NGC 891 (Caldwell 23) and NGC 898

Imaging telescope or lens: Teleskop Service 8 inch f/8 Ritchey-Chrétien Astrograph

Imaging camera: ZWO ASI1600MM-Cool

Mount: Celestron CGEM-DX

Guiding telescope or lens: Omegon Microspeed Guide Scope 60mm

Focal reducer: Astro Physics CCDT67

Software: Ripley Pixinsight 1.8 core version, Main Sequence Software Sequence Generator Pro, Luc Coiffier DeepSkyStacker , Photoshop CC

Filters: Baader Planetarium B-CCD 1.25", Baader Planetarium G-CCD 1.25", Baader Planetarium R-CCD 1.25", Lumicon Deep Sky 1.25"

Accessory: ZWO EFW 8x 1.25"

Resolution: 1920x1080

Dates: Aug. 20, 2017, Aug. 22, 2017

Frames:

Baader Planetarium B-CCD 1.25": 37x90" (gain: 139.00) -20C bin 1x1

Lumicon Deep Sky 1.25": 60x60" (gain: 139.00) -20C bin 1x1

Lumicon Deep Sky 1.25": 130x90" (gain: 139.00) -20C bin 1x1

Baader Planetarium G-CCD 1.25": 55x90" (gain: 139.00) -20C bin 1x1

Baader Planetarium R-CCD 1.25": 62x90" (gain: 139.00) -20C bin 1x1

Integration: 8.1 hours

Darks: ~20

Flats: ~20

Bias: ~40

Avg. Moon age: 13.92 days

Avg. Moon phase: 2.14%

Bortle Dark-Sky Scale: 5.00

Temperature: 12.00

Astrometry.net job: 1702882

RA center: 35.688 degrees

DEC center: 42.280 degrees

Pixel scale: 1.412 arcsec/pixel

Orientation: 88.206 degrees

Field radius: 0.432 degrees

Locations: Home Backyard, Geleen, Limburg, Netherlands

Done