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

Comments and questions about the APOD on the main view screen.
Post Reply
User avatar
APOD Robot
Otto Posterman
Posts: 5567
Joined: Fri Dec 04, 2009 3:27 am
Contact:
Contact APOD Robot

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.

<< Previous APOD This Day in APOD Next APOD >>
[/b]
Top
User avatar
geckzilla
Ocular Digitator
Posts: 9180
Joined: Wed Sep 12, 2007 12:42 pm
Location: Modesto, CA
Contact:
Contact geckzilla

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?
Just call me "geck" because "zilla" is like a last name.
Top
User avatar
Beyond
500 Gigaderps
Posts: 6889
Joined: Tue Aug 04, 2009 11:09 am
Location: BEYONDER LAND

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.
To find the Truth, you must go Beyond.
Top
Boomer12k
:---[===] *
Posts: 2691
Joined: Sun Apr 22, 2007 12:07 am

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.

:---[===] *
Top
User avatar
Ann
4725 Å
Posts: 13801
Joined: Sat May 29, 2010 5:33 am

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"!

Ann
Color Commentator
Top
starsurfer
Stellar Cartographer
Posts: 5409
Joined: Thu Mar 15, 2012 7:25 pm

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
Top
User avatar
orin stepanek
Plutopian
Posts: 8200
Joined: Wed Jul 27, 2005 3:41 pm
Location: Nebraska

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:
Orin

Smile today; tomorrow's another day!
Top
User avatar
neufer
Vacationer at Tralfamadore
Posts: 18805
Joined: Mon Jan 21, 2008 1:57 pm
Location: Alexandria, Virginia

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.
Art Neuendorffer
Top
bactame
Ensign
Posts: 73
Joined: Sun Jan 24, 2010 10:25 am

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.
Top
User avatar
Beyond
500 Gigaderps
Posts: 6889
Joined: Tue Aug 04, 2009 11:09 am
Location: BEYONDER LAND

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:
To find the Truth, you must go Beyond.
Top
User avatar
Beyond
500 Gigaderps
Posts: 6889
Joined: Tue Aug 04, 2009 11:09 am
Location: BEYONDER LAND

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:
To find the Truth, you must go Beyond.
Top
User avatar
neufer
Vacationer at Tralfamadore
Posts: 18805
Joined: Mon Jan 21, 2008 1:57 pm
Location: Alexandria, Virginia

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.
Art Neuendorffer
Top
User avatar
BMAONE23
Commentator Model 1.23
Posts: 4076
Joined: Wed Feb 23, 2005 6:55 pm
Location: California

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
Top
User avatar
geckzilla
Ocular Digitator
Posts: 9180
Joined: Wed Sep 12, 2007 12:42 pm
Location: Modesto, CA
Contact:
Contact geckzilla

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 4153 times
mcdonaldsarchnebula1.jpg
mcdonaldsarchnebula1.jpg (71.79 KiB) Viewed 4153 times
Just call me "geck" because "zilla" is like a last name.
Top
User avatar
Beyond
500 Gigaderps
Posts: 6889
Joined: Tue Aug 04, 2009 11:09 am
Location: BEYONDER LAND

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:
To find the Truth, you must go Beyond.
Top
User avatar
Psnarf
Science Officer
Posts: 325
Joined: Fri Feb 26, 2010 6:19 pm

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
Top
User avatar
geckzilla
Ocular Digitator
Posts: 9180
Joined: Wed Sep 12, 2007 12:42 pm
Location: Modesto, CA
Contact:
Contact geckzilla

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.
Just call me "geck" because "zilla" is like a last name.
Top
User avatar
Beyond
500 Gigaderps
Posts: 6889
Joined: Tue Aug 04, 2009 11:09 am
Location: BEYONDER LAND

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

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

Sigh, i don't.
To find the Truth, you must go Beyond.
Top
User avatar
rstevenson
Quis custodiet ipsos custodes?
Posts: 2705
Joined: Fri Mar 28, 2008 1:24 pm
Location: Halifax, NS, Canada

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.

Rob
Top
User avatar
Beyond
500 Gigaderps
Posts: 6889
Joined: Tue Aug 04, 2009 11:09 am
Location: BEYONDER LAND

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:
To find the Truth, you must go Beyond.
Top
User avatar
orin stepanek
Plutopian
Posts: 8200
Joined: Wed Jul 27, 2005 3:41 pm
Location: Nebraska

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:
Orin

Smile today; tomorrow's another day!
Top
User avatar
Ann
4725 Å
Posts: 13801
Joined: Sat May 29, 2010 5:33 am

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.

Ann
Color Commentator
Top
User avatar
Anthony Barreiro
Turtles all the way down
Posts: 793
Joined: Wed May 11, 2011 7:09 pm
Location: San Francisco, California, Turtle Island

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
May all beings be happy, peaceful, and free.
Top
User avatar
Beyond
500 Gigaderps
Posts: 6889
Joined: Tue Aug 04, 2009 11:09 am
Location: BEYONDER LAND

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.
To find the Truth, you must go Beyond.
Top
User avatar
Anthony Barreiro
Turtles all the way down
Posts: 793
Joined: Wed May 11, 2011 7:09 pm
Location: San Francisco, California, Turtle Island

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.
May all beings be happy, peaceful, and free.
Top
Post Reply

Return to “The Bridge: Discuss an Astronomy Picture of the Day”