Full record: 1539
Description: M74, a spiral galaxy similar to our own, seen face-on, at a distance of 30 million light years, imaged with the QHY camera at the WHT PF. R filter focus 0.55 FWHM=0.5 5 imgsx60s runs; G filter focus ~0.55 FWHM=0.6-0.7 5 imgsx60s runs; B filter focus ~0.55 FWHM=0.7 5 imgsx60s Halpha focus 0.72 (difficult!) FWHM=1.5 15 imgsx60. All runs taken with dithers. Composite RGB image (Deepskystacker + gimp + rawtherapee) and with a touch of wavelets (Registax). N left, E up.
Telescope: WHT
Instrument: PF-QHY
Credit: Ovidiu Vaduvescu, Jure Skvarc and Norberto Gonzalez (ING)
Date: 21 March 2021

JPG (1.9M) 4480×2886 pixels
PNG (898K) 1098×727 pixels

Full record: 1965
Description: Moon mosaic made of 22 points with RGB filters, binning 1 (66 images total). Total image size 32541x18300 pixels (595.5 megapixel image). Processed with Photoshop.
Telescope: WHT
Instrument: PF-QHY
Credit: Eduardo Mantero
Date: 20 March 2021

JPG (322.3M) 32541×18304 pixels

Full record: 1969
Description: Image from the night 2021-03-14: 2x 200s (R), 1x150s (G) and 1x150s (B). DeepSkyStacker+FitsLiberator+Photoshop.
Telescope: WHT
Instrument: PF-QHY
Credit: Javier Mendez, Marc Balcells, Chris Benn.
Date: 14 March 2021

PNG (2.9M) 1900×1438 pixels

Full record: 1966
Description: 5s-exposures in seeing ~0.9, binning 2. DeepSkyStacker (stacking and calibration) + Astrometry.net (wcs coordinates) + Astropy + sep (Background subtraction, bw=300) + APLpy (RGB combination, stretch=sqrt, pmin=15, pmax_r=99.78, pmax_g=99.75, pmax_b=99.75).
Telescope: WHT
Instrument: PF-QHY
Credit: Florencia Jimenez.
Date: 18 February 2021

PNG (6.1M) 1756×1768 pixels

Full record: 1970
Description: Deepskystacker for stacking and calibration, convert from ImageMagick collection for RGB composition, Registax for sharpening and colour plane adjustment, rawtherapee for level adjustment and GIMP for removal of a flat artifact.
Telescope: WHT
Instrument: PF-QHY
Credit: Jure Skvarc, Lilian Dominguez, Norberto Gonzalez.
Date: 25 January 2021

JPG (6.3M) 4788×3194 pixels

Full record: 843
Description: This image of an unusually-close conjunction of Jupiter and Saturn was obtained on 21 Dec 2020, during tests of the new optical corrector at the prime focus of the William Herschel Telescope (WHT). The image is a composite of exposures taken with a CMOS camera, through blue, green and red filters.

More: http://www.ing.iac.es/PR/press/conjuncti...
Telescope: WHT
Instrument: PF-QHY
Credit: Javier Mendez, Richard Ashley, Lilian Dominguez, Emilie Lhome, Jure Skvarc and Ovidiu Vaduvescu (Isaac Newton Group of Telescopes, La Palma, Spain).
Date: 23 December 2020

Full record: 1971
Description: An attempt to resolve the cross in the galaxy centre using R-band images from 2020-11-20 (5x100s in seeing ~0.8arc, binning 2) using DeepSkyStacker (drizzle 3)+DS9 (log scale, linear for the cross)+Photoshop (sharpenning).
Telescope: WHT
Instrument: PF-QHY
Credit: Javier Mendez (ING)
Date: 20 November 2020

PNG (286K) 751×585 pixels

Full record: 1963
Description: Only 30 images in RGB. Esposure times 2, 3, 5 ms for R, G, B, respectively. Binning 1. Processing with Autostakkert (50 % best selection, alignment 3x drizzle, stacking), Registax (wavelet sharpening), convert (colour composition), gimp (blue level reduction). Seeing at the time probably about 0.7 arc-seconds.
Telescope: WHT
Instrument: PF-QHY
Credit: Jure Skvarc and Norberto Gonzalez.
Date: 7 November 2020

PNG (4.5M) 1188×1200 pixels

Full record: 1964
Description: The original image is ~ 4800 x 3200 pix. Exposure time 1 msec.
Telescope: WHT
Instrument: PF-QHY
Credit: Chris Benn and Lara Monteagudo.
Date: 6 November 2020

GIF (316K) 795×527 pixels

Full record: 1967
Description: M74, a spiral galaxy similar to our own, seen face-on, at a distance of 30 million light years. Images obtained on 2020-11-06,07 using the filters RGBHa: R (5x60s y 1x100s), G (4x5s, 5x60s, 1x100s), B(5x5s, 1x10s, 5x60s, 1x100s) and Halpha (10x10s, 15x60s y 2x100s). DeepSkyStacker and Photoshop for layer combination (RGB + luminance Halpha+R) and adjustment of levels, curves, color balance... Cosmetic refinement using LightRoom.
Telescope: WHT
Instrument: PF-QHY
Credit: Dario Gonzalez Picos (ING)
Date: 6 November 2020

JPG (18.9M) 5571×3589 pixels

Full record: 1968
Description: Image made with: 5 Exp 120s for each filter RGB. Flat correction and guiding. Deepskystaker for stacking the images, Phoshop for the color balance and cosmetics improvements.(Imperfection on the image, if you looks close you can see something like hot pixels).
Telescope: WHT
Instrument: PF-QHY
Credit: Richard Ashley, Eduardo Mantero (ING).
Date: 13 February 2020

JPG (8.5M) 4622×3068 pixels

Full record: 1972
Description: Image made with: 3 Exp 60s for each filter RGB. No Flats, No bias and no dark correction and no guiding made. Deepskystaker for stacking the images, Phoshop for the color balance and cosmetics improvements.
Telescope: WHT
Instrument: PF-QHY
Credit: Richard Ashley, Eduardo Mantero (ING)
Date: 12 February 2020

PNG (7.7M) 4496×2724 pixels