NGC891

Wouter's Astro-photography

NGC891

 

NGC891 is a massive galaxy measuring about 110 000 light years in diamater and has a mass of about 150 billion suns. This splendid galaxy is seen almost perfectly from it's side which gives us a wonderful view on the dustlane.

 

This galaxy was discovered by Caroline herschel in 1784 and William herschel described it as "Considerably bright, much extended, above 15' long and 3' broad. A black division 3' or 4' long in the middle."

 

For small telescopes it's a great target provided that you have very dark skies. While the visual magnitude of 9.9 isn't that dim the surface brightnes is. This is due to the rather large apparent size of it . Though under dark skies it's not very hard to see even in a telescope as small as 4".

 

The image above was made at my home location in Belgium under heavily light polluted skies. (click the image for a larger view.)

Image data

Exposure: 72x300s

Filters: Baader UHC-S

Camera temperature: -15°C

Date: September 30th 2013

Location: Zele, Belgium

 

 

Equipment

Camera: SBIG ST2000XM

Telescope: Skywatcher MN190

Mount: Software Bisque Paramount MX

 

Processing

Image aquisition: The Sky X

Preprocessing: Deep sky stacker

Fitsconversion: Fitsliberator

image processing: Adobe Photoshop CS5

 

 

Object data

Designations:

NGC891

Caldwell 23

 

Constellation: Andromeda

 

Coördinates:

RA: 02h 22.6m

Dec: +42° 21'

 

Dimensions: 12.2' x 3.0'

 

Magnitude: 9.9

 

Surface brigtness: 13.7

 

Distance: 31 million lightyears

 

Discovered by Caroline Herschel in 1784

 

© Wouter D'hoye 2016 - Last update February 1st 2015