M 39

About image

M 39 (also known as NGC 7092) is a bright open cluster in the constellation Cygnus.
M39 is located at a distance of approximately 825 light years from Earth, with an age estimated between 230 and 300 million years.
its diameter is about 7 light years and contains at least 30 members brighter than the 11th magnitude.
The 12 brightest stars are all types A and B, spread across a field of over 30'.

I obtained this image from my home terrace, under a very polluted sky due to street light and poor transparency.
Fortunately M 39 is quite high in the sky, so at least the impact of light pollution was quite manageable.

Technical data
Optic         Tecnosky Apo refractor LT 130-910 with Riccardi reducer 0.75x (focal lenght 692mm, f/5.3)
Mount       Skywatcher EQ8
Camera                      Moravian G3-16200 CCD with external filter wheel 7 positions
Filters                         Baader 50mm unmounted RGB
Guiding system         Artesky Ultraguide 70mm 
Exposure details    R 27x300" bin1 -15C

         G 28x300" bin1 -15C
            B 27x300" bin1 -15C                      

Total integration       6h50'
Acquisition                Voyager, PHD2
Processing                Pixinsight 1.8, Photoshop CS5, NoiseXTerminator, BlurXterminator
SQM-L                       18.2    
Location                    Rescaldina (Italy), home terrace
Date                          10/11 September 2023

© Roberto Marinoni 2019 - All rights reserved