Observation by Les Dickens: M81 ("Bode's nebula")

Uploaded by

Les Dickens

Observer

Les Dickens

Observed

2020 Jan 18 - 04:45

Uploaded

2020 Feb 15 - 17:34

Objects

M81

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Constellation

Ursa Major

Field centre

RA: 09^h55^m
Dec: +69°04'
Position angle: +93°33'

Field size

0°31' × 0°21'

Equipment

125mm f/15 Maksutov-cassegrain
200mm f/6 Newtonian
QHY9s mono CCD camera
Processed with IRIS software

Exposure

55 x 120s luminance; 7 x 120s each of RGB

Location

Cheltenham, Glos. 51° 53' 01" N, 02° 05' 42" W

Target name

M81 ("Bode's nebula")

Title

M81 ("Bode's nebula")

About this image

Not many clear nights so far, this winter. I took the white light images for this over 2 days - one in Dec 2019 and one in Jan 2020 - using a 125mm f/15 Maksutov. After a week or so waiting for another clear night, I gave up and pinched the RGB frames from a previous session in Mar 2019, taken with a 200mm f/6 Newtonian. Scaling and realigning the RGB images (~90° difference in alignment) was an entertaining exercise, but it seems to have turned out OK.

Files associated with this observation

M81 (Bode's nebula) 2020.01.18.jpg (708.4 kB)

Like this image

David Swan, Graham Winstanley, Jeremy Shears, Alan Thomas, Clive Nanson, Ray Emery, Nick Hewitt, Callum Potter, Ron Johnson, Andy Wilson, Miguel Araújo, Pauline Phillips, Mr Nicholas John Atkinson, Andrew Dumbleton

Comments

Clive Nanson, 2020 Feb 16 - 13:45 UTC

I thought I was the only one still using IRIS!

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