IC 1805, Heart Nebula

About image

IC 1805 (also known as the Heart Nebula or by the acronym W4) is a diffuse nebula associated with an open cluster, visible in the constellation Cassiopeia.
This is a very large HII region, whose distance is estimated at 7500 light years from us; its main characteristic is the presence of two large apparently empty areas of different sizes, which make the nebula similar to a "heart".
Inside there is a system of small, poorly concentrated open clusters, responsible for the ionization of the nebula: the most notable of these is Melotte 15, which contains some stars about 50 times more massive than the Sun.

Technical data
Optic          TS Optics 76 EDPH - Aperture 76mm, focal lenght 342mm, f/4.5
Mount        Skywatcher EQ6R
Camera         ZWO ASI 294MM Pro with external filter wheel 7 positions
Filters         Antlia 36mm RGB, Ha/OIII 3.5nm
Guiding system    Artesky Ultraguide 32mm
Exposure details     R 55x120" bin2 -25C
                                    G 56x120" bin2 -15C
                                    B 44x120" bin2 -15C

          Ha 32x300" bin2 -15C

             OIII 23x300" bin2 -15C

          Gain 120

Total integration  9h45'
Acquisition      Voyager, PHD2
Processing      Pixinsight 1.8, Photoshop CS5, NoiseXTerminator, StarXTerminator, BlurXTerminator
SQM-L       21.05    
Location       Promiod (Aosta Valley, Italy)
Date           7/8 October 2023

© Roberto Marinoni 2019 - All rights reserved