Night Pinwheel Galaxy (M101) from my light-polluted backyard

Pinwheel Galaxy (M101) from my light-polluted backyard · **8 Likes**

Hi,

M101 is a large and beautiful galaxy in Ursa Major. It was not so easy to bring out the faint outer arms from light pollution

Details:

GSO 200/800 Newtonian scope with GPU coma corrector on Vixen GPD2 mount
ZWO ASi 1600MM cooled monochrome camera with ZWO filter wheel, LRGB filters, off-axis guider and ASI 120MM mini guiding camera, everything run by ASIAIR
Luminance : 60*120 sec at gain 76
Chrominance : 10*120sec at gain 76 for each channel
60 darks, 20 flats for each filter (2 sec), 20 darks of flats
Preprocessing and stacking with Siril, processing with PixInsight, final touching up with Rawtherapee

**Kerrowdown** · 05-22-2020, 04:02 AM

Originally posted by Dan Paris

GSO 200/800 Newtonian scope with GPU coma corrector on Vixen GPD2 mount ZWO ASi 600MM cooled monochrome camera with ZWO filter wheel, LRGB filters, off-axis guider and ASI 120MM mini guiding camera, everything run by ASIAIR Luminance : 60*120 sec at gain 76 Chrominance : 10*120sec at gain 76 for each channel 60 darks, 20 flats for each filter (2 sec), 20 darks of flats Preprocessing and stacking with Siril, processing with PixInsight, final touching up with Rawtherapee

Some great imagery from yourself...

But with these kind of technical details... for which I'd need to use Google Translate to try and even attempt to understand.

I'll stick to the old plain photography stuff.

**PJ1** · 05-22-2020, 03:25 PM

Another very nice pic. I can only admire your skill and hard work.

**Tonytee** · 05-22-2020, 05:20 PM

I must say, "Most Impressive." I am grateful for all of the details as it helps to appreciate the hard work and obvious talents and gifts that are needed to accomplish such a feat. Many thanks for

sharing.

TT

**hjortron** · 05-23-2020, 04:33 AM

Wow! Excellent shot!

RobG · 05-23-2020, 04:43 AM

Fabulous image! Wish I could get close to it with the K3 and GPS.

**Apet-Sure** · 05-23-2020, 01:32 PM

Originally posted by Kerrowdown

But with these kind of technical details... for which I'd need to use Google Translate to try and even attempt to understand.

My eyes glaze over when reading the technical details, but not before they have enjoyed this wonderful image!

Dan Paris · 05-27-2020, 04:38 AM

Thanks Kerrowdown, PJ1, Tony, hjortron, Rob and Apet-Sure for your kind words.

(yes I do agree that the technical details are not very inviting...)

lesmore49 · 05-28-2020, 06:43 AM

Very impressive. I've never seen anything like that before. I do marvel at the universe we live in.

aitrus3 · 05-30-2020, 09:06 AM

Originally posted by Dan Paris

Hi,

M101 is a large and beautiful galaxy in Ursa Major. It was not so easy to bring out the faint outer arms from light pollution

Details:

GSO 200/800 Newtonian scope with GPU coma corrector on Vixen GPD2 mount
ZWO ASi 1600MM cooled monochrome camera with ZWO filter wheel, LRGB filters, off-axis guider and ASI 120MM mini guiding camera, everything run by ASIAIR
Luminance : 60*120 sec at gain 76
Chrominance : 10*120sec at gain 76 for each channel
60 darks, 20 flats for each filter (2 sec), 20 darks of flats
Preprocessing and stacking with Siril, processing with PixInsight, final touching up with Rawtherapee

Lovely. Well done, nice processing!

**dneira29** · 07-20-2021, 09:08 AM

Originally posted by Dan Paris

Hi,

M101 is a large and beautiful galaxy in Ursa Major. It was not so easy to bring out the faint outer arms from light pollution

Details:

GSO 200/800 Newtonian scope with GPU coma corrector on Vixen GPD2 mount
ZWO ASi 1600MM cooled monochrome camera with ZWO filter wheel, LRGB filters, off-axis guider and ASI 120MM mini guiding camera, everything run by ASIAIR
Luminance : 60*120 sec at gain 76
Chrominance : 10*120sec at gain 76 for each channel
60 darks, 20 flats for each filter (2 sec), 20 darks of flats
Preprocessing and stacking with Siril, processing with PixInsight, final touching up with Rawtherapee

NIc host! Love the amount of detail you captured!

