Meade Image Processing Bedienungsanleitung PDF herunterladen (Seite 28)

NGC 6946: a spiral galaxy

Located in the constellation of Cygnus, NGC 6946 is a 9-g face-on spiral galaxy. In a 12-

inch telescope under very dark skies we may barely catch the glow of its center, if that;

otherwise it is completely invisible to the visual observer (too faint). Our trials of observing

it in Kennon Observatory, under campus lights, were completely unsuccessful.

Authors: John Doe, Jane Doe, students in ASTR 103 at Ole Miss.

Exposure time: a total of 6 hours, R-G-B_Hα filters, on Nov. 8 and 14, 2007.

Setup used: Meade 12” CST with Astro-Physics FR at f/5.9, SBIG ST-10 camera with a

CFW-10 filter wheel, Astrodon R-G-B-Hα filters; on a Paramount ME mount.

Original pixel size: 0.78 as, image size: 20 am × 30 am, North is up.

This galaxy is 18 million light-years from us. It is Sc type, its spiral arms are somewhat

more open than our galaxy’s, at there is no hint of a central bar.

The spiral arms are largely illuminated by bright, young, blue supergiant stars, and look

blue on the image. Notice the many red patches inside the spiral arms: these are large

molecular clouds (enhanced by our technique of inserting Hα-filtered images). They are the

locations of vigorous present-day star formation. The many stars on the picture are, in fact,

in the foreground: they are part of our galaxy.

1 2 ... 23 24 25 26 27 28 29

Keine Kommentare

Meade Image Processing Bedienungsanleitung Seite 28