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Observation by John Hughes: NGC 7635 - Bubble & the Cluster

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John Hughes


John Hughes


2019 Sep 17 - 22:06


2019 Sep 22 - 12:12



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Field centre

RA: 23h20m
Dec: +61°10'
Position angle: -3°27'

Field size

1°25' × 1°04'

  • William Optics Z103ED
  • Skywatcher NEQ6 R Pro mount
  • ZWO ASI1600mm Pro Cooled camera
  • Baader Ha, Oiii and Sii barrow band filters

Gain 139, Offset 50


North Essex

Target name

NGC 7635


NGC 7635 - Bubble & the Cluster

About this image

The image above represents my interpretation of NGC 7635 in the Hubble Palette and has been framed to also capture M52 an open star cluster. Both targets are located  in the constellation of Cassiopeia. The acquisition details are as follows;

William Optics Z103ED scope with guiding provided by the William Optics 50mm guidescope and ASI290mm- mini guide camera.

Imaged with the ZWO ASI1600mm Pro cooled camera using Baader 1.25” narrowband filters - Ha 7nm, Oiii 8.5nm and Sii 8nm. Acquisition software was Astrophotography Tool and guidance provided by PHD2.

Sub frames all taken at a gain of 139 and offset of 50. All 5 minute exposures;

Ha x 41

Oiii x 35

Sii x 40

Total integration time 9.6 hours.

Backfocus remains an issue though I am gradually getting there with modest adjustments each time I image.

Thanks for checking in.


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