APOD: Sh2 155: The Cave Nebula (2013 Oct 19)

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APOD: Sh2 155: The Cave Nebula (2013 Oct 19)

Post by APOD Robot » Sat Oct 19, 2013 4:27 am

Image Sh2 155: The Cave Nebula

Explanation: This colorful skyscape features the dusty, reddish glow of Sharpless catalog emission region Sh2-155, the Cave Nebula. About 2,400 light-years away, the scene lies along the plane of our Milky Way Galaxy toward the royal northern constellation of Cepheus. Astronomical explorations of the region reveal that it has formed at the boundary of the massive Cepheus B molecular cloud and the hot, young, blue stars of the Cepheus OB 3 association. The bright rim of ionized hydrogen gas is energized by the radiation from the hot stars, dominated by the bright blue O-type star above picture center. Radiation driven ionization fronts are likely triggering collapsing cores and new star formation within. Appropriately sized for a stellar nursery, the cosmic cave is over 10 light-years across.

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Re: APOD: Sh2 155: The Cave Nebula (2013 Oct 19)

Post by geckzilla » Sat Oct 19, 2013 4:27 am

Whoops, Otto was still in government shutdown mode. How could I forget to flip that switch?
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Re: APOD: Sh2 155: The Cave Nebula (2013 Oct 19)

Post by Beyond » Sat Oct 19, 2013 4:36 am

geckzilla wrote:Whoops, Otto was still in government shutdown mode. How could I forget to flip that switch?
No problemento, geckzilla. Now, if you would be so kind, could you flip the switch that explains why it is called the Cave Nebula :?: I don't see any resemblance to a cave, what-so-ever.
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Re: APOD: Sh2 155: The Cave Nebula (2013 Oct 19)

Post by Boomer12k » Sat Oct 19, 2013 6:13 am

Beyond wrote:
geckzilla wrote:Whoops, Otto was still in government shutdown mode. How could I forget to flip that switch?
No problemento, geckzilla. Now, if you would be so kind, could you flip the switch that explains why it is called the Cave Nebula :?: I don't see any resemblance to a cave, what-so-ever.

I guess it is that huge, dark, opening on the left????

But the right side of that area looks like a Bat Demon's Head......BAT CAVE NEBULA????

Nice picture.

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Re: APOD: Sh2 155: The Cave Nebula (2013 Oct 19)

Post by Ann » Sat Oct 19, 2013 8:24 am

That's a very nice image! :D

I checked the area with my software, and the blue stars are indeed very young. All are main sequence stars, and none is evolved, even though massive stars like these ones evolve very quickly.

All the brighter stars in the picture are far away. Even the red star is pretty far away, but it is a foreground object nonetheless. Its parallax is just a bit larger than the parallaxes of the blue stars, and its proper motion is quite different. I also think that the red star is a little bit less affected by dust than the blue stars, although I can't be sure. The blue stars are all quite reddened by all the dust around them. Most of them have apparent B-V indexes around +0.6, similar to the B-V index of the Sun, but in reality they have color indexes around -0.2.

According to my software there are at least two O stars among these stellar youngsters. Apart from the one at top, there is also the one at bottom right, whose lower diffraction spikes have been "cut off"!

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Re: APOD: Sh2 155: The Cave Nebula (2013 Oct 19)

Post by starsurfer » Sat Oct 19, 2013 12:14 pm

Yay Jimmy Walker's finally got an APOD! :D
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Re: APOD: Sh2 155: The Cave Nebula (2013 Oct 19)

Post by orin stepanek » Sat Oct 19, 2013 12:17 pm

I have to agree with Beyond: I don't see any semblance to a cave! :shock:
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Re: APOD: Sh2 155: The Cave Nebula (2013 Oct 19)

Post by neufer » Sat Oct 19, 2013 12:37 pm

Image
orin stepanek wrote:
Beyond wrote:
I don't see any resemblance to a cave, what-so-ever.
I have to agree with Beyond:
I don't see any semblance to a cave! :shock:
  • What a bunch of troglodytes!
Cave, n. [F. cave, L. cavus hollow, whence cavea cavity.]
  • 1. A hollow place in the earth, either natural or artificial; a subterraneous cavity; a cavern; a den.

    2. Any hollow place, or part; a cavity. [Obs.] "The cave of the ear." Bacon.
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Re: APOD: Sh2 155: The Cave Nebula (2013 Oct 19)

Post by bactame » Sat Oct 19, 2013 12:50 pm

Astronomer's are Platonist's so they have lots of ideas. Socrates had a whole Parable on a Cave. Unfortunately when you went in all the ideas you ran into were bright and shiny.
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Re: APOD: Sh2 155: The Cave Nebula (2013 Oct 19)

Post by Beyond » Sat Oct 19, 2013 12:57 pm

starsurfer wrote:Yay Jimmy Walker's finally got an APOD! :D
Yes, but he should change the color of the words that are in light-grey(?) on his home-page, so they are more easily readable. :yes:
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Re: APOD: Sh2 155: The Cave Nebula (2013 Oct 19)

Post by Beyond » Sat Oct 19, 2013 12:59 pm

neufer wrote:
Image
orin stepanek wrote:
Beyond wrote:
I don't see any resemblance to a cave, what-so-ever.
I have to agree with Beyond:
I don't see any semblance to a cave! :shock:
  • What a bunch of troglodytes!
Cave, n. [F. cave, L. cavus hollow, whence cavea cavity.]
  • 1. A hollow place in the earth, either natural or artificial; a subterraneous cavity; a cavern; a den.

