:18x300 sec bin1 // R:G:B: 10:10:10 sec x 300 sec bin1 & R:G:B: 15:15:15 sec x 600 sec bin1
Total Exposure: 11.5 hours
Processing: Pixinsight y Photoshop CC 2017.


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