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Observation by Mike Harlow: Gyulbudaghian's variable nebula

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Mike Harlow


Mike Harlow


2021 Oct 06 - 06:30


2021 Oct 06 - 08:08


Gyulbudaghian's variable nebula

  • 12 inch F/3.6 astrograph
  • Starlight Xpress H16 CCD (2048 x 2048 pxl)
  • Astrodon luminance filter (400-700nm)
  • iTelescope T21

368 x 30 seconds with 12 inch, 5 x 180 seconds with iTelescope 43cm


Ipswich, UK and iTelescope, New Mexico

Target name

Gyulbudaghian's variable nebula


Gyulbudaghian's variable nebula

About this image

Latest results to compare two different telescopes under very different sky conditions.  The home scope is near sea level in Suffolk, UK and iTelescope T21 is at 2200 meters in New Mexico.  3 hours of exposures from home (left image) and 45 minutes of exposures on T21 (right image).

The two systems show the same brightness and morphology for the nebula.  But given what Grant Privett can achieve with a 4.5 inch scope maybe I'll give up!!!

Observations were carried out over several nights and combined to produce the images above.  From home I imaged on 27th and 29th September and 1st and 3rd October.  Remote images were taken on 3rd, 5th and 6th October (UT).  Each field is ~ 10 x 10 arc minutes with north up.

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Grant Privett
Grant Privett, 2021 Oct 06 - 11:34 UTC

But, even ignoring the bad focus, the resolution on mine was rubbish with a 3.9arc sec plate scale!  Interesting, how much clearer the Herbig Haro is on yours.

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