Derby and District Astronomical Society

IC 1805
The Heart Nebula

Emission Nebula in Cassiopeia      RA 02h 32m 42s  Dec +61° 27m 00s

The following two images of the Heart Nebula were created with data taken by Chris Callaway on the 3rd and 6th February 2020 from Coalville. The images comprise 10 x 10min subs of Ha, and 12 x 10min subs of Sii and Oiii. Equipment was a Takahashi 106, the camera was an Atik 16200 with Atik filter wheel and filters, the mount was a Paramount MyT. The images were stacked in Astroart, PixInsight was used for Dynamic Background Extraction and SC Noise Reduction with further processing taking place in Photoshop. In the top image Ha was assigned to the red channel, Oiii to the green channel and Sii to the blue channel. The second image uses exactly the same data as the top image but with Sii assigned to Red, Ha to Green and Oiii to blue. The levels of the individual Red, Green and Blue channels were then stretched to roughly the same size from dark to light before manipulating the colours to create the Hubble palette.  Image © Chris Callaway.

The following image of the Heart Nebula was acquired by Adrian Brown over several nights during August, September, October and November 2007. To cover the whole nebula Adrian needed to shoot a 9 panel mosaic with his 80ED refractor and ATK16HR CCD camera. The image is comprised of 64 x 30 minute exposures distributed over 9 panels. The equipment used was an Astronomik 6nm Hydrogen-Alpha filter, ATIK ATK16HR camera, Skywatcher 80ED Pro refractor, Celestron CGE EQ Mount, Skywatcher 80T guidescope, and an ATIK ATK-2HS guide camera. The raw images were aligned and stacked in Maxim DL 4.53, the mosaic panels aligned in Registar 1.0 and the mosaic assembled in Maxim DL 4.53 and processed in Photoshop CS2. For a full resolution version of the image click here.  Image © Adrian Brown.

Adrian Brown took the following images of the emission nebula IC 1805 in Cassiopeia. He used a Borg 45ED refractor. The colour image is a false colour composite created from data taken with taken with an Astronomik 13nm hydrogen-alpha filter and and an Astronomik 13nm OIII filter. The 60 minutes of hydrogen-alpha data was assigned to the red channel, 25 minutes of OIII data was assigned to the blue channel and a synthetic green channel was created from the combined hydrogen-alpha and OIII data. The yellow colour to represents ionisation fronts in the nebula where hot gas is slamming into the interstellar medium. The monochrome image is comprised of four 15 minute exposures taken with the hydrogen alpha filter alone. Also see Adrian's image of the Crescent Nebula which uses the same technique.  Image © Adrian Brown.

The following is a wide field view of part of Cassiopeia which includes IC1805. Stars and deep sky objects are annotated. The image was taken by Adrian Brown on the 9th November 2005. He used one of Chris Newsome's Pentax camera lenses, a 28mm at f/4, and an ATK-16HR camera with an Astronomik hydrogen-alpha CCD filter. Adrian took 3 x 30 minute exposures which were stacked in Maxim DL. The field of view is approximately 18 degrees x 13 degrees. The two big nebulas IC1805 and IC1848 are visible as well as the Double Cluster towards the bottom of the image. The right of the image shows the two main constellation stars epsilon and delta Cassiopeiae and also two small open clusters M103 and NGC663. The open cluster Stock 2 is also visible. It has been called The Muscle Man on the web and if you turn your head on one side it does almost look like a figure of a stick man flexing his muscles!  Image © Adrian Brown.