NGC 7023 IRIS NEBULA
| The Iris Nebula, also NGC 7023 and Caldwell 4, is a bright reflection nebula and Caldwell object in the constellation Cepheus. NGC 7023 is actually the cluster within the nebula, LBN 487, and the nebula is lit by a magnitude +7 star, SAO 19158.[1] It shines at magnitude +6.8. It is located near the Mira-type variable star T Cephei, and near the bright magnitude +3.23 variable star Beta Cephei (Alphirk). It lies 1,300 light-years away and is six light-years across. |
| Location | Varia Agrinion, Greece. |
| Date | 1-2/07/2011. |
| Telescope | Sky-Watcher 190mm Mak-Newtonian. |
| Mount | NEQ6-Pro. |
| Camera | QHY8 Colour. |
| Guiding | Finder 8x50+QHY5+PHD 1.12.3 |
| Exposures | RGB 57x10min= 09:30 Hours. |
| Calibration Frames | 40xBIAS,40xFLATS,40XDARK FLATS. |
| Capture | Nebulosity. |
| Stack | Deep Sky Stacker. |
| Processing | Pixinsight 1,6 core, Photoshop, CS5. |