British Astronomical Association
Supporting amateur astronomers since 1890

BAA Images BAA image gallery Picture of the week

Observation by Kevin Gurney: The Bubble Nebula in Narrowband

Uploaded by

Paul Downing, FRAS

Observer

Kevin Gurney

Observed

2019 Jun 17 - 22:00

Uploaded

2019 Jul 13 - 09:25

Objects

NGC7635

Planetarium overlay









Constellation

Cassiopeia

Field centre

RA: 23h20m
Dec: +61°11'
Position angle: -1°47'

Field size

0°19' × 0°22'

Equipment
  • Celestron 8SE scope
  • ZWO ASI1600MM-Pro Cool camera
Exposure

Baader Planetarium Ha 1.25" 7nm: 10x300" -20C bin 1x1 Baader Planetarium OIII 1.25" 8.5nm: 10x300" -20C bin 1x1 Baader Planetarium S2 1.25" 8nm: 10x300" -20C bin 1x1

Location

Embourie, Charente, France

Target name

NGC 7635

Title

The Bubble Nebula in Narrowband

About this image
Kevin captured this narrowband image of NGC 7635 (bubble nebula) in France under a reportedly "beautiful clear sky", but a full moon, so narrowband was the only option.
The nominal palette is Ha = red, OIII = blue, SII = Green (although there isn't much at SII to be honest). The eventual colour mix with Ha more 'orangy', occurs to get a good colour balance for stars in Pixinsight. The blue then mixes with this to give a purple(ish) central region where any OII occurs.
Details are:
----
Bubble Nebula: NGC 7635

17th June 2019

Embourie, Charente, France

Kit:
Imaging telescope or lens:Celestron 8SE
Imaging camera:ZWO ASI1600MM-Pro Cool
Mount:SkyWatcher AZ-EQ6GT
Focal reducer:ASA 2" Reducer Corrector 0,77
Software:XnView,  Hyperion Prism v10,  PixInsight 1.8 Ripley
Filters:Baader Planetarium S2 1.25" 8nm,  Baader Planetarium Ha 1.25" 7nm,  Baader Planetarium OIII 1.25" 8.5nm
Files associated with this observation
Like this image
Copyright of all images and other observations submitted to the BAA remains with the owner of the work. Reproduction of work by third parties is expressly forbidden without the consent of the copyright holder. By submitting images to this online gallery, you grant the BAA permission to reproduce them in any of our publications.