Recent Submissions: 2010 June 20-22

See new, spectacular, or mysterious sky images.
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owlice
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Recent Submissions: 2010 June 20-22

Post by owlice » Sun Jun 20, 2010 2:31 am

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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
Rigel_H3_Greg_Noel_Online.jpg
Nice Observatory 2, France
Copyright: Matthieu Conjat
Nice_1.jpg
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owlice
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Re: Recent Submissions: 2010 June 20-22

Post by owlice » Sun Jun 20, 2010 2:31 am

Sun Pillar over the Atlantic Ocean
Copyright: Pedro-Luis Cuadrado
2010-06-13 Pilar solar 600 km al NW de Finisterre.jpg
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Re: Recent Submissions: 2010 June 20-22

Post by owlice » Sun Jun 20, 2010 1:20 pm

Venus, Moon, Pollux and Castor over Istanbul
Copyright: Tunç Tezel
20100614_Tezel.jpg
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Re: Recent Submissions: 2010 June 20-22

Post by owlice » Sun Jun 20, 2010 2:43 pm

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.
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bystander
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Re: Recent Submissions: 2010 June 20-22

Post by bystander » Sun Jun 20, 2010 3:14 pm

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! :wink:

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?

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Re: Recent Submissions: 2010 June 20-22

Post by canopia » Sun Jun 20, 2010 3:25 pm

I think it is because of the colour of the star, it still loks like a reflection nebula.

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Ann
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Re: Recent Submissions: 2010 June 20-22

Post by Ann » Sun Jun 20, 2010 6:01 pm

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:

Image

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.

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Last edited by Ann on Mon Jun 21, 2010 5:52 am, edited 2 times in total.
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Re: Recent Submissions: 2010 June 20-22

Post by owlice » Sun Jun 20, 2010 7:18 pm

NGC292: The Small Magellanic Cloud (SMC)
http://astrosurf.com/emilio/
Copyright: Emilio Rivero
1200P_nube_Maga3prueba.jpg
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Re: Recent Submissions: 2010 June 20-22

Post by Ann » Mon Jun 21, 2010 6:08 am

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.

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bystander
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Re: Recent Submissions: 2010 June 20-22

Post by bystander » Mon Jun 21, 2010 6:33 am

What's the cluster at the bottom, below the SMC?

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Re: Recent Submissions: 2010 June 20-22

Post by Ann » Mon Jun 21, 2010 4:25 pm

That's another globular cluster belonging to our galaxy, NGC 362.

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Re: Recent Submissions: 2010 June 20-22

Post by owlice » Mon Jun 21, 2010 5:03 pm

The Great Dark Horse Nebula in Ophiuchus
http://deepskycolors.com/
Copyright: Rogelio Bernal Andreo
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Re: Recent Submissions: 2010 June 20-22

Post by owlice » Tue Jun 22, 2010 12:52 am

Sagittarius Wide Field, M8, M20 and NGC6559
http://northfront.com/bryan/astronomy/m ... gc6559.htm
Copyright: Bryan Cogdell Larger image here.
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Re: Recent Submissions: 2010 June 20-22

Post by owlice » Tue Jun 22, 2010 1:59 am

Star Trails and Fireflies
http://www.steveirvine.com/astro
Copyright: Steve Irvine
startrailfirefly_irvine.jpg
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Re: Recent Submissions: 2010 June 20-22

Post by owlice » Tue Jun 22, 2010 10:12 am

Conjunction of Moon, Mars, and Regulus with Big Ben
http://ladanyi.csillagaszat.hu
Copyright: Tamas Ladanyi
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Re: Recent Submissions: 2010 June 20-22

Post by owlice » Tue Jun 22, 2010 10:18 am

Variable Star Mu Cephei
http://www.galacticimages.com
Copyright: John Chumack
Mu Cephei_XsiChumack_HRweb.jpg
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Re: Recent Submissions: 2010 June 20-22

Post by wonderboy » Tue Jun 22, 2010 10:32 am

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.


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Re: Recent Submissions: 2010 June 20-22

Post by geckzilla » Tue Jun 22, 2010 11:35 am

owlice wrote:Star Trails and Fireflies
http://www.steveirvine.com/astro
Copyright: Steve Irvine
startrailfirefly_irvine.jpg
I like this one a lot. Very creative.
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owlice
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Re: Recent Submissions: 2010 June 20-22

Post by owlice » Tue Jun 22, 2010 12:54 pm

geckzilla wrote:I like this one a lot. Very creative.
I like it, too! It really captures a summer feel. I actually laughed (with delight) when I first saw it and read the title!
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Re: Recent Submissions: 2010 June 20-22

Post by owlice » Tue Jun 22, 2010 1:01 pm

Cygnus Deep Widefield
http://www.schursastrophotography.com/x ... deep1.html
Copyright: Chris Schur
Cygnus3h25mF1600_60.jpg
Largest image here.
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Re: Recent Submissions: 2010 June 20-22

Post by owlice » Tue Jun 22, 2010 1:16 pm

IC 5146: The Cocoon Nebula
http://www.caelumobservatory.com/gallery/ic5146.shtml
Credit and Copyright: Adam Block/Mount Lemmon SkyCenter/University of Arizona
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Re: Recent Submissions: 2010 June 20-22

Post by owlice » Tue Jun 22, 2010 1:22 pm

Star trail from Southern Pole to Northern Pole
http://www.astrosurf.com/sguisard/Pagim ... _pole.html
Copyright: Stéphane Guisard
From-pole-to-pole-1200x800-cp8.jpg
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Re: Recent Submissions: 2010 June 20-22

Post by Ann » Tue Jun 22, 2010 3:24 pm

The Great Dark Horse Nebula in Ophiuchus
The Snake Nebula is in there. And the brightest blue star is Theta Ophiuchi, spectral class B2IV.

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