Description

Just over 1.300 light years away this beautiful reflection nebula (also known as Caldwell 4) can be found in the constellation Cepheus.
To be precise, the star cluster inside the nebula is actually known as NGC7023.

The light of the central mag 7 star (SAO 19158) is reflected by a large amount of dust particles still surrounding it.
Supposedly the central star is less than 5000 years old !

Other versions

Previous/older images:

Image data

Object info
Name NGC7023 – The Iris Nebula
Type Reflection nebula
Constellation Cepheus
Right ascension 21h 01m 35s
Declination +68° 10′ 10″
Distance 1.300 ly
Other designations Caldwell 4, LBN487
Image info
Image date Jun. 27, 2011
Light frames 28x 6 min. UHC-S unbinned
Total integration 2h 48m
Dark frames 10x
Flat frames 10x p. filter unbinned, created with an A3 size Posterpoweruk flatfield panel
Bias frames 10x
Software used CCDOps, CCDSoft, ImagesPlus, Photoshop CS4
Processing CCDOPS was used for focussing. Image Acquisition was done using CCDSoft.
All separate frames were calibrated, aligned and stacked in MaxIm DL5 Pro.
Photoshop CS4 was used for further processing – curves adjustment, levels adjustment, etc.
Noel Carboni’s toolset was used as well (Local Contrast Enhancement, Deep Space Noise Reduction).
Equipment info
Telescope TMB/LOMO 80/480
Corrector Televue 2″ TRF 2008 flattener/reducer (FL: 384mm f/4.8)
Mount Losmandy G-11
Camera SBIG ST-8300M
Guide camera Atik 1HS Mono
Guide scope Vixen VMC110L
Autoguide software Guidemaster
Filters Baader 2″ UHC-S
Location Landgraaf, The Netherlands
Image comments

It does not get completely dark at these latitudes at this time of year.
Some halos around brighter stars.