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APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)
Posted: Mon Aug 26, 2019 4:05 am
by APOD Robot
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.
Re: APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)
Posted: Mon Aug 26, 2019 4:31 am
by Ann
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!
Ann
Re: APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)
Posted: Mon Aug 26, 2019 11:07 am
by Case
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 amtruly gorgeous RGB (plus possibly other filters too)
It does seem to be L-RGB, per source link. No narrowband emphasis, or anything like that.
Re: APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)
Posted: Mon Aug 26, 2019 11:17 am
by orin stepanek
Lots of color; very nicely done!
Re: APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)
Posted: Mon Aug 26, 2019 11:39 am
by starsurfer
I was right!
Re: APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)
Posted: Mon Aug 26, 2019 11:40 am
by starsurfer
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 amtruly 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.
Re: APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)
Posted: Mon Aug 26, 2019 12:36 pm
by Ann
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 amtruly 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?
Ann
Re: APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)
Posted: Tue Aug 27, 2019 2:28 am
by Boomer12k
Awesome work...
:---[===] *
Re: APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)
Posted: Tue Aug 27, 2019 1:46 pm
by starsurfer
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.
Re: APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)
Posted: Tue Aug 27, 2019 2:50 pm
by Case
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.
Re: APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)
Posted: Tue Aug 27, 2019 3:10 pm
by Ann
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?
Ann
Re: APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)
Posted: Tue Aug 27, 2019 3:13 pm
by Ann
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.
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.
Ann
Re: APOD: NGC 2170: Angel Nebula Still Life (2019 Aug 26)
Posted: Wed Aug 28, 2019 9:44 pm
by Ann
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!!!
Ann