Observation by Kevin Gurney: Sh2-115 (Bi-colour)

Uploaded by

Kevin Gurney

Observer

Kevin Gurney

Observed

2023 Sep 15 - 18:37

Uploaded

2024 Feb 01 - 18:56

Objects

Sharpless 115
Abell 71

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Constellation

Cygnus

Field centre

RA: 20^h34^m
Dec: +47°01'
Position angle: +162°12'

Field size

2°48' × 2°06'

Equipment

William Optics Star 71
Fornax 102 mount
ZWO ASI 1600MM
Baader filters Ha, OIII
Atik EFW
SX Lodestar2
Starkeeper Voyager, Pixinsight, PhD2, XnView

Exposure

Ha - 40x300s, OIII - 36x300s (all bin 1x1)

Location

Charente, France

Target name

Sh2-115

Title

Sh2-115 (Bi-colour)

About this image

Number 115 in the Sharpless catalogues of HII regions is a faint emission nebula near Deneb in Cygnus. The image is comprised of 6hrs 20mins of narrowband data, split roughly equally between Ha and OII filters. I rendered the Ha as red and the OIII as blue+green. The OII signal was much weaker in my data than the Ha, but it helps tone-down the Ha signal, and is actually visible in small patches near the edges of the image.

I used StarExterminator in Pixinsight to separate the stars from the nebula for final processing. The stars were then diminished somewhat (using the morphology tool) and recombined with the nebula. I found this to be a compromise between a 'star-cluttered' image of a nebula, and a 'star-free' one which, personally, I find a little dissonant.

A bonus is the object Abell 71 - the small circular patch just below and left of centre. The Abell designation suggests a planetary nebula, but this status is apparently now under debate

Files associated with this observation

Sh2-115-BAA.jpg (1.6 MB)

Like this image

Simon Paul Davis, Callum Potter, Graham Winstanley

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