Celestial hemisphere:  Northern  ·  Constellation: Cepheus (Cep)  ·  Contains:  Iris Nebula  ·  NGC 7023  ·  VdB139
Iris Nebula (NGC 7023, Caldwell 4), dswtan
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Iris Nebula (NGC 7023, Caldwell 4)

Iris Nebula (NGC 7023, Caldwell 4), dswtan
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Iris Nebula (NGC 7023, Caldwell 4)

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Description

Pretty much my first acceptable LRGB image! Doing flats now, though had to manually patch a massive dust spot (?), and cropped to avoid some longstanding intrusion from the OAG that I need to fix. Lots of walking noise in the dark nebula, but perhaps fixable with additional effort in due course -- I *am* dithering. Not bad for the much-maligned first generation ZWO LRGB filters and older 1600MM camera. I expected more "halo" problems or from the microlensing on this camera. Maybe no need to upgrade after all...

RGB: 40x 60s 139g 40o 0c

L: 60x 60s 1`39g 40o 0c

20 flats/darkflats each filter, 30 darks

https://en.wikipedia.org/wiki/Iris_Nebula

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Iris Nebula (NGC 7023, Caldwell 4), dswtan

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Cloudy Nights