02 August  2017
 M45 - The Pleiades

By   Andrei Bacila

M45 - The Pleiades

The Pleiades (also known as the Seven Sisters) is an open star cluster in the constellation of Taurus and is
 the most visible cluster to the naked eye in the night sky. Located at about 400 light years from Earth is one
of the nearest star cluster. Being so close to Earth, the distance to the cluster can be measured with a high degree of accuracy (in astronomical terms)
and so it is used to calibrate the cosmic distance ladder (one method used by astronomers to determine the distance between celestial objects).
The name of the cluster is said to come from Greek mythology, representing the seven nymph companions of Artemis,
 the daughters of the titan Atlas with the sea-nymph Pleione. In reality, most likely the name of the star cluster came first and the mythological part came later to explain it.

This composition was shot through the course of two nights, cumulating a total integration time of ~10.5 hours.
 It's an LRGB composition shot with the equipment below and processed in PixInsight (the processing part was
a real pain because during the acquisition nights the sky had a light haze that generated some halos around the stars).

Mount: SW AZ-EQ6 GT
Scope: SW ED80 with TeleVue TRF-2008
Camera: Atik Cameras 460ex Mono with EFW2 and Bader LRGB 1.25” filters

Total integration ~10.5 hours:
L: 23x900s @ bin 1x1
R: 20x300s @ bin 2x2
G: 18x300s @ bin 2x2
B: 20x300s @ bin 2x2


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