Graem Lourens © 2017
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SH2-157 Lobster Claw Nebula

Sharpless 157, also known as the Lobster Claw Nebula, is a bright emission nebula in the constellation Cassiopeia, very close the the more well known ‘Bubble Nebula’.

Distance to earth: Unknown to me
Apparent size: 60 arcminutes (2 x the moon)

Imaging time: 25 hours

Equipment:
Mount: SW AZEQ6GT
Telescope: SW Evostar 80ED
Camera: Atik 460EX Mono

Capture information:
Date: October 2018
Total exposure time: 25 hours
Color combination: SIIHAOIII (HST)

Image data:
33 x 1200s HA
21 x 1200 OIII bin4
21 x 1200 SII bin4