RBA Premium Astrophotography
Posted: December 8th, 2011
Most narrowband+broadband compositions I've seen (usually H-Alpha + RGB or H-Alpha + LRGB) haven't been able to "fix" that, so I decided to give it a try, also expanding the typical already-wide FOV, to hopefully capture and visually document more of what's around.
The image being presented above includes the entire field I photographed, in a 3x1 mosaic, but down here you can see a composition that focuses on the supernova remnant itself:
Successfully combining narrowband data (H-Alpha in this case) and (L)RGB data can be tricky. One of the usual results is that, since H-Alpha data tends to produce very small stars, when combined with broadband data, the resulting image often presents a rather severe ringing around the stars. Also, some conventional techniques rely on mixing H-Alpha with the red (R) and blue (B) data, but in this case, my RGB data was rather poor so I couldn't rely on just this technique. Therefore, for this particular image I followed a number of conventional as well as non-conventional methods that proved to be rather successful in producing an image that visually documents this area of the sky. Also, as usual in many of my recent images, a multi-scale approach dominated post-processing, in particular to bring out the fainter details that hide behind the swarm of stars.
My daughter says this supernova remnant looks like a Christmas tree ornament, although I kind of see a piggy's head instead! :-)[Hide image details]DATENovember, 2011
3 panes mosaic for LRGB: L: 6 x 10', RGB: 6x5' each,
3 panes mosaic for H-Alpha: All combined 56 x 15'
Total: 21.5 hours
Focal: 385mm, f/3.6EQUIPMENTImaging Scope: FSQ 106 EDX w/Reducer
Guide Camera: StarShoot Autoguider
Mount: EM-400SITE & CONDITIONSHenry Coe State Park, DARC Observatory and Montebello OSP, California
Seeing: Extremely poor
Post-Processing: PixInsight & Photoshop
:: 13 Comments
CommentsGreg Parker (Contact, Page), December 13th, 2011, 13:33Simply the best Simeis 147 I have ever seen :)
RBA (Contact, Page), December 15th, 2011, 1:41Hi Greg, glad you like it! I'm very happy the way it turned out.
riccardo de benedictis (Contact, Page), January 5th, 2012, 9:34Truly amazing, congratulations.....
Hello and happy new year
RBA (Contact, Page), January 5th, 2012, 10:14Happy New Year Ric, and thanks for stopping by!
Werner Mehl (Contact, Page), January 10th, 2012, 9:16I spend about 18 hours under the German sky for this object. But this picture is incredible. It is for me like a painting.
Do you give lessons? :-)
Klacsány Imre (Contact, Page), January 15th, 2012, 2:31Perfect job!! Gratulation!!
Paul Duncan (Contact, Page), February 1st, 2012, 19:09Incredible Rogelio!
How you turn the Ha into deep reds and beautiful stars is just remarkable. Shaking my head...
Tom (Contact, Page), September 20th, 2012, 6:23Congratulations on the ROG placing. Super widefield Seimis.
Wolfgang M. Wettlaufer (Contact, Page), October 9th, 2012, 4:49Having been around for decades now admiring those photographic efforts to present the starry sky, it ever more has me admiring what can be achieved with astrophotographers' means in these days! With the brilliance and sharpness achieved, this object's presentation also tells a lot about the dynamic life of the heavenly wonders out there. Very exciting, Rogelio! Again and again, I must stare at your wonderful rendering of the magnificent nebula. (Can the pulsar be located?) As soon as the rain has stopped to wash out the dust of my (south German) sky I will go outside to have a new look at this part of sky that I photographed myself a few days ago. Amazingly, this SNR lies not far from the famous CRAB, with half its distance; this must have been quite an optical show to our ancestors when that 'guest star' blew up .. your photo certainly will help improve the attention of stargazers (as well as the general public, hopefully) for Simeis 147 as well, each time the CRAB comes into focus!
johnny weisenhunt (Contact, Page), October 9th, 2012, 7:20when you enlarge the photo it shows 3 very long? meteor streaks, also in the left-upper field there is a very strange blob of unrecognizable matter??? great picture though keep um coming.
Lloyd (Contact, Page), September 27th, 2013, 20:17I too have an FSQ and am considering an 11000 class chip. Doesn't the image scale with focal reducer result in great undersampling? The pictures say "no", but the calculations say "yes". Thanks for any insight you can provide. Excellent stuff!
RBA (Contact, Page), September 28th, 2013, 5:03Lloyd, the resolution of the FSQ with the reducer and a 11000 sensor is around 4.8 pixels per arcsecond. Do keep in mind this object is pretty large, over 3 degrees.
Tragoolchitr Jittasaiyapan (Contact, Page), November 10th, 2013, 9:48Wow!!! never seen any Sh2-240 that more amazing than this one.
Unbelievable. Thanks for sharing.
budy (Contact, Page), September 5th, 2014, 1:17like a rose....
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