Observation by Nik Szymanek: M78

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Nik Szymanek


Nik Szymanek


2021 Jan 11 - 00:07


2021 Jan 30 - 13:11



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Ursa Major

Field centre

RA: 11h04m
Dec: +35°22'
Position angle: -111°25'

Field size

2°39' × 2°39'

  • Telescope: ASA 500N Newtonian. 500mm aperture, focal length 1900mm, f/3.8
  • CCD Camera: Finger Lake Instruments FLI 16803. 4096 x 4096 array. 0.98 arc-seconds per pixel.
  • Equatorial Mount: ASA DDM85 direct drive.
  • Astrodon LRGB filters



Rio Hurtado Valley, Chile

Target name




About this image

Data acquired remotely using the Telescope Live CHI-4 telescope located at El Sauce Observatory, Chile.

Right-click on image and open in new tab to zoom in for detailed view.


Lum: 3 x 10m

R: 3 x 10m

G: 3 x 10m

B: 3 x 10m


Processed with Maxim DL, PixInsight and Photoshop.


Files associated with this observation
Like this image
Nick Hewitt
Nick Hewitt, 2021 Jan 30 - 17:59 UTC

Wonderful image Nik! No sign of McNeil's, but V1647 showing up nicely! Can I use it in a talk?

Nik Szymanek
Nik Szymanek, 2021 Jan 30 - 18:57 UTC

Thanks Nick. PM sent.

Mike Harlow
Mike Harlow, 2021 Jan 30 - 21:01 UTC

Stunning image Nick S.  Regarding McNeil's nebula, it looks like the red smudge is the faintly illuminated northern lobe.  As far as I can see V1647 is still invisible even in this deep image. (South up...well it was taken from Chile!). Do you have some idea of the limiting magnitude you are reaching?

Nik Szymanek
Nik Szymanek, 2021 Jan 31 - 13:32 UTC

Thanks Mike. I've done a quick check using Maxim DL and the limiting magnitude seems to be about 19. I've got a more-knowledgeable friend checking this for me so the value might be revised.

Nik Szymanek
Nik Szymanek, 2021 Jan 31 - 20:15 UTC

A good friend of mine, Eric Watkins, used Astrometrica to carry out a detailed photometric analysis of the three 600-second sub-exposures that make up the Luminance component of the image. His conclusion is that the stacked file has reached magnitude 23 and possibly 24, so way deeper than my naïve estimate of mag 19! 

Mike Harlow
Mike Harlow, 2021 Feb 01 - 15:24 UTC

Thanks Nick, that's really useful feedback.  A lovely image and a useful magnitude limit placed on V1647 Ori at the same time.

McNeil's nebula is only visible when V1647 is 'bright' (mag. 15 ish)...so it won't be back again any time soon! (That's my theory anyway...).

Thanks, Mike

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