Starship Asterisk*

Ann wrote: ↑Thu Feb 15, 2024 8:15 am

johnnydeep wrote: ↑Wed Feb 14, 2024 8:09 pm
Yup, I missed it. And it was your first image too! Thanks for finding its designation: SNR G206.9+2.3. But there are TWO bubbles. Isn't that
unusual to have been caused by a single supernova? Perhaps the double-ness is explained in one of the research papers I didn't read.

Bubble, bubble, toil and trouble, double bubble!

Pretending to be Neufer here, although he would be so much more precise in his Shakespeare reference!

Ann

http://shakespeare.mit.edu/macbeth/macbeth.4.1.html wrote: The Tragedy of Macbeth - Act 4, Scene 1

SCENE I. A cavern. In the middle, a boiling cauldron.

Thunder. Enter the three Witches

First Witch
Thrice the brinded cat hath mew'd.

Second Witch
Thrice and once the hedge-pig whined.

Third Witch
Harpier cries 'Tis time, 'tis time.

First Witch
Round about the cauldron go;
In the poison'd entrails throw.
Toad, that under cold stone
Days and nights has thirty-one
Swelter'd venom sleeping got,
Boil thou first i' the charmed pot.

ALL
Double, double toil and trouble;
Fire burn, and cauldron bubble.

johnnydeep wrote: ↑Wed Feb 14, 2024 8:09 pm
Yup, I missed it. And it was your first image too! Thanks for finding its designation: SNR G206.9+2.3. But there are TWO bubbles. Isn't that
unusual to have been caused by a single supernova? Perhaps the double-ness is explained in one of the research papers I didn't read.

Ann wrote: ↑Wed Feb 14, 2024 7:44 pm

johnnydeep wrote: ↑Wed Feb 14, 2024 7:20 pm What are the overlapping blue bubbles off to the far left of the "Rosette Nebula" annotation text in the APOD? I don't think they were pointed out by Ann above. (Also, though the astrobin link to the source image might point them out, that link is currently down for me. [ EDIT: nope - they aren't called out in the Astrobin link either. ])

Click to view full size image

They were (pointed out by me).

Click to view full size image

Maybe this "double bubble" is what Olivier Bernhard referred to?

Olivier Bernhard wrote:

The supernova on the left is The supernova remnant SNR G206.9+2.3

Yeah, I guess it was!

SNR G206.9+2.3 in Monoceros. Credit: Toshiya Arai - AstroBin

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Ann

johnnydeep wrote: ↑Wed Feb 14, 2024 7:20 pm What are the overlapping blue bubbles off to the far left of the "Rosette Nebula" annotation text in the APOD? I don't think they were pointed out by Ann above. (Also, though the astrobin link to the source image might point them out, that link is currently down for me. [ EDIT: nope - they aren't called out in the Astrobin link either. ])

Click to view full size image

Olivier Bernhard wrote:

The supernova on the left is The supernova remnant SNR G206.9+2.3

APOD Robot wrote: ↑Wed Feb 14, 2024 5:05 am Rosette Deep Field

Explanation: Can you find the Rosette Nebula? The large, red, and flowery-looking nebula on the upper left may seem the obvious choice, but that is actually just diffuse hydrogen emission surrounding the Cone and Fox Fur Nebulas. The famous Rosette Nebula is really located on the lower right and connected to the other nebulas by irregular filaments. Because the featured image of Rosetta's field is so wide and deep, it seems to contain other flowers. Designated NGC 2237, the center of the Rosette nebula is populated by the bright blue stars of open cluster NGC 2244, whose winds and energetic light are evacuating the nebula's center. The Rosette Nebula is about 5,000 light years distant and, just by itself, spans about three times the diameter of a full moon. This flowery field can be found toward the constellation of the Unicorn (Monoceros).

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Ann wrote: ↑Wed Feb 14, 2024 8:34 am Oh boy, this took some time! So where is the "exhausted" emoji?

Anyway...

Rosette Deep Field. Image Credit & Copyright: Olivier Bernard & Philippe Bernhard

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This picture by Antoine and Dalia Grelin shows the same overall view of this region as the APOD, even though the orientation is different. The blue reflection nebulosity at top in the APOD is faintly visible in the Grelin picture as well.

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So I decided to do some more annotations, and I'm going to start with the upper part of the APOD, the Fox Fur and Cone Nebula part of it:

APOD 14 February 2024 upper part annotated.png

The Fox Fur and Cone nebula part of the APOD.

I tried to show that the two 'wings' of Fox Fur and Cone Nebula complex (which I drew in pink in my annotated image) are slightly reminiscent of rose petals!

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A few notes here. First, you would be tempted to think that the Fox Fur/Cone Nebula complex is actually attached to the Rosette Nebula complex, but that's not the case. The distance to the Rosette Nebula is almost 5,000 light-years, but the distance to the Fox Fur/Cone Nebula complex is less than 3,000 light-years. But as I said, I'll start with the upper part of the APOD.

Here are two closeups of the "Christmas Tree" part of the APOD:

The Christmas Tree nebula, with the Cone Nebula and Fox Fur Nebulas. The Cone Nebula is at far left. The Fox Fur Nebula is immediately below brilliant star S Mon at right. Credit: Dieter Willasch

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S Mon and Christmas Tree goodastronomy and Steve Timmons.png

I just love the colors here! The Cone Nebula is at top and the Fox Fur
is at lower left. The faint peach-colored patch at upper center
is hidden star formation.Credit: @goodastronomy and Steve Timmons.

I like the picture by Bijan Moravej alahkami too, because it brings out the rich old yellow cluster Trumpler 5. And what about the brilliant closeup of Trumpler 5 by zirl?

The Cone Nebula and Fox Fur Nebulas, as well as IC 447 and old yellow cluster Trumpler 5. Blue reflection nebula IC 447 is at lower left. Old yellow-orange cluster Trumpler 5 is the orange patch at 9 o'clock. The Cone Nebula is near the top of the image, 'hanging down'. At top you can faintly see two 'wings' or 'rose petals', embracing the entire nebula complex. Credit: Bijan Moravej alahkami

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Trumpler 5 and red giant HD 260597 zirl.png

Old open cluster Trumpler 5. Credit: zirl.

Ann