APOD: Nebulae in the Northern Cross (2010 Nov 19)

APOD Robot · Post by **APOD Robot** » Fri Nov 19, 2010 5:06 am

Nebulae in the Northern Cross

Explanation: Explore a beautiful and complex region of nebulae strewn along the plane of our Milky Way Galaxy in this widefield skyscape. The image emphasizes cosmic gas clouds in a 25 by 25 degree view centered on the Northern Cross, the famous asterism in the constellation Cygnus. Bright, hot, supergiant star Deneb at the top of the cross, Sadr near the center, and beautiful Albireo run diagonally through the scene. Popular telescopic tour destinations such as the North America and Pelican emission regions, the Butterfly Nebula (IC 1318), and the Crescent and Veil nebulae can be identified by placing your cursor over the image. Silhouetted by the glowing interstellar clouds and crowded star fields, the dark Northern Coal Sack also stands out, part of a series of obscuring dust clouds forming the Great Rift in the Milky Way. These Northern Cross nebulosities are all located about 2,000 light-years away. Along with the Sun, they lie within the Orion spiral arm of our galaxy.

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neufer · Post by **neufer** » Fri Nov 19, 2010 6:49 am

: Looking down the Orion Arm at[b][color=#FF0000] NGC 6888 the Crescent Nebula[/color][/b]

http://antwrp.gsfc.nasa.gov/apod/ap080424.html
http://antwrp.gsfc.nasa.gov/apod/ap091027.html
http://antwrp.gsfc.nasa.gov/apod/ap081107.html

http://antwrp.gsfc.nasa.gov/apod/ap060706.html
http://antwrp.gsfc.nasa.gov/apod/ap071111.html
http://antwrp.gsfc.nasa.gov/apod/ap080813.html

http://antwrp.gsfc.nasa.gov/apod/ap090915.html
http://antwrp.gsfc.nasa.gov/apod/ap000802.html
http://antwrp.gsfc.nasa.gov/apod/ap031016.html

http://antwrp.gsfc.nasa.gov/apod/ap081113.html

http://asterisk.apod.com/vie ... 00#p133700

bystander · Post by **bystander** » Fri Nov 19, 2010 12:58 pm

http://asterisk.apod.com/vie ... 97#p136897

Redbone · Post by **Redbone** » Fri Nov 19, 2010 1:12 pm

It looks like a reflection on a lake.

biddie67 · Post by **biddie67** » Fri Nov 19, 2010 1:47 pm

Awesome photo!! As a person new to sky-watching, I really appreciate two items included in the description since I have struggled to figure out what feature is outside the Milky Way or located where inside the Milky Way.

Both the overlay and the "Orion spiral arm" link were very helpful. Thanks.

orin stepanek · Post by **orin stepanek** » Fri Nov 19, 2010 2:06 pm

Cool photo! I couldn't look up into the sky and find the Northern Cross. My eye's just aren't good enough to make out the star pattern of this constellation.

Thanks

neufer · Post by **neufer** » Fri Nov 19, 2010 4:05 pm

APOD Robot wrote: Nebulae in the Northern Cross

http://en.wikipedia.org/wiki/Kepler_Mission wrote:
The photometer's field of view in the constellations Cygnus, Lyra and Draco
Kepler Mission search in context of Milky Way galaxy
<<The Kepler Mission is a NASA space observatory designed to discover Earth-like planets orbiting other stars. The spacecraft was launched on March 7, 2009. With a planned mission lifetime of at least 3.5 years, Kepler uses a photometer developed by NASA to continuously monitor the brightness of over 145,000 main sequence stars in a fixed field of view. The data collected from these observations will be analyzed to detect periodic fluctuations that indicate the presence of extrasolar planets (planets outside our solar system) that are in the process of crossing the face of other stars. The Kepler Mission is currently in active operation, with the first main results announced on 4 January 2010. As expected, the initial discoveries were all short-period planets, with longer period planets expected later. The first six weeks of data revealed five previously unknown planets, all very close to their stars. Among the notable results are one of the least dense planets yet found, and two low-mass white dwarf stars that were initially reported as being members of a new class of stellar objects.>>

raybun · Post by **raybun** » Fri Nov 19, 2010 4:38 pm

When you have an APOD that requires a mouse over event like this one has, why can't you remove the pop up from the code when someone puts thier mouse over the APOD image. It's quite annoying at times. Just my 2 cents...

Chris Peterson · Post by **Chris Peterson** » Fri Nov 19, 2010 4:52 pm

raybun wrote:When you have an APOD that requires a mouse over event like this one has, why can't you remove the pop up from the code when someone puts thier mouse over the APOD image. It's quite annoying at times. Just my 2 cents...

What you are seeing is the ALT text for the image, which is REQUIRED by web standards. The problem is, you should not be seeing it as a popup. This indicates you are using a non-compliant browser, such as Internet Explorer. If you view the APOD with a fully compliant browser like Firefox, there will be no popup of this information unless you have the display of images disabled.

friarslantern · Post by **friarslantern** » Fri Nov 19, 2010 7:57 pm

I don't remember seeing so much red in the night sky across such a large area. Could this photo be color-enhanced, or am I mistaken?
Tim Reeves,
Berkeley, Calif.

biddie67 · Post by **biddie67** » Fri Nov 19, 2010 9:32 pm

The wiki article about the Kepler Mission was interesting. It seemed to be saying that altho' the area that the cameras are pointing are considered rich in possibilites for locating exoplanets, the greater advantages for pointing in that direction was the many logistical pluses for maintaining the steadiness of the cameras in orbit.

