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Observation by Robin Leadbeater: Three galaxies - one redshift

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Robin Leadbeater

Observer

Robin Leadbeater

Observed

2021 Nov 24 - 20:56

Uploaded

2021 Nov 27 - 14:15

Objects

NGC7769
NGC7770
NGC7771
Spectrum

Equipment
  • ALPY 200 spectrograph
  • ATK 314 camera
  • Celestron C11 SCT 280mm aperture f5.5
Exposure

2400s (4x600s)

Location

Wigton, Cumbria

Target name

NGC 7769, NGC 7770, NGC 7771

Title

Three galaxies - one redshift

About this image

After a failed attempt to take a classifying spectrum for possible supernova AT 2021aexi in NGC 7771 (too faint, bright moon), I noticed two other galaxies in the same guider field so since I was there I decided to take spectra of all three.  The spectrum images are sky subtracted and the digitised spectra (R~130) are of the bright central regions. They all show clear H  alpha emission at similar redshift so are likely part of the same group at a similar distance.

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