APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)

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APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)

Post by APOD Robot » Mon Aug 26, 2019 4:05 am

Image NGC 2170: Angel Nebula Still Life

Explanation: Is this a painting or a photograph? In this classic celestial still life composed with a cosmic brush, dusty nebula NGC 2170, also known as the Angel Nebula, shines near the image center. Reflecting the light of nearby hot stars, NGC 2170 is joined by other bluish reflection nebulae, a red emission region, many dark absorption nebulae, and a backdrop of colorful stars. Like the common household items that still life painters often choose for their subjects, the clouds of gas, dust, and hot stars featured here are also commonly found in this setting -- a massive, star-forming molecular cloud in the constellation of the Unicorn (Monoceros). The giant molecular cloud, Mon R2, is impressively close, estimated to be only 2,400 light-years or so away. At that distance, this canvas would be over 60 light-years across.

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Ann
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Re: APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)

Post by Ann » Mon Aug 26, 2019 4:31 am

Don't have time to write much, but I must say that today's APOD is a truly gorgeous RGB (plus possibly other filters too) image! :D :yes: :clap:

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Re: APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)

Post by Case » Mon Aug 26, 2019 11:07 am

You have to look hard to recognize NGC 2170 in other semi wide field images, but here in today’s APOD image it looks deep, busy and impressive.
https://apod.nasa.gov/apod/ap190821.html
https://apod.nasa.gov/apod/ap151123.html
Nice to see the nebulae that may get less attention than others. The Unicorn is so close to the Hunter.
Ann wrote:
Mon Aug 26, 2019 4:31 am
truly gorgeous RGB (plus possibly other filters too)
It does seem to be L-RGB, per source link. No narrowband emphasis, or anything like that.
Last edited by Case on Mon Aug 26, 2019 11:25 am, edited 1 time in total.

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Re: APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)

Post by orin stepanek » Mon Aug 26, 2019 11:17 am

Lots of color; very nicely done! 8-)
Orin

Smile today; tomorrow's another day!

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Re: APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)

Post by starsurfer » Mon Aug 26, 2019 11:39 am

I was right! :D :lol2:

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Re: APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)

Post by starsurfer » Mon Aug 26, 2019 11:40 am

Case wrote:
Mon Aug 26, 2019 11:07 am
You have to look hard to recognize NGC 2170 in other semi wide field images, but here in today’s APOD image it looks deep, busy and impressive.
https://apod.nasa.gov/apod/ap190821.html
https://apod.nasa.gov/apod/ap151123.html
Nice to see the nebulae that may get less attention than others. The Unicorn is so close to the Hunter.
Ann wrote:
Mon Aug 26, 2019 4:31 am
truly gorgeous RGB (plus possibly other filters too)
It does seem to be L-RGB, per source link. No narrowband emphasis, or anything like that.
Narrowband has almost no effect on this nebula unless it is an image with a really wide field of view.

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Ann
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Re: APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)

Post by Ann » Mon Aug 26, 2019 12:36 pm

starsurfer wrote:
Mon Aug 26, 2019 11:40 am
Case wrote:
Mon Aug 26, 2019 11:07 am
You have to look hard to recognize NGC 2170 in other semi wide field images, but here in today’s APOD image it looks deep, busy and impressive.
https://apod.nasa.gov/apod/ap190821.html
https://apod.nasa.gov/apod/ap151123.html
Nice to see the nebulae that may get less attention than others. The Unicorn is so close to the Hunter.
Ann wrote:
Mon Aug 26, 2019 4:31 am
truly gorgeous RGB (plus possibly other filters too)
It does seem to be L-RGB, per source link. No narrowband emphasis, or anything like that.
Narrowband has almost no effect on this nebula unless it is an image with a really wide field of view.
You mean because there is so little ionization in this set of nebulas in the first place?

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Re: APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)

Post by Boomer12k » Tue Aug 27, 2019 2:28 am

Awesome work...

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Re: APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)

Post by starsurfer » Tue Aug 27, 2019 1:46 pm

Ann wrote:
Mon Aug 26, 2019 12:36 pm
starsurfer wrote:
Mon Aug 26, 2019 11:40 am
Case wrote:
Mon Aug 26, 2019 11:07 am
You have to look hard to recognize NGC 2170 in other semi wide field images, but here in today’s APOD image it looks deep, busy and impressive.
https://apod.nasa.gov/apod/ap190821.html
https://apod.nasa.gov/apod/ap151123.html
Nice to see the nebulae that may get less attention than others. The Unicorn is so close to the Hunter.


It does seem to be L-RGB, per source link. No narrowband emphasis, or anything like that.
Narrowband has almost no effect on this nebula unless it is an image with a really wide field of view.
You mean because there is so little ionization in this set of nebulas in the first place?

Ann
Well yeah because it's nearly all reflection or dark nebulae. However my challenge for you is to find NGC 2170 in this Ha mosaic of Orion by John Gleason.

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Re: APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)

Post by Case » Tue Aug 27, 2019 2:50 pm

The reddish nebulosity is almost absent in DDS imaging (3 filters: 3950–5400, 6300–6900, 6950–9000 Å), which has a few wavelength gaps that I guess is significant to that dust.

Image

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Ann
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Re: APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)

Post by Ann » Tue Aug 27, 2019 3:10 pm

starsurfer wrote:
Tue Aug 27, 2019 1:46 pm
Ann wrote:
Mon Aug 26, 2019 12:36 pm
starsurfer wrote:
Mon Aug 26, 2019 11:40 am

Narrowband has almost no effect on this nebula unless it is an image with a really wide field of view.
You mean because there is so little ionization in this set of nebulas in the first place?

Ann
Well yeah because it's nearly all reflection or dark nebulae. However my challenge for you is to find NGC 2170 in this Ha mosaic of Orion by John Gleason.
It's at 7 o'clock, isn't it?

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Ann
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Re: APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)

Post by Ann » Tue Aug 27, 2019 3:13 pm

Case wrote:
Tue Aug 27, 2019 2:50 pm
The reddish nebulosity is almost absent in DDS imaging (3 filters: 3950–5400, 6300–6900, 6950–9000 Å), which has a few wavelength gaps that I guess is significant to that dust.

Image
Interesting. The reddish nebulosity should be well visible in the interval 6300–6900 Å. Presumably the Hα emission is so faint that it either takes an Hα filter to see it, or else you must process the image so that you enhance the red channel.

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Re: APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)

Post by Ann » Wed Aug 28, 2019 9:44 pm

starsurfer wrote:
Tue Aug 27, 2019 1:46 pm

Well yeah because it's nearly all reflection or dark nebulae. However my challenge for you is to find NGC 2170 in this Ha mosaic of Orion by John Gleason.
Starsurfer, noooo! I meant to say that NGC 2170 was in the lower right part of the image (at 5 o'clock), but I happened to write 7 o'clock. Honestly!!!

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