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Contains:  NGC 7023
Getting plate-solving status, please wait...
Iris Nebula in Cepheus, 


            Rudolf Bumm
Iris Nebula in Cepheus
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Iris Nebula in Cepheus

Technical card

Imaging telescopes or lenses:ASA - Astro Systeme Austria Astrograph 203 mm f2.75

Imaging cameras:ZWO ASI1600MMC

Mounts:iOptron CEM60


Dates:June 26, 2017

Frames: 60x180" bin 0x0

Integration: 3.0 hours

Avg. Moon age: 2.74 days

Avg. Moon phase: 8.24%

Basic astrometry details job: 1664098

RA center: 21h 1' 15"

DEC center: +68° 9' 21"

Pixel scale: 1.374 arcsec/pixel

Orientation: 359.924 degrees

Field radius: 1.085 degrees

Resolution: 4512x3462

Locations: Mirasteilas observatory, Falera, Graubünden, Switzerland


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. 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. (wikipedia)

RGB image with the 8' ASA astrograph of Sternwarte Mirasteilas (1288m, Falera, Switzerland) and the ZWO ASI1600mmc. Unfortunately, I overexposed (180 s subs) 2 h of luminance data during the session which I will have to reapeat and maybe add later. Still love this one.

RGB 20 x 180 sec each

Gain 0 offs 21.
auto captured with Sequence Generator Pro
all processing: Pixinsight 1.8. HDR and Deconvolution for core and nebula details. No DBE.
Darks, Flats.



Rudolf Bumm
License: None (All rights reserved)

Sky plot

Sky plot


Iris Nebula in Cepheus, 


            Rudolf Bumm