Barnard's Galaxy--NGC 6822
Posted: Sat Aug 15, 2020 5:40 pm
I'm steadily recovering my chops with StarTools. This project was just uploaded to Astrobin, at this URL: https://www.astrobin.com/2eyl4c/?nc=user
Here is the accompanying text:
Barnard’s Galaxy—NGC 6822
This is a barred irregular galaxy, part of the Local Group. It’s one of the closest galaxies to the Milky Way and is similar to the Small Magellanic Cloud.
Barnard’s Galaxy was very important in the history of astronomy. Edwin Hubble Hubble discovered 11 Cepheid variables in NGC 6822, which allowed him to measure the distance to the galaxy. He then wrote a paper in 1925 that resolved the “Great Debate” over the scale of the universe and the nature of spiral galaxies.
This image was captured with the RGB channels. I did not separately image Ha, because StarTools does an excellent job of presenting HII regions without a separate Ha channel.
Tech Notes for ASA 500/3.6:
ASA Newtonian, 500 mm aperture, 1900mm focal length, F3.6
FLI Proline 16803, 9 mm pixel, 4096 X 4096
ASA DDM85 equatorial mount
Processing with PixInsight and StarTools
Here is the accompanying text:
Barnard’s Galaxy—NGC 6822
This is a barred irregular galaxy, part of the Local Group. It’s one of the closest galaxies to the Milky Way and is similar to the Small Magellanic Cloud.
Barnard’s Galaxy was very important in the history of astronomy. Edwin Hubble Hubble discovered 11 Cepheid variables in NGC 6822, which allowed him to measure the distance to the galaxy. He then wrote a paper in 1925 that resolved the “Great Debate” over the scale of the universe and the nature of spiral galaxies.
This image was captured with the RGB channels. I did not separately image Ha, because StarTools does an excellent job of presenting HII regions without a separate Ha channel.
Tech Notes for ASA 500/3.6:
ASA Newtonian, 500 mm aperture, 1900mm focal length, F3.6
FLI Proline 16803, 9 mm pixel, 4096 X 4096
ASA DDM85 equatorial mount
Processing with PixInsight and StarTools