Question about M42
- Jnicholes
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Question about M42
I don’t care that I missed comet Borrelly and Uranus. This is my BEST PICTURE EVER!
I actually have a question about the Orion Nebula. As you can see, I also caught M43, De Mairans nebula. Right below De Mairans nebula is a dark patch in the Orion Nebula, commonly referred to as the “fish mouth.”
What is the fish mouth? Is it a dark nebula? Cloud of dust? What is it exactly? Does anyone know the answer to this? I’m currently researching myself.
I’m just curious.
Jared
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- OzEclipse Online
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Re: Question about M42
Joe
Amateur astronomer since 1978...................Web site : http://joe-cali.com/
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Re: Question about M42
http://www.sozvezdiya.ru/eng/o.phpOrion Nebula (M42, NGC1976) hii region that is easily visible to the naked eye as the central object in the sword of orion (RA 05h 35m.4 dec. -05°27'). The main part of the nebula is separated from a smaller part of the same cloud, known as M43 or NGC1982, by a dark absorbing region called the fish's mouth.
Looks like @OzEclipse is right. Funny, that it's so hard to find much anything about it.
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Re: Question about M42
Nice capture!
This area is M43, the Fish Mouth Nebula.
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Re: Question about M42
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Re: Question about M42
Thanks!
Jared
25mm plossl Eyepiece
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Iphone 11 Nightcap app Camera
"Our minds are finite, and yet even in these circumstances of finitude we are surrounded by possibilities that are infinite, and the purpose of life is to grasp as much as we can out of that infinitude."
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- notFritzArgelander
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Re: Question about M42
This is correct in every detail. The fish mouth is the darker area intruding into M42 and is part of the dust cloud separating M42 and M43. M42 and M43 can be viewed as a big fluorescent bubble with partial obscuration and intrusion from interstellar dust that's responsible for the fish mouth. Annotated images can be found here:
https://skyandtelescope.org/observing/s ... d12172014/
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Re: Question about M42
Scopes: Explore Scientific ED102 APO, Sharpstar 61 EDPH II APO, Samyang 135 F2 (still on the Nikon).
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- Don Pensack
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Re: Question about M42
M43 is NOT the Fish Mouth. The Fish Mouth is the dark intrusion into the Regio Centralis in M42.
M43 is the comma-shaped section of nebulosity with a bright star in the center that stands away from M42.
Currently using a 12.5" dob and a 4" apo refractor
- Don Pensack
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Re: Question about M42
It is dark because it doesn't have a nearby star reflecting from its dust grains, or exciting the gas to emit light.
Dark nebula is usually gas, not dust, but can be a mix of both, as is the case with most nebulae.
Currently using a 12.5" dob and a 4" apo refractor
- notFritzArgelander
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Re: Question about M42
Dark nebulae owe the bulk of their darkness to dust. If they were mostly gaseous they would be more transparent. The extinction of light from behind them is due entirely to interstellar dust grains in the densest part of cold molecular clouds.Don Pensack wrote: ↑Sun Feb 27, 2022 4:59 pm .....
Dark nebula is usually gas, not dust, but can be a mix of both, as is the case with most nebulae.
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Re: Question about M42
However, composition-wise, they are mostly gas, and almost all of the gas is molecular hydrogen.
Also, they are largely transparent in the infrared and longer wavelengths.
Currently using a 12.5" dob and a 4" apo refractor
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