Instrument data

A varying set of instruments is used to capture single images (frames) which are digitally combined to larger images.

The first table contains the technical data of the instruments.

Instrument index Emission line / Bandwidth / Filter Field of view Aperture Resolution Comment
1 H-alpha, 3.5nm 7.6°×5.8° 5 cm 9" (FWHM) Panasonic MN34230 sensor, f=135mm lens
2 Bayer CFA + Light pollution filter 15.5°×10.3° 7 cm 17" (FWHM) Consumer grade digital photo camera, f=135mm lens
3 H-alpha, 3.5nm 7.6°×5.8° 6 cm 9" (FWHM) Panasonic MN34230 sensor, f=135mm lens
4 H-alpha, 35nm 7.6°×5.8° 5 cm 9" (FWHM) Panasonic MN34230 sensor, f=135mm lens, Used for exact continuum measurement (pass band centered to emission line) in combination with narrow band filters.
5a 410nm to 550nm (SDSS G') 6.8°×4.5° 10 cm 9" (FWHM) Sony IMX455 sensor, f=300mm lens
5b 555nm to 650nm (SDSS R' + 400 to 650nm IR-cut) 6.8°×4.5° 10 cm 9" (FWHM) Sony IMX 455 sensor, f=300mm lens
5c 695nm to 845nm (SDSS I') 6.8°×4.5° 10 cm 9" (FWHM) Sony IMX 455 sensor, f=300mm lens

The second table shows how much of the instruments form the first table where / are active in which period

Camera index: 1 2 3 4 5a 5b 5c
Nov 2018 to Apr 2020 4 2
Apr 2020 to Jul 2020 1 2 3
Jul 2020 to Jan 2022 2 3 1
Since Jan 2022 2 3 1 1 1 1

Currently the whole northern sky downto DEC=-16° is photographed in H-alpha light and in continuum light. Its planned to extend this to other emission lines.

Some early results showing selected regions can be found in the wide field nebulae section.

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