Trifid Nebula

M20, a nebula in Virgo, is known as the Trifid Nebula. Its nebulosity is a combination of both emission and reflection nebulae and also includes a star cluster.

M21, an additional star cluster, appears on the far right.

Taken in suburbia, my light pollution filter seems to enable good contrast and detail for black & white imaging; but in colour (see below) the image appears with a strong blue hue which I have found difficult to reduce without affecting the object itself.

Details:

Exposure: 10 x 4 min  ISO 800
Gear: Skywatcher ED120 refractor, 840mm f/l, f/7, Canon EOS 60D. LP filter, no flattener
Location: Leumeah, NSW
Date: 2017-07-18

Object 1:

Messier 20, NGC 6514
Visual magnitude: +6.3
Apparent diameter: 29 x 27 arc-min
Actual diameter: 44 light years
Distance: 5,200 light years

Object 2:

Messier 21, NGC 6531
Visual magnitude: +5.9
Apparent diameter: 14 arc-min
Actual diameter: 16 light years
Distance: 1,200 light years

The processed colour image is not very satisfying:

2017-07-18 M20 Trifid Nebula 5x4min 840mm f7 ISO800dss gnu
2017-07-18: M20 Trifid Nebula 5x4min 840mm f7 ISO800 Colour

Images © R.Powell


 

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2 Comments

  1. Wow, the Trifid Nebula – Mgławica Trójlistna Koniczyna – the superb capture!!!

    Roger, the stellar jet is visible (SW from the nebula’s central star)?
    The radiation from that star makes the jet glow?
    🙂

    Like

  2. Yes, Kazia, to the extent that this is an emission nebula, the glow is due to intense radiation from the newborn stars within. I doubt if there are any jets visible on this image but I could be wrong.

    Like

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