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Hemisphere:  Northern  ·  Contains:  NGC 891, NGC 898, NGC 906, NGC 910, NGC891, NGC898, NGC906, NGC909, NGC910, NGC911, NGC912, NGC913, NGC914
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NGC891 and friends, 


            Thomas Richter
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NGC891 and friends

Technical card

Imaging telescopes or lenses: GSO 8" f/5 Newton

Imaging cameras: Moravian G2-8300FW

Mounts: SkyWatcher NEQ6 Pro Goto

Guiding telescopes or lenses: GSO 8" f/5 Newton

Guiding cameras: Astrolumina Alccd5L-IIc

Software: PhotoShop CS5  ·  PHD2 Guiding  ·  FitsWork 4  ·  DeepSky Stacker Deep Sky Stacker 3.3.4  ·  Seqence Generator Pro

Filters: Baader R 1.25'' CCD Filter  ·  Baader B 1.25'' CCD Filter  ·  Baader G 1.25'' CCD Filter  ·  Baader L 1.25'' Filter

Accessory: TSOptics TS Off Axis Guider - 9mm

Dates:Oct. 14, 2017

Baader B 1.25'' CCD Filter: 7x300" -20C bin 1x1
Baader G 1.25'' CCD Filter: 7x300" -20C bin 1x1
Baader L 1.25'' Filter: 21x300" -20C bin 1x1
Baader R 1.25'' CCD Filter: 7x300" -20C bin 1x1

Integration: 3.5 hours

Darks: ~35

Flats: ~27

Bias: ~100

Avg. Moon age: 24.22 days

Avg. Moon phase: 28.62% job: 1770423

RA center: 2h 24' 7"

DEC center: +42° 6' 49"

Pixel scale: 1.218 arcsec/pixel

Orientation: 3.242 degrees

Field radius: 0.623 degrees

Resolution: 2977x2171

Locations: Vockenroth, Neuhof, Bayern, Germany


Object description (

NGC 891 (also known as Caldwell 23) is an edge-on unbarred spiral galaxy about 30 million light-years away in the constellation Andromeda. It was discovered by William Herschel on October 6, 1784. The galaxy is a member of the NGC 1023 group of galaxies in the Local Supercluster. It has an H II nucleus.
The object is visible in small to moderate size telescopes as a faint elongated smear of light with a dust lane visible in larger apertures.
In 1999, the Hubble Space Telescope imaged NGC 891 in infrared.
In 2005, due to its attractiveness and scientific interest, NGC 891 was selected to be the first light image of the Large Binocular Telescope. In 2012, it was again used as a first light image of the Discovery Channel Telescope with the Large Monolithic Imager.

Supernova SN 1986J was discovered on August 21, 1986 at apparent magnitude 14.



Thomas Richter
License: None (All rights reserved)

Sky plot

Sky plot


NGC891 and friends, 


            Thomas Richter