Messier 45 wide field in Taurus
Exposure time total:
Sigma Art 135mm F1.8 DG HSM @ f/2.8
10micron GM1000 HPS
23x2 min ISO 400
Image acquisition by CEDIC team
(Christoph Kaltseis, Bernhard Hubl, Markus Blauensteiner)
Image processing by Christoph Kaltseis
Open star cluster (I3r) with reflection nebula
The Pleiades nebulae are blue-colored, which indicates that they are
reflection nebulae, reflecting the light of the bright stars situated near
(or within) them. Physically, the reflection nebula is probably
part of the dust in a molecular cloud, unrelated to the Pleiades cluster,
which happens to cross the cluster's way.
It is not a remainder of the nebula from which the cluster once formed.