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APOD: The Heart and Soul Nebulas (2019 Jan 15)
Posted: Tue Jan 15, 2019 5:06 am
by APOD Robot
The Heart and Soul Nebulas
Explanation: Is the heart and soul of our Galaxy located in
Cassiopeia? Possibly not, but that is where two bright
emission nebulas nicknamed
Heart and Soul can be found. The
Heart Nebula, officially dubbed
IC 1805 and visible in the featured image on the bottom right, has a shape reminiscent of a classical
heart symbol. The
Soul Nebula is officially designated IC 1871 and is visible on the upper left.
Both nebulas shine brightly in the red light of
energized hydrogen. Also shown in this three-color montage is light emitted from
sulfur, shown in yellow, and
oxygen, shown in blue. Several young
open clusters of
stars are visible near the nebula centers.
Light takes about 6,000 years to reach us from
these nebulas, which together span roughly 300
light years.
Studies of stars and clusters like those found in the
Heart and
Soul Nebulas have focused on how
massive stars form and how they
affect their environment.
Re: APOD: The Heart and Soul Nebulas (2019 Jan 15)
Posted: Tue Jan 15, 2019 7:42 am
by Boomer12k
It always amazes me to see Oxygen in blue in space images... I keep having to remind myself that it is a "star process"...I just find it amazing for some reason...
:---[===] *
Re: APOD: The Heart and Soul Nebulas (2019 Jan 15)
Posted: Tue Jan 15, 2019 2:21 pm
by starsurfer
Boomer12k wrote: ↑Tue Jan 15, 2019 7:42 am
It always amazes me to see Oxygen in blue in space images... I keep having to remind myself that it is a "star process"...I just find it amazing for some reason...
:---[===] *
I love planetary nebulae with OIII.
Re: APOD: The Heart and Soul Nebulas (2019 Jan 15)
Posted: Tue Jan 15, 2019 3:05 pm
by BDanielMayfield
'I left my heart in Sagittarius'.
Well, that's where the real heart of the galaxy is.
Re: APOD: The Heart and Soul Nebulas (2019 Jan 15)
Posted: Tue Jan 15, 2019 3:14 pm
by ggergm
Although APOD has been my Internet homepage for 20 years, and I save my favorite images as random desktop backgrounds, this is the first time I've felt the need to discuss one.
What is the difference between IC 1871 and IC 1898? APOD has used both designations for the Soul Nebula. I tried using Google as my friend to find the answer but came up bupkis.
Here is a previous APOD that calls the Soul Nebula IC 1898. Today's uses IC 1871.
https://apod.nasa.gov/apod/ap180821.html
Re: APOD: The Heart and Soul Nebulas (2019 Jan 15)
Posted: Tue Jan 15, 2019 3:46 pm
by bystander
ggergm wrote: ↑Tue Jan 15, 2019 3:14 pm
What is the difference between IC 1871 and IC 1898? APOD has used both designations for the Soul Nebula. I tried using Google as my friend to find the answer but came up bupkis.
Here is a previous APOD that calls the Soul Nebula IC 1898. Today's uses IC 1871.
https://apod.nasa.gov/apod/ap180821.html
IC 1871 doesn't show in today's APOD, but in the APOD you linked to it is the small bright nebula on the extreme left. The Soul Nebula is actually IC 1848.
http://www.atlasoftheuniverse.com/nebulae/ic1805.html
Re: APOD: The Heart and Soul Nebulas (2019 Jan 15)
Posted: Tue Jan 15, 2019 7:30 pm
by DL MARTIN
Previous APODs have identified the Heart as being 7500 light years away and the Soul as 6500. Yet today, the combined entities are described as having a common light source that takes 6,000 light years to reach us. why the discrepancy?
Re: APOD: The Heart and Soul Nebulas (2019 Jan 15)
Posted: Tue Jan 15, 2019 7:55 pm
by neufer
DL MARTIN wrote: ↑Tue Jan 15, 2019 7:30 pm
Previous APODs have identified the Heart as being 7500 light years away and the Soul as 6500. Yet today, the combined entities are described as having a common light source that takes 6,000 light years to reach us. why the discrepancy?
Because that is what
http://www.atlasoftheuniverse.com/nebulae/ic1805.html suggests
(Definitely more detailed if not more accurate than old APODs or Wikipedia.)
Re: APOD: The Heart and Soul Nebulas (2019 Jan 15)
Posted: Tue Jan 15, 2019 11:51 pm
by Ann
neufer wrote: ↑Tue Jan 15, 2019 7:55 pm
DL MARTIN wrote: ↑Tue Jan 15, 2019 7:30 pm
Previous APODs have identified the Heart as being 7500 light years away and the Soul as 6500. Yet today, the combined entities are described as having a common light source that takes 6,000 light years to reach us. why the discrepancy?
Because that is what
http://www.atlasoftheuniverse.com/nebulae/ic1805.html suggests
(Definitely more detailed if not more accurate than old APODs or Wikipedia.)
My impression is that modern revisions of earlier distance estimates have often put the objects closer to us than previously thought.
Let's hope that Gaia can resolve the matter.
Ann