M57 spectroscopy, 



M57 spectroscopy

M57 spectroscopy, 



M57 spectroscopy

Technical card

Imaging telescopes or lenses: TS Optics TS 65/420 Quadruplet  ·  Celestron C8

Imaging cameras: Astrel Instruments AST8300

Mounts: Vixen GP-DX  ·  Berlebach Uni 8 Tripod for GP-DX mount

Guiding telescopes or lenses: TS Optics 80/320

Focal reducers: Celestron F/6.3 focal reducer / corrector

Software: Deepskystacker  ·  Photoshop CS3

Filters: Astronomik RGB 27mm Deep Sky

Accessory: Lacerta MGEN2-Autoguider

Dates:May 20, 2018

Frames:Astronomik RGB 27mm Deep Sky: 9x180" (27') -20C bin 1x1

Integration: 27'

Darks: 40

Flats: 15

Bias: 50

Avg. Moon age: 5.60 days

Avg. Moon phase: 31.52%

Temperature: 13.00

Basic astrometry details

Astrometry.net job: 2069199

Resolution: 3365x2564

Locations: Garden, Bremen, Bremen, Germany; Achim near Bremen, Achim, Niedersachsen, Germany

Data source: Backyard


This is a spectroscopic image of M57. The picture shows the line emissions at h-alpha, OIII and h-beta on the left side of the order zero image. The resolotion is not great due to the relatively fast telescope (TS 65q f/6.5) which is not ideal for the used Baader 1 1/4" Blaze Grating Spectroscope (207 lines/mm).

The gaps in the star spectra are caused by the filter transmission functions of the used Astronomik RGB filters.

The inset shows a picture of M57 shot on May 9th with a C8 during a star session at my colleague and friend in Achim close to Bremen.