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Object Information
| Description | wikipedia: "The Iris Nebula, also known as 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. 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." |
| Type | Reflection Nebula |
| Brightness | 6.8 mag (vis) |
| Apparent Size | 18' x 18' |
| Distance | 0.0013 MLy |
Exposure Information
| Date | 2017-10-04 |
| Location | Emberger Alm (Austria) 2017 |
| Optics | GSO 6" Ritchey Chretien f11 |
| Camera | ASI 1600MMCool |
| Integration | LRGB each 7 x 300 sec. (2x2 binning) and 0.67x Reducer. (2.33 h total) |
| Image remarks | ITT |