The Iris Nebula (also known as NGC 7023 and Caldwell 4) is a bright reflection nebula in the constellation Cepheus. The designation NGC 7023 refers to the open cluster within the larger reflection nebula designated LBN 487.
The nebula, which shines at magnitude +6.8, is illuminated by a magnitude +7.4 star designated SAO 19158. It is located near the Mira-type variable star T Cephei, and near the bright magnitude +3.23 variable star Beta Cephei (Alfirk). It lies 1,300 light-years away and is six light-years across.
Telescope : TS 65 QApo
Mount : Skywatcher AZ-EQ5 GT
Camera : Atik 460 mono
Guiding : Omegon Off-axis guider with Qhy 5IIL
Filters :L,R,G,B total exposure 8 hours & 30 minutes
Programs I have used : PixInsight 1.8.8
Location: Grammatiko, Attiki
Δεν υπάρχουν σχόλια: