Recent Submissions: 2010 June 20-22
Recent Submissions: 2010 June 20-22
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Please click on each image for best viewing; please click on the link below the
image title for more information about the image. Thank you!
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<- Previous submissions
IC1396 in Cepheus
http://www.astrociap.com
Copyright: Stefano Ciapetti Rigel in Orion
Copyright: Noel Carboni and Greg Parker Nice Observatory 2, France
Copyright: Matthieu Conjat
Please click on each image for best viewing; please click on the link below the
image title for more information about the image. Thank you!
_____________________________________________________________________________
<- Previous submissions
IC1396 in Cepheus
http://www.astrociap.com
Copyright: Stefano Ciapetti Rigel in Orion
Copyright: Noel Carboni and Greg Parker Nice Observatory 2, France
Copyright: Matthieu Conjat
A closed mouth gathers no foot.
Re: Recent Submissions: 2010 June 20-22
Sun Pillar over the Atlantic Ocean
Copyright: Pedro-Luis Cuadrado
Copyright: Pedro-Luis Cuadrado
A closed mouth gathers no foot.
Re: Recent Submissions: 2010 June 20-22
Venus, Moon, Pollux and Castor over Istanbul
Copyright: Tunç Tezel
Copyright: Tunç Tezel
A closed mouth gathers no foot.
Re: Recent Submissions: 2010 June 20-22
IC4601: Reflection Nebula in Scorpius
http://www.caelumobservatory.com/gallery/ic4601.shtml
Credit and Copyright: Adam Block/Mount Lemmon SkyCenter/University of Arizona Larger image here.
http://www.caelumobservatory.com/gallery/ic4601.shtml
Credit and Copyright: Adam Block/Mount Lemmon SkyCenter/University of Arizona Larger image here.
A closed mouth gathers no foot.
Re: Recent Submissions: 2010 June 20-22
Rigel in Orion
Copyright: Noel Carboni and Greg Parker
It looks so majestic, all alone. Great shot, Noel!
Nice Observatory 2, France
Copyright: Matthieu Conjat
Another Nice photo!
IC4601: Reflection Nebula in Scorpius
Credit and Copyright: Adam Block/Mount Lemmon SkyCenter/University of Arizona
Is that an emission nebula in the lower right, or is the color of the star affecting the color of the reflection?
Copyright: Noel Carboni and Greg Parker
It looks so majestic, all alone. Great shot, Noel!
Nice Observatory 2, France
Copyright: Matthieu Conjat
Another Nice photo!
IC4601: Reflection Nebula in Scorpius
Credit and Copyright: Adam Block/Mount Lemmon SkyCenter/University of Arizona
Is that an emission nebula in the lower right, or is the color of the star affecting the color of the reflection?
Re: Recent Submissions: 2010 June 20-22
I think it is because of the colour of the star, it still loks like a reflection nebula.
Re: Recent Submissions: 2010 June 20-22
That's a reflection nebula.
Since blue light scatters much more efficiently than yellow and red light, reflection nebulae are usually blue. But not always, because it also depends on the color of the star whose light is being scattered. The white-looking star at bottom right of the picture of IC 4601 is a K0III star, a so-called orange giant, and it emits proportionally much less blue light than the Sun. Its yellow light doesn't scatter so efficently, but there are copious amounts of it. The small amount of blue light it emits is scattered very efficently, but since there isn't much of it to scatter in the first place, the color of the reflection nebulae will be white. By contrast, the stars surrounded by the blue reflection nebulae are of spectral class B and A. Therefore they contain much more blue light than the Sun, and this blue light will scatter very efficiently, making their reflection nebuale very blue.
Take a look at these colorful nebulae surrounding the Antares and Rho Ophiuchi region:
At bottom left of this image, you can see "red" (really orange-yellow) supergiant Antares. It emits extremely little blue light and copious amounts of yellow, orange and red light, so its reflected light will look yellow (since yellow light will scatter much more efficently than orange, let alone red light). At right is a blue star with a remarkable "wall" of pink light on its right side. This "wall" is made of hydrogen which has been "piled up" because of the strong stellar wind from the hot blue star of spectral class O. The pink "wall" glows reddish because of hydrogen emission, so it's an emission nebula. At top is Rho Ophiuchi itself, a multiple star of spectral class B, and it is surrounded by a very large and very blue reflection nebula. Rho Ophiuchi emits copious amounts of blue light which will scatter very efficiently, but these stars are not hot enough to make the surrounding hydrogen glow pink from emission.
Ann
Since blue light scatters much more efficiently than yellow and red light, reflection nebulae are usually blue. But not always, because it also depends on the color of the star whose light is being scattered. The white-looking star at bottom right of the picture of IC 4601 is a K0III star, a so-called orange giant, and it emits proportionally much less blue light than the Sun. Its yellow light doesn't scatter so efficently, but there are copious amounts of it. The small amount of blue light it emits is scattered very efficently, but since there isn't much of it to scatter in the first place, the color of the reflection nebulae will be white. By contrast, the stars surrounded by the blue reflection nebulae are of spectral class B and A. Therefore they contain much more blue light than the Sun, and this blue light will scatter very efficiently, making their reflection nebuale very blue.
Take a look at these colorful nebulae surrounding the Antares and Rho Ophiuchi region:
At bottom left of this image, you can see "red" (really orange-yellow) supergiant Antares. It emits extremely little blue light and copious amounts of yellow, orange and red light, so its reflected light will look yellow (since yellow light will scatter much more efficently than orange, let alone red light). At right is a blue star with a remarkable "wall" of pink light on its right side. This "wall" is made of hydrogen which has been "piled up" because of the strong stellar wind from the hot blue star of spectral class O. The pink "wall" glows reddish because of hydrogen emission, so it's an emission nebula. At top is Rho Ophiuchi itself, a multiple star of spectral class B, and it is surrounded by a very large and very blue reflection nebula. Rho Ophiuchi emits copious amounts of blue light which will scatter very efficiently, but these stars are not hot enough to make the surrounding hydrogen glow pink from emission.
Ann
Last edited by Ann on Mon Jun 21, 2010 5:52 am, edited 2 times in total.
Color Commentator
Re: Recent Submissions: 2010 June 20-22
A closed mouth gathers no foot.
Re: Recent Submissions: 2010 June 20-22
Nice! I like the contrast between the somewhat loose blue dwarf galaxy and the compact yellow globular cluster. Of course, the globular cluster, 47 Tucanae, belongs to our own galaxy and not to the Small Magellanic Cloud, so the proximity between these two collections of stars is just a line of sight thing. It's iteresting that the globular cluster is the second biggest and richest in our galaxy after Omega Centauri.
Ann
Ann
Color Commentator
Re: Recent Submissions: 2010 June 20-22
What's the cluster at the bottom, below the SMC?
Re: Recent Submissions: 2010 June 20-22
That's another globular cluster belonging to our galaxy, NGC 362.
Ann
Ann
Color Commentator
Re: Recent Submissions: 2010 June 20-22
A closed mouth gathers no foot.
Re: Recent Submissions: 2010 June 20-22
Sagittarius Wide Field, M8, M20 and NGC6559
http://northfront.com/bryan/astronomy/m ... gc6559.htm
Copyright: Bryan Cogdell Larger image here.
http://northfront.com/bryan/astronomy/m ... gc6559.htm
Copyright: Bryan Cogdell Larger image here.
A closed mouth gathers no foot.
Re: Recent Submissions: 2010 June 20-22
A closed mouth gathers no foot.
Re: Recent Submissions: 2010 June 20-22
Conjunction of Moon, Mars, and Regulus with Big Ben
http://ladanyi.csillagaszat.hu
Copyright: Tamas Ladanyi
http://ladanyi.csillagaszat.hu
Copyright: Tamas Ladanyi
A closed mouth gathers no foot.
Re: Recent Submissions: 2010 June 20-22
A closed mouth gathers no foot.
- wonderboy
- Commander
- Posts: 570
- Joined: Sun Jan 31, 2010 11:57 am
- AKA: Paul
- Location: Glasgow, Scotland
Re: Recent Submissions: 2010 June 20-22
owlice wrote:The Great Dark Horse Nebula in Ophiuchus
http://deepskycolors.com/
Copyright: Rogelio Bernal Andreo
Looks more like there is a black elephant in the nebula. its facing left and you can see its trunk.
Paul.
"I'm so fast that last night I turned off the light switch in my hotel room and was in bed before the room was dark" Muhammad Ali, faster than the speed of light?
- geckzilla
- Ocular Digitator
- Posts: 9180
- Joined: Wed Sep 12, 2007 12:42 pm
- Location: Modesto, CA
- Contact:
Re: Recent Submissions: 2010 June 20-22
I like this one a lot. Very creative.
Just call me "geck" because "zilla" is like a last name.
Re: Recent Submissions: 2010 June 20-22
I like it, too! It really captures a summer feel. I actually laughed (with delight) when I first saw it and read the title!geckzilla wrote:I like this one a lot. Very creative.
A closed mouth gathers no foot.
Re: Recent Submissions: 2010 June 20-22
Cygnus Deep Widefield
http://www.schursastrophotography.com/x ... deep1.html
Copyright: Chris Schur Largest image here.
http://www.schursastrophotography.com/x ... deep1.html
Copyright: Chris Schur Largest image here.
A closed mouth gathers no foot.
Re: Recent Submissions: 2010 June 20-22
IC 5146: The Cocoon Nebula
http://www.caelumobservatory.com/gallery/ic5146.shtml
Credit and Copyright: Adam Block/Mount Lemmon SkyCenter/University of Arizona
http://www.caelumobservatory.com/gallery/ic5146.shtml
Credit and Copyright: Adam Block/Mount Lemmon SkyCenter/University of Arizona
A closed mouth gathers no foot.
Re: Recent Submissions: 2010 June 20-22
Star trail from Southern Pole to Northern Pole
http://www.astrosurf.com/sguisard/Pagim ... _pole.html
Copyright: Stéphane Guisard
http://www.astrosurf.com/sguisard/Pagim ... _pole.html
Copyright: Stéphane Guisard
A closed mouth gathers no foot.
Re: Recent Submissions: 2010 June 20-22
The Snake Nebula is in there. And the brightest blue star is Theta Ophiuchi, spectral class B2IV.The Great Dark Horse Nebula in Ophiuchus
Ann
Color Commentator