Pelican Nebula in narrowband (IC5070)

[OriolLehmkuhl]

Hi folk!

We would like to show you our version of the Pelican Nebula. The photo was taken with narrowband filters using the Hubble palette ([SII]Ha[OIII]).

We have taken 15x10 min subframes for Ha with 7nm Baader filter (binning 1x1), 6x15 min for SII (binning 2x2) and 8x15 min (binning 2x2) for OIII. We have used a C80ED on Sphinx SXD mount and Artemis 4021 and guided through a Zenithstar 66 f5.9 with a Meade DSI using PhD guiding. Calibration was made with ImagePlus and all the processing with PixInsight.

Comments are welcome.



For a larger size: http://www.astrosurf.com/brego-sky/images/peliLarge.jpg


Clear skys,

Oriol and Ivette

[C. Sonnenstein]

That's very nice, congratulations!!

I see that you have defined a Hubble color palette. Take a look with this PixelMath expresion:

Code: [Select]

SII + 0.78*Ha
0.15*Ha + OIII
OIII

This pixelmath expression was used for Juan Conejero to assign different weights with SII, Ha and OIII data to NGC 5189 from Gemini Observatory South. Of course you can modify the constant value to assign different color palette. Perhaps this example could be a problem, because the fractions of the SII and Ha raw images sums more than one, so the result could be saturated in some regions. But if you do this step with linear data, it could be no problem at all, and probably you do not loss any significative data.

[Jack Harvey]

Great framing and resolution.  I have seen this image done in the Hubble Pallete many times and think you may be a little too strong in the SII.  An example would be Richard Crisp's from a few years ago:

http://www.narrowbandimaging.com/images/IC5070_st10_registar_s2hao3_small.jpg

Other than that a great image and if you try using Pixel Math to set the ratios please post an update.

[OriolLehmkuhl]

Thanks for your comments.

Jack, is true than most of the Hubble Palette images we have seen of that area are more blue/green in the outer nebula regions. In fact, in our site we have another image that looks to me to be more like what you say:

http://www.astrosurf.com/brego-sky/nebulae/slides/Pelican(IC5070).jpg

But in this version we've been inspired in an APOD of Antonio Fernandez,  http://apod.nasa.gov/apod/ap071019.html , but of course ours is not as good  as him.

[Jordi Gallego]

Very nice narrowband image Ivette and Oriol, congratulations :wink:

Regards
Jordi

[GABRI 9555]

Hello yvete and oriol, a magnificent picture, I personally i love the color, congratulations.

regard