Observation by David Davies: NGC 4236, Caldwell 3

Uploaded by

David Davies

Observer

David Davies

Observed

2023 Feb 20 - 23:51

Uploaded

2023 Mar 29 - 10:56

Objects

NGC4236

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Constellation

Draco

Field centre

RA: 12^h16^m
Dec: +69°28'
Position angle: +0°04'

Field size

0°40' × 0°31'

Equipment

250mm RC telescope
x0.7 reducer
QSI 683 camera
SW EQ8 mount

Exposure

80 x 120s Lum, 15 x 300s RGB

Location

Cambridge, UK

Target name

NGC 4236, Caldwell 3

Title

NGC 4236, Caldwell 3

About this image

NGC4236 is a famously difficult target to observe. It is a barred spiral galaxy with a large extent in the sky. Its length is more than 2/3 the Moon’s width, but it has a very low surface brightness, barely brighter than the background glow of the sky. The mean surface brightness is 24.3 mag/asec2; the outer arms are much fainter. Given that there are magnitude 9 and 10 stars nearby, which I did not want to overexpose, I elected to try and capture the galaxy with many short exposures. The clusters of faint background galaxies at the northern end of 4236 are worth inspecting.

Files associated with this observation

NGC4236_web.jpg (1.2 MB)

Like this image

Callum Potter, Simon Paul Davis, Tim Haymes, David Basey, Paul Whitmarsh, Graham Winstanley

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