Thanks .....

Ann · Post by **Ann** » Sat Nov 20, 2010 5:51 am

friarslantern wrote:I don't remember seeing so much red in the night sky across such a large area. Could this photo be color-enhanced, or am I mistaken?
Tim Reeves,
Berkeley, Calif.

This picture is strongly hydrogen alpha enhanced, to bring out all the emission nebulosity that exists in this part of the sky, and which is normally much too faint and tenuous to show up in photographs.

I think that this part of the sky, the Cygnus region, is where inner spiral arms "bend inwards", so that we see emission nebulae at many different depths along our line of sight right here. I think that this part of the sky is where we find really massive star forming regions of our galaxy, but deeper inside the disk and closer to the center than we are. I think that Cygnus OB2 and Cygnus OB5 may be examples of such star forming regions.

Ann

geissi · Post by **geissi** » Sat Nov 20, 2010 7:54 am

Hi,

I'm Rolf, author of the Cygnus-APOD.
Thanks a lot for your kind replies.

Could this photo be color-enhanced, or am I mistaken?

This image is strongly color-enhanced by using a slightly modified tone-mapping method by J-P Metsaväinio.
The RGB-image only was used for star color enhancement.
All nebula-colors have been created out of b/w narrowband subframes.
As I'm imaging from a small balcony with heavy light-pollution, that's the only way to
obtain deep nebula images - but this works fine.

The mapping was:
H-alpha = light-red
OIII = cyan
SII = deep red
RGB = natural color only for the stars

Here's some more data:
http://www.stern-fan.de/Seiten/galerie_ ... -80mm.html

Regards

Rolf Geissinger
Remseck, Germany
http://www.stern-fan.de

DavidLeodis · Post by **DavidLeodis** » Sat Nov 20, 2010 1:47 pm

Excellent image, to which the annotated version was very useful as I doubt I would have located some of the objects. The Northern Coal Sack is however not marked on the annotated version, so am I right in thinking it is the darkish area just to the right of Deneb

Thanks for any help.

neufer · Post by **neufer** » Sat Nov 20, 2010 3:25 pm

DavidLeodis wrote:
Excellent image, to which the annotated version was very useful as I doubt I would have located some of the objects. The Northern Coal Sack is however not marked on the annotated version, so am I right in thinking it is the darkish area just to the right of Deneb Thanks for any help.

Butterfly coal miners
kerosene lamp

Yes. The Butterfly is hovering over The Northern Coal Sack.

APOD Robot wrote: Nebulae in the Northern Cross

http://apod.nasa.gov/apod/ap070920.html
http://apod.nasa.gov/apod/ap031023.html

DavidLeodis · Post by **DavidLeodis** » Sat Nov 20, 2010 5:45 pm

neufer wrote:
DavidLeodis wrote:
Excellent image, to which the annotated version was very useful as I doubt I would have located some of the objects. The Northern Coal Sack is however not marked on the annotated version, so am I right in thinking it is the darkish area just to the right of Deneb Thanks for any help.

Butterfly coal miners
kerosene lamp
Yes. The Butterfly is hovering over The Northern Coal Sack.
APOD Robot wrote: Nebulae in the Northern Cross
http://apod.nasa.gov/apod/ap070920.html
http://apod.nasa.gov/apod/ap031023.html

Thanks for your help neufer, which is appreciated.

Guest · Post by **Guest** » Sun Nov 21, 2010 6:09 pm

Do you suppose technology exists to manufacture a pair of glasses, or binoculars, that could "transform" the near IR and UV waves into human visible light so we could "see" the colors and enjoy the reds, blues, dust, etc. live?

BMAONE23 · Post by **BMAONE23** » Sun Nov 21, 2010 6:45 pm

Guest wrote:Do you suppose technology exists to manufacture a pair of glasses, or binoculars, that could "transform" the near IR and UV waves into human visible light so we could "see" the colors and enjoy the reds, blues, dust, etc. live?

Probably not. It takes Time to gather enough light to begin to see these structures and anything Hand Held wouldn't be absolutely still enough, or focused on and following a single point in space, to allow for a 15/30/60 second refresh rate to begin to see the details of these structures. Although it would be a great invention, I don't think you would get the result you desire as our eyes refresh the light gathered and sent to our brains 30 times a second. That is just too fast to allow for viewing these fine structures through lenses alone.
You could take a telescope and direct the eyepiece view to a CCD that is hooked directly to a computer for processing and display. With a computerized tracking mount, you could follow a stellar objects slow path accross the sky allowing the CCD to gather the light (through any desired filters) and display the image directly on the moniter.
Probably the closest to your idea though others on this board might have other ideas or methods

Another option might be to take the same computer operated tracking mount and attach a digital camera to it instead. Place the appropriate filter(s) over the lens. Use a cable control remote shutter device and a USB cable to allow direct viewing from the lens through a computer & moniter

Starship Asterisk*

APOD: Nebulae in the Northern Cross (2010 Nov 19)

APOD: Nebulae in the Northern Cross (2010 Nov 19)

NGC 6888: A Wolf-Rayet in swan's clothing.

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