CG4 - Cometary Globule 4 like you never saw before

[PhotonCollector]

check this out - something I have not seen before.


CG4 and all the nebula associated with it !


this is a wide field image (about 2.25° x 1.5°) with the 4.3" refractor operating at f/4.7 with the reducer mk III. Exposure 88-minutes with Houghys cooled 400D.


Better resolution image and imaging details
goto http://www.skylab.com.au/pmsa/CometaryGlobule_CG4.html


regards

[Ric]

Hi Paul, what an amazing capture. That poor little galaxy is nearly lost in all those stars but the detail in CG4 is certainly wonderful.

Houghy's camera really does the trick.

Cheers

[glenc]

Thanks Paul a very interesting and well taken image.
I just compared it with Guide v8, NGC 2427 is mag 12.2 and PGC 21338 is mag 14.4.
The nebula is also known as GN 07.29.8.

[iceman]

Lots of interesting stuff there, Paul. Great image.

[Alchemy]

the cooled camera seems to be remarkably sensitive with the Ha ,..... just copied the image details for others to see the exposure times etc,

it makes imaging more fascinating when you can capture the faint details.
well done.
ImageThe Norma Nebula NGC6288 and NGC6164-5Catalog20080411TelescopeWilliam Optics 110mm f/4.7 APO Refractor telescope on
observatory mounted Losmandy G-11 equatorial mount with Gemini 4.GuidingAutoguided with SBIG 402 on Orion ST-80 f/5 guidescope with CCDOps.CameraCentral DS Cooled Canon EOS 400D Digital.
Exposures11 x 8-minute exposures @ ISO 800.Total Exposure time88-minutes.Filter/equipmentAstronomik 2" CLS filter,
WO 0.8x Field reducer/corrector Mk III.ProcessingDarks, bias and flat-fielded with ImagesPlus,
post processing in Photoshop.NotesFocused with DSLR Focus. FOV is 145' x 96' = 2.25° x 1.5°

[h0ughy]

its actually a 350D :)

Mighty effort Paul!!

[Doomsayer]

Sorry isn't CG4 in Puppis and is famously known as "The Hand of God"?
With very dark skies, black shroud and large aperture it is possible detect visually.... Excellent effort with a DSLR none-the-less. There's a bunch of other small CG's in that region of the sky.
guy

[alan meehan]

a very good shot paul ,dont tell me houghy got a cooled 400d now WOW

[h0ughy]

http://apod.nasa.gov/apod/ap060314.html i think its a lovely CG4 - remember this image was created with a lot more exposure time than pauls shot.

as for the official description:

The flower-like image of this star-forming region in Earth’s southern skies was imaged using a 64-megapixel Mosaic imaging camera on the National Science Foundation’s Victor M. Blanco telescope at Cerro Tololo Inter-American Observatory.

Cometary globules are isolated, relatively small clouds of gas and dust within the Milky Way. This example, called CG4, is about 1,300 light years from Earth. Its head is some 1.5 light-years in diameter, and its tail is about eight light-years long. The dusty cloud contains enough material to make several Sun-sized stars. CG4 is located in the constellation of Puppis.

The head of the nebula is opaque, but glows because it is illuminated by light from nearby hot stars. Their energy is gradually destroying the dusty head of the globule, sweeping away the tiny particles which scatter the starlight. This particular globule shows a faint red glow from electrically charged hydrogen, and it seems about to devour an edge-on spiral galaxy (ESO 257-19) in the upper left. In reality, this galaxy is more than a hundred million light-years further away, far beyond CG4.

The image from the Blanco 4-meter telescope was taken in four filters, three of which are for blue, green and near-infrared light. The fourth is designed to isolate a specific color of red, known as hydrogen-alpha, which is produced by warm hydrogen gas.


so there ya go - I hijacked Pauls thread:help:

So if Mr Mayo imaged this beasty for several weeks - we might just start to get the image shown here. I personally think it is a great image and something worthy of following up one day when I have the skills

[PhotonCollector]

I think my wide-field image is kewl since it shows how big CG4 really is! rather than just the bit that shows the "mouth" about to swallow the galaxy like in the APOD image and in Malins book.

Now i reckon i could get that part of CG4 like in the APOD image with the 12" reflector after the optics return. If they return soon before CG4 gets too low.

cheers mate