Observation by David Arditti: Pelican Nebula IC 5070

Uploaded by

David Arditti

Observer

David Arditti

Observed

2018 Sep 03 - 02:34

Uploaded

2018 Sep 03 - 20:49

Objects

IC5070

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Constellation

Cygnus

Field centre

RA: 20^h51^m
Dec: +44°08'
Position angle: +2°42'

Field size

1°20' × 0°59'

Equipment

81mm William Optics triplet refractor
0.8x focal reducer
CLS and 6nm H alpha filters
Artemis 285 mono CCD camera
Astro-Physics 1200GTO mount unguided

Exposure

32x2 mins CLS, 12x5 mins H alpha

Location

Edgware, Middlesex, UK

Target name

IC 5070

Title

Pelican Nebula IC 5070

About this image

This is not a true-colour image, but a combination of frames taken through a greenish light-pollution filter and a red Hydrogen alpha filter (6nm bandpass) on the nights of 2018 September 1/2 and 2/3. Total exposure was 2 hours 4 min. The CLS was used as luminosity on a red H alpha image. I may add some more data taken through other filters on future nights.

Conditions were poor, with moonlight, and high cloud in addition on the 3rd. It's interesting how effective the 6nm filter is in countering even these conditions, in which the naked-eye limiting magnitude was perhaps 3.0. The CLS filter is probably of little effect now against the local light pollution, which is primarily white. I may do tests comparing results to that of an L filter. A problem I found was that the filters, from different manufacturers, have quite different focus points. Of course one can re-focus, but that also changes the image scale slightly, because of the focal reducer. This means much adjustment is needed in processing.

The camera is an Artemis 285 mono camera that I've had for 12 years. I have to keep a Windows XP computer to run it, as it doesn't work with more recent Windows versions.

Files associated with this observation

IC5070-19-09-01WO81FR-CLS-H.jpg (537.1 kB)

Like this image

David Swan, Jeremy Shears, Graham Winstanley, Andy Wilson, Geof Lewis, Jimmy Fraser, Peter Carson, Alla Bonn

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