Observation by Kevin Gurney: Propeller nebula

Uploaded by

Kevin Gurney

Observer

Kevin Gurney

Observed

2022 Aug 17 - 23:15

Uploaded

2022 Aug 25 - 10:41

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Constellation

Cygnus

Field centre

RA: 20^h16^m
Dec: +43°37'
Position angle: -178°34'

Field size

1°43' × 1°51'

Equipment

Fornax 102
William Optics Star71
ZWO ASI1600MM pro
Atik EFW2
Baader narrowband filters
FLO OAG

Exposure

20x300s Ha, 17x300s OIII

Location

Charente, France

Target name

Propeller nebula

Title

Propeller nebula

About this image

This region of the sky is awash with HII regions (emission nebulae of ionised Hydrogen). When a 'knot' of sufficiently high density is found, it appears to be given a name... this one is no exception. It is also a catalogue aficianado's delight. Often going by the designation DWB111 (Dicke, Wendker and Bieritz listing) it also contains DWB119. However, it is also designated as number 57 in the Simeis catalogue (see http://cosmicneighbors.net/propellor.htm).

I used narrowband Ha and OIII (100mins and 85mins respectively) but the OIII signal in the nebulosity was poor. It's in there, and allows reasonably balanced stars, but disappoints in the nebula (Ha is rendered as red, and OII as blue/green). Acquird in Voyager and processed in Pixisnight.

[I have uploaded a higher contrast version here, since the original posting]

Files associated with this observation

proc1_HDRb_crop_2_Xnviewb.jpg (743.5 kB)

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Paul Whitmarsh, Dominic Ford

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