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Bubble Nebula and friends in HST palette

GordonH

By GordonH
in Imaging - Deep Sky

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GordonH

GordonH

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Hi

I thought I would post this even though I am planning on adding more data later to smooth the image a bit better. It is a wide field of the following DSOs

NGC7635 - AKA Bubble nebula

M52

NGC7538

NGC7510

Sh2-157 - "Lobster Claw" nebula

Sh2-161

There may be more in there but I haven't had time to look any further

I took this over 2 nights with 8x20 minutes Ha and OIII and 10x20 minutes SII. There was a period of poor seeing last night when doing the SII data courtesy of some thin misty cloud going overhead for about an hour. It was taken with the Takahashi FSQ106ED at f5 with Starlight Xpress H36 on a Paramount ME auto guided with an OAG and Lodestar camera.

I have tried the Bubble nebula several times before, both with small and large field of view all of which can be seen in the picture gallery on my website http://www.imagingtheheavens.co.uk this is the widest I have gone and gives a bit more context to size.

I have posted a larger version 2400 pixels wide at

NGC7635 (Bubble nebula) and neighbours in HST palette photo - Gordon Haynes photos at pbase.com

Thanks for looking

Best wishes

Gordon

post-13589-133877471843_thumb.jpg

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Mel

Mel

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Wow - the bubble in the large version is well worth a look - it's truly like a jewel on a cushion. Also, the lobster claw nebula is not one you see alot of. Unusual but pleasing colour scheme as well. Thanks Gordon.

Iain

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GordonH

GordonH

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WOW! so much going on!

So this might be a stupid question but is the hubble palette more acurate to what we would see with the eye if we were close to it? as oppose to say a DSLR CCD?

Thanks for sharing Gordon! :)

Michael

Hi Michael

Even if you were up close to you it you still would have difficulty in seeing it, this is because the objects are all relatively faint. Think of it this way in that the eye and brain together process the information of what we see about 100 times a second which effectively puts the exposure time of the eye at about 1/100th of a second. this image was taken with a highly sensitive specialist camera with sub exposures of 20 minutes each which is 120,000 times more exposure than that of our eyes, add to this that the camera is more sensitive than our eyes anyway. This is further compounded at night in that our eyes are not very sensitive to colour so even with a powerful telescope to assist us the most we would ever see would be shades of grey.

If we could see all these "colourful" nebula in all their glory then I am afraid they would all appear red or reddish, this is because of the abundance of hydrogen compared to other elements and hydrogen emits energy in the red end of the spectrum. As mentioned earlier and on other forums narrow band imaging shows false colouration in that in the case of the HST palette SII is assigned to Red, Ha to Green and OIII to Blue. Both hydrogen and sulphur emit in the red end of the spectrum but sulphur is assigned to red and hydrogen to green because that is the correct order of wavelength so it is correct to assign them this way from a scientific point of view. As mentioned narrow band and HST imaging doesn't intend or pretend to portray a true colour representation of an image, it intends to show the different ionisation structures within the nebula in the form of colour differentiation, at the same time it also produces a more exciting looking picture

Best wishes

Gordon

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msinclairinork

msinclairinork

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Thank you for your response makes perfect sense.

So just to clarifiy when the star trek enterprise is fleeing from an enemy and decides to run for cover in a near by nebulae that is full of all different colours...thats actualy not what they would see. it would either be likely gray or red?

Sorry for the poor metafor, all i could think of lol :)

Michael

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GordonH

GordonH

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Hi Michael

It would be neither because there would be so much lethal ultra-violet and other radiation there as well as intense heat because you have to remember these are star forming regions that the enterprise along with captain kirk would be vapourised long before they could get inside the nebula.

On a more serious note if your eyes were sensitive enough and you could get that close the nebula would appear very much like they would if you took the image with standard RGB filters or a DSLR because we can only see colours in RGB which is visible light

Best wishes

Gordon

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RobH

RobH

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Fantastic stuff Gordon.

I never knew that the region was so rich, and your rendition of the HST pallette brings the whole thing out beautifully :)

BTW....the Enterprise would be ok hiding in a nebula.....they have shields :)

Cheers

Rob

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GordonH

GordonH

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Fantastic stuff Gordon.

I never knew that the region was so rich, and your rendition of the HST pallette brings the whole thing out beautifully :)

BTW....the Enterprise would be ok hiding in a nebula.....they have shields :hello2:

Cheers

Rob

Hi Rob

Do you know? You lot will believe anything you see on television, and besides the shields would have been damaged beyond repair by the altercation with the Romulan war bird that they were fighting with:evil6::):evil6:

Best wishes

Gordon

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GordonH

GordonH

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But Spock and Scotty would have fixed the shields at the last minute Gordon :):D:D

Hi Rob

Sorry mate, you have the wrong crew, it would have been Geordie La Forge and Data, it was the klingons that plagued Kirk and Scotty. The Romulans didn't really appear until Jean Luc Picard took over the helm

:)

Best wishes

Gordon

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RobH

RobH

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Time warp Gordon....it explains all!!

Cheers

Rob

Hi Rob

Sorry mate, you have the wrong crew, it would have been Geordie La Forge and Data, it was the klingons that plagued Kirk and Scotty. The Romulans didn't really appear until Jean Luc Picard took over the helm

:)

Best wishes

Gordon

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