M 46

About image

M 46 is a rich open star cluster in Puppis constellation.

Inside the cluster it is visible a small planetary nebula, NGC 2438: but in reality this is only for a perspective effect, because M46 has a distance of 5400 light years, while NGC 2438 has a distance of 2900 light years.

On the image it is visible also another very faint planetary nebula, PK 231+4.1, with magnitude 14.4: you can see it as a little disk at about the half distance between NGC 2438 and the right side of the image.

Technical data

Optic         Tecnosky Apo Refractor LT 130 - 910mm f/7
Mount       10Micron GM2000 HPSII
Camera          Moravian G3-16200 with external filter wheel 7 positions
Filters        Baader RGB 50.8 unmounted
Guiding system      OAG Moravian M68 with guide camera Moravian G1-0301
Exposure details    R 8x300" bin1 -20C
               G 8x300" bin1 -20C
               B 8x300" bin1 -20C
Total integration    2h
Acquisition        Voyager, PHD2
Processing        Pixinsight 1.8, Photoshop CS5
SQM-L         21.00    
Location         Promiod (Aosta Valley, Italy), own remote observatory
Date             12 January 2018

© Roberto Marinoni 2019 - All rights reserved