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  4. » Rosetta in H-alpha

 
Rosetta in H-alpha...

Nebulose

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Rosetta in H-alpha sent on January 15, 2017 (16:37) by Stefano_C. 12 comments, 1513 views.

Fotografia della parte centrale della splendida nebulosa rosetta La nebulosa è situata nell'unicorno e si trova assieme ad un ammasso stellare a circa 5000 anni luce da qua. L'immagine è ripresa in banda stretta con un filtro centrato sulla emissione di Idrogeno Alfa Ripresa al CCD su Pentax 75 SDHF (40x400s di cui alcune scartate a causa di strisciate di aerei e meteore) #Nebulose


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avatarsupporter
sent on January 15, 2017 (16:53) | This comment has been automatically translated (show/hide original)

Good job Stefano
Hello

avatarsenior
sent on January 15, 2017 (17:03) | This comment has been automatically translated (show/hide original)

Hello Marzio

Thank you!

I can just add also the filming of RGB data and OIII

avatarjunior
sent on January 15, 2017 (17:43) | This comment has been automatically translated (show/hide original)

Hi Stefano !
Good start !
but those with the streaks do not use them?

avatarsenior
sent on January 15, 2017 (17:52) | This comment has been automatically translated (show/hide original)

It depends, if you are too weigh no

Sull'Ha where Stretching reaches insane values ??I prefer not to go crazy to find a way to eliminate them altogether
With PixInsight I have not found a system that functions to perfection

avatarjunior
sent on January 15, 2017 (17:56) | This comment has been automatically translated (show/hide original)

I see...

I have no idea what sw you use for stacking, if you use DSS, there is the possibility of using
CUTTING-SIGMA KAPPA
This method is used to discard the outlier pixels that can happen due to cosmic rays, aircraft, satellites or other.
They use two parameters: the number of iterations and the multiplication value of the standard deviation (Kappa).
For each iteration is calculated by the average value and the value of Sigma SD draw each pixel.
Each pixel which deviates from the mean value of a quantity equal to kappa * sigma is rejected.
The average value of the remaining pixels is calculated for each position.
source
www.renzodelrosso.com/articoli / dss.htm

I jot them, of course ...

A greeting

Hello

Mauro

avatarsenior
sent on January 15, 2017 (17:59) | This comment has been automatically translated (show/hide original)

No no PixInsight is a bit more sophisticated than DSS but not just the same
The SN ratio on the strips where data are lacking are a little different than the rest of the images and then with stretching you see the unevenness

Then do not ask me why but the eye is great to see the rifled in photographs. If you look hard enough there's still something in this

avatarjunior
sent on January 15, 2017 (18:49) | This comment has been automatically translated (show/hide original)

... But I would not give importance manic ...
we could always groped to killing the -D satellites would give you a hand :-)

avatarsenior
sent on January 15, 2017 (19:24) | This comment has been automatically translated (show/hide original)

Ah it is quiet

hem .. not give me bad ideas that follow you eh!

avatarsupporter
sent on January 15, 2017 (22:20) | This comment has been automatically translated (show/hide original)

Entertainment .. the pentaxino makes good :-) I would love to see integration with RGB :-)

avatarsenior
sent on January 15, 2017 (22:40) | This comment has been automatically translated (show/hide original)

RGB on the go ;-)

Pentax, given the years it .. is a jewel.
Sure it does not collect a lot of light, but has a large optical
I tell you only that the PI deconvolution found stars of FWHM less than two pixels

avatarsupporter
sent on January 15, 2017 (22:57) | This comment has been automatically translated (show/hide original)

You know .. I have that toy 16 years :-)

avatarsenior
sent on January 20, 2017 (14:28) | This comment has been automatically translated (show/hide original)

Magnificent !!! Compliments



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