**SelrahCharleS** · 07-20-2021, 10:01 AM

Nice capture!

---------- Post added 07-20-2021 at 12:05 PM ----------

Originally posted by Dan Paris

(yes I do agree that the technical details are not very inviting...)

On the other hand, as someone who has just started to dabble a little in astrophotography this gives me some terms to google and an idea or what can be achieved even in a somewhat light polluted area. For me the technical details are much appreciated.

Dan Paris
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05-22-2020, 04:02 AM	#2
Kerrowdown PEG Moderator Join Date: Aug 2008 Location: Highlands of Scotland... "Hold Infinity in the palm of your hand" - William Blake Photos: Gallery Posts: 57,836	Originally posted by Dan Paris GSO 200/800 Newtonian scope with GPU coma corrector on Vixen GPD2 mount ZWO ASi 600MM cooled monochrome camera with ZWO filter wheel, LRGB filters, off-axis guider and ASI 120MM mini guiding camera, everything run by ASIAIR Luminance : 60120 sec at gain 76 Chrominance : 10120sec at gain 76 for each channel 60 darks, 20 flats for each filter (2 sec), 20 darks of flats Preprocessing and stacking with Siril, processing with PixInsight, final touching up with Rawtherapee Some great imagery from yourself... But with these kind of technical details... for which I'd need to use Google Translate to try and even attempt to understand. I'll stick to the old plain photography stuff.

05-22-2020, 03:25 PM	#3
PJ1 Loyal Site Supporter Join Date: Jul 2012 Location: Toowoomba, Australia Photos: Gallery \| Albums Posts: 5,486	Another very nice pic. I can only admire your skill and hard work.

05-22-2020, 05:20 PM	#4
Tonytee Loyal Site Supporter Join Date: Jul 2012 Photos: Gallery \| Albums Posts: 21,505	I must say, "Most Impressive." I am grateful for all of the details as it helps to appreciate the hard work and obvious talents and gifts that are needed to accomplish such a feat. Many thanks for sharing. TT

05-23-2020, 04:33 AM	#5
hjortron Loyal Site Supporter Join Date: Oct 2019 Location: The very centre of Europe Posts: 914	Wow! Excellent shot!

05-23-2020, 04:43 AM	#6
RobG Otis Memorial Pentaxian Join Date: Dec 2009 Location: Canberra Photos: Gallery \| Albums Posts: 8,902	Fabulous image! Wish I could get close to it with the K3 and GPS.

05-23-2020, 01:32 PM	#7
Apet-Sure Site Supporter Join Date: Dec 2015 Location: Goldsboro North Carolina Photos: Gallery \| Albums Posts: 2,861	Originally posted by Kerrowdown But with these kind of technical details... for which I'd need to use Google Translate to try and even attempt to understand. My eyes glaze over when reading the technical details, but not before they have enjoyed this wonderful image!

05-27-2020, 04:38 AM	#8
Dan Paris Veteran Member Join Date: Jul 2018 Posts: 505 Original Poster	Thanks Kerrowdown, PJ1, Tony, hjortron, Rob and Apet-Sure for your kind words. (yes I do agree that the technical details are not very inviting...)

05-28-2020, 06:43 AM	#9
lesmore49 Pentaxian Join Date: Nov 2007 Location: Western Canada Posts: 12,349	Very impressive. I've never seen anything like that before. I do marvel at the universe we live in.

05-30-2020, 09:06 AM	#10
aitrus3 Pentaxian Join Date: Mar 2010 Location: Kamloops B.C. Photos: Gallery \| Albums Posts: 1,432	Originally posted by Dan Paris Hi, M101 is a large and beautiful galaxy in Ursa Major. It was not so easy to bring out the faint outer arms from light pollution Details: GSO 200/800 Newtonian scope with GPU coma corrector on Vixen GPD2 mount ZWO ASi 1600MM cooled monochrome camera with ZWO filter wheel, LRGB