Comet 41P/Tuttle-Giacobini-Kresak
Redo from March 2017 - my last attempt producing a colourless "star-mask" type background. This time, Ive kept the colour in and objects that got filtered out such as the galaxies at top right stayed in.
Set-up was a Altair Astro 480/80mm f/6 refractor with a Canon 60Da DSLR and an IDAS LPS D1 filter.
Guiding was with a SSAG/PHD combination on an Ioptron ZEQ25GT mount. The comet was in Ursa Major.
35 x 3 minute subs at ISO 800 were taken.
30 bias frames
30 dark frames
42 flat frames (LCD panel at 1/20s)
Image field of view: 41.7 x 30.6 arcmins
Image centred on: RA: 11h 49m 44.982s, DEC: +59deg 46m 03.06s
Image scale: 1.82 arcsec/pixel.
Galaxies in top left:
NGC 3894 Elliptical galaxy, 2.8 x 1.7 arcmins
NGC 3895 Barred spiral galaxy, 1.1 arcmins x 48 arcsecs
I still have some serious star-bloating going on but I think thats an issue with my Canon 60Da/LPS filter.
Comet 41P/Tuttle-Giacobini-Kresak
Redo from March 2017 - my last attempt producing a colourless "star-mask" type background. This time, Ive kept the colour in and objects that got filtered out such as the galaxies at top right stayed in.
Set-up was a Altair Astro 480/80mm f/6 refractor with a Canon 60Da DSLR and an IDAS LPS D1 filter.
Guiding was with a SSAG/PHD combination on an Ioptron ZEQ25GT mount. The comet was in Ursa Major.
35 x 3 minute subs at ISO 800 were taken.
30 bias frames
30 dark frames
42 flat frames (LCD panel at 1/20s)
Image field of view: 41.7 x 30.6 arcmins
Image centred on: RA: 11h 49m 44.982s, DEC: +59deg 46m 03.06s
Image scale: 1.82 arcsec/pixel.
Galaxies in top left:
NGC 3894 Elliptical galaxy, 2.8 x 1.7 arcmins
NGC 3895 Barred spiral galaxy, 1.1 arcmins x 48 arcsecs
I still have some serious star-bloating going on but I think thats an issue with my Canon 60Da/LPS filter.