Celestial hemisphere:  Northern  ·  Constellation: Cepheus (Cep)  ·  Contains:  HD200775  ·  Iris Nebula  ·  LBN 487  ·  LDN 1174  ·  NGC 7023
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ngc 7023 of 7th and 12th june 2022 - 537 60 secs unguided subs, Stefano Ciapetti
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ngc 7023 of 7th and 12th june 2022 - 537 60 secs unguided subs

Getting plate-solving status, please wait...
ngc 7023 of 7th and 12th june 2022 - 537 60 secs unguided subs, Stefano Ciapetti
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ngc 7023 of 7th and 12th june 2022 - 537 60 secs unguided subs

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Description

This image is the sum of 537 60 secs unguided subs taken during the nights of the 7th and 12th June 2022 with a Newton Orion USA 250 F 3.9 + Omegon Coma Corrector + QHY268M + Primalucelab UHC filter on top of a Ioptron Smart EQ. 8 Flats applied
Aquisition, stacking and processing with Astroart 8 (gradient removal, DDP, deconvultion to correct stars elongation, stars compression).
I have manually removed all the images with satellites (around 30 in 2 nights) but I have not been able to remove an annoying horizontal dark lane. Mystery. Maybe I have to test some other stacking software or going to PS.

The Iris Nebula (also known as NGC 7023 and Caldwell 4) is a bright reflection nebula in the constellation Cepheus. The designation NGC 7023 refers to the open cluster within the larger reflection nebula designated LBN 487.

The nebula, which shines at magnitude +6.8, is illuminated by a magnitude +7.4 star designated SAO 19158. It is located near the Mira-type variable star T Cephei, and near the bright magnitude +3.23 variable star Beta Cephei (Alfirk). It lies 1,300 light-years away and is six light-years across. (Wikipedia)

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  • ngc 7023 of 7th and 12th june 2022 - 537 60 secs unguided subs, Stefano Ciapetti
    Original
  • Final
    ngc 7023 of 7th and 12th june 2022 - 537 60 secs unguided subs, Stefano Ciapetti
    B

B

Description: added color information coming from 167 x 120 secs subs taken during the same nights with a C5 + F 6.3 reducer + moddied Nikon d5600 and from several others old images

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ngc 7023 of 7th and 12th june 2022 - 537 60 secs unguided subs, Stefano Ciapetti