Reprocessing 2022 records focused about M42 region. In this work there’s a main core in LRGB, background removed, SPColorCalibrated, Deconvoltued and denoised is then integrated and boosted by Ha and Oiii narrowband master (Bgremoved, Deconvoluted and denoised) with Ha applied to L and R channel, Oiii to Green and Blue. Final starless and 0.65 stars pixelmath blended and Photoshop retouches.
I found this work not so easy to be done, but I really stoked into. Mostly made in PixInSight I played and LRGB and HOO separated integration, background removing, Spectrophotometric color calibration. I then used Ha to enhace both L and R channel, while Oiii to integrate G and B channel. Extracting starless / stars masters, then is adding stars from LRGB color calibrated master into HaL HaR OiiiG OiiiB nebula master. This is a very interesting subject. The central star in this image is WR 40 which is located toward the constellation of Carina. WR stands for Wolf Rayet, in honor of French astronomers Charles Wolf and Georges Rayet. This Wolf Rayet star is thus about 100 times as massive as our, lives fast and dies young. It is going quickly to exhaust its core hydrogen supply, moves on to fusing heavier core elements, and expands while ejecting it outer layers via high stellar winds at a speed of nearly 100 kilometers per second, and these outer layers have become the expanding oval-shaped nebula RCW 58. Cfr. https://science.nasa.gov/stellar-wind-shaped-nebula-rcw-58
Telescope CH-1-CMOS Planewave CDK24
Camera QHY 600M
Location: El Sauce Observatory, Chile
Date of observation 27/04/2023
Filters L R G B H O
Processing in PixInSight, Photoshop CreditsCredits: Telescoplive
In this workflow I used Ha narrowband as integration for Luminance and Red channel, and Oiii narrowband master as integration for Green and Blue channel as according to Kayron Mercieca, cfr.: https://www.lightvortexastronomy.com/tutorial-combining-lrgb-with-narrowband.html Approved subframes detailed list (PixInSight weighted) resumed gathered by filter, all by Astronomic, recorded between 28/10/2021 and 25/04/2023. Ha: 226 x 180″ -20C: 141 gain 139, 85 gain 173 Oiii: 159 x 180″ -20C: 94 gain 139, 65 gain 173 L: 636 x 60″ -20C: 553 gain 139, 83 gain 173 G: 532 x 60″ -20C: 373 gain 139, 159 gain 173 B: 500 x 60″ -20C: 298 gain 139, 202 gain 173 R: 614 x 60″ -20C: 438 gain 139, 176 gain 173
Telescopi o obiettivi di acquisizione: William Optics RedCat 51 Petzval APO Camere di acquisizione: ZWO ASI 1600MM-Cool Pro Montature: Skywatcher EQ35M Telescopi o obiettivi di guida: QHYCCD QHY Mini Guide Scope Camere di guida: ZWO ASI 120MM Mini Software: ZWO ASIair Pro · Pleiades Astrophoto PinInsight · Gimp Filtri: Astronomik H alpha 12 nm 2 inch Astronomik · Astronomic SII 6nm 1.25 · astronomic Oiii 6nm Accessorio: ZWO 8x 1.25″ Filter Wheel (EFW) Date:11 Agosto 2021 , 12 Agosto 2021 , 14 Agosto 2021 , 15 Agosto 2021 , 17 Agosto 2021 , 18 Agosto 2021 , 19 Agosto 2021 , 29 Agosto 2021 , 30 Agosto 2021 , 31 Agosto 2021 , 01 Settembre 2021 , 05 Settembre 2021 , 06 Settembre 2021 , 07 Settembre 2021 , 08 Settembre 2021 , 09 Settembre 2021 , 10 Settembre 2021 , 11 Settembre 2021 , 12 Settembre 2021 , 13 Settembre 2021 Pose: Astronomic SII 6nm 1.25: 137×180″ (6h 51′) (gain: 200.00) -20C bin 1×1 Astronomik H alpha 12 nm 2 inch Astronomik: 112×180″ (5h 36′) (gain: 200.00) -20C bin 1×1 Astronomik H alpha 12 nm 2 inch Astronomik: 16×300″ (1h 20′) (gain: 200.00) -20C bin 1×1 astronomic Oiii 6nm: 159×180″ (7h 57′) (gain: 200.00) -20C bin 1×1 Integrazione: 21h 44′ Dark: 33 Flat: 33 Dark dei flat: 33 Giorno lunare medio: 11.30 giorni Fase lunare media: 33.02% Scala del Cielo Scuro Bortle: 6.00 Centro AR: 4h 0′ 40″ Centro DEC: +36° 25′ 27″ Campionamento: 3,148 arcsec/pixel Orientazione: 59,489 gradi Raggio del campo: 2,345 gradi
I still cannot get rid of comet registration alignment by PixInSight, thus just played a hand allineation or R(zr) G(zg) and B(zi) channels in photohop of comet starless image, and then adding stars as new layer in “screen” blending mode. After some research about Palomar 48 inches Samuel Oschin Schmidt telescope and ZTF camera I found here : https://www.ztf.caltech.edu/ztf-camera.html
Apart of aesthetic results, what is important is that if pixinsight works in annotation after platesolving, I hypothesize it could works also in comet registration after a proper platesolving of single channels masterframe; I’m going to try asap.
PixInSight had some problem in platesolving because of peculiar fits header, thus also was impossible to perform image registration > comet registration. I thus worked just by star registration of the few subframes and then play an image integration for each filter: I assigned R channel to zr filter, G to zg and B to zi even I suspect other choose may be taken. After that I made starless and star version for each channel and integrate in pixinsight the starry master, and in photoshop the starless master handly stacking rgb comet.
I finally played some photoshop tricks for pixel fixing, framing, dust lanes enhancing, etc… I would like a more wider field of view for a next attempt, but I confess to me is simply exciting and so so funny to make post-production over these enormous scientific quality data from such powerful instruments! As when I play with JWST or Hubble data (cfr. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html ) I’m simply totally stoked! Thanks again to Taras!!!