    2. Any hollow place, or part; a cavity. [Obs.] "The cave of the ear." Bacon.
I 'cave-in' at trying to grasp the meaning of this post. :yes:
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Re: APOD: Sh2 155: The Cave Nebula (2013 Oct 19)

Post by neufer » Sat Oct 19, 2013 1:10 pm

Click to play embedded YouTube video.
bactame wrote:
Astronomer's are Platonist's so they have lots of ideas.

Socrates had a whole Parable on a Cave.

Unfortunately when you went in all the ideas you ran into were bright and shiny.
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Re: APOD: Sh2 155: The Cave Nebula (2013 Oct 19)

Post by BMAONE23 » Sat Oct 19, 2013 3:36 pm

orin stepanek wrote:I have to agree with Beyond: I don't see any semblance to a cave! :shock:
Rotate the image 90deg counterclockwise and the cave will appear
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Re: APOD: Sh2 155: The Cave Nebula (2013 Oct 19)

Post by geckzilla » Sat Oct 19, 2013 3:46 pm

BMAONE23 wrote:
orin stepanek wrote:I have to agree with Beyond: I don't see any semblance to a cave! :shock:
Rotate the image 90deg counterclockwise and the cave will appear
Hey... wait a minute...
Click to view full size image 1 or image 2
mcdonaldsarchnebula2.jpg
mcdonaldsarchnebula2.jpg (70.49 KiB) Viewed 4220 times
mcdonaldsarchnebula1.jpg
mcdonaldsarchnebula1.jpg (71.79 KiB) Viewed 4220 times
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Re: APOD: Sh2 155: The Cave Nebula (2013 Oct 19)

Post by Beyond » Sat Oct 19, 2013 4:00 pm

Nope :!: Still no cave. Perhaps if there was a photo from an old antique telescope with a lot less definition :?:
And...
I'll have an extra large fries and strawberry shake with the Big Mac. :chomp: :content:
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Re: APOD: Sh2 155: The Cave Nebula (2013 Oct 19)

Post by Psnarf » Sat Oct 19, 2013 5:24 pm

Suitable APOD for the Halloween Season: the Cave Nebula Wizard.
CaveNebula.Wizard.jpg
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Re: APOD: Sh2 155: The Cave Nebula (2013 Oct 19)

Post by geckzilla » Sat Oct 19, 2013 6:10 pm

I see Death's scythe in that cropped view, Psnarf.
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Re: APOD: Sh2 155: The Cave Nebula (2013 Oct 19)

Post by Beyond » Sat Oct 19, 2013 6:59 pm

Sigh, i don't.
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Re: APOD: Sh2 155: The Cave Nebula (2013 Oct 19)

Post by rstevenson » Sat Oct 19, 2013 7:01 pm

I seem to be in Beyonder Land on this too. I'm rarely able to see what others see in these sorts of images. We must be less suggestible than most, B.

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Re: APOD: Sh2 155: The Cave Nebula (2013 Oct 19)

Post by Beyond » Sat Oct 19, 2013 7:09 pm

rstevenson wrote:I seem to be in Beyonder Land on this too. I'm rarely able to see what others see in these sorts of images. We must be less suggestible than most, B.

Rob
Rob, maybe we're just the "sanest" and don't know it? :lol2:
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Re: APOD: Sh2 155: The Cave Nebula (2013 Oct 19)

Post by orin stepanek » Sat Oct 19, 2013 7:29 pm

Beyond wrote:
rstevenson wrote:I seem to be in Beyonder Land on this too. I'm rarely able to see what others see in these sorts of images. We must be less suggestible than most, B.

Rob
Rob, maybe we're just the "sanest" and don't know it? :lol2:
Hey: I see a cave! Oh! That's in Rob's donut! :lol2: 8-) :mrgreen: :wink: :clap: :thumb_up: :yes:
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Re: APOD: Sh2 155: The Cave Nebula (2013 Oct 19)

Post by Ann » Sun Oct 20, 2013 4:06 am

I was going to say I saw a duckie and a horsie, but I changed my mind.

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Re: APOD: Sh2 155: The Cave Nebula (2013 Oct 19)

Post by Anthony Barreiro » Mon Oct 21, 2013 3:17 am

orin stepanek wrote:I have to agree with Beyond: I don't see any semblance to a cave! :shock:
Try this image by Anthony Ayiomamitis.

http://www.perseus.gr/Astro-DSO-Nebulae-Sh2-155-Hab.htm
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Re: APOD: Sh2 155: The Cave Nebula (2013 Oct 19)

Post by Beyond » Mon Oct 21, 2013 3:39 am

Anthony Barreiro wrote:
orin stepanek wrote:I have to agree with Beyond: I don't see any semblance to a cave! :shock:
Try this image by Anthony Ayiomamitis.

http://www.perseus.gr/Astro-DSO-Nebulae-Sh2-155-Hab.htm
Well, there does seem to be a cave type area on the right side, but i can't tell if the picture is the same as the APOD.
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Re: APOD: Sh2 155: The Cave Nebula (2013 Oct 19)

Post by Anthony Barreiro » Mon Oct 21, 2013 5:50 am

Beyond wrote:
Anthony Barreiro wrote:
orin stepanek wrote:I have to agree with Beyond: I don't see any semblance to a cave! :shock:
Try this image by Anthony Ayiomamitis.

http://www.perseus.gr/Astro-DSO-Nebulae-Sh2-155-Hab.htm
Well, there does seem to be a cave type area on the right side, but i can't tell if the picture is the same as the APOD.
It's Sh2-155, the same emission nebula, just a monochrome picture of a wider field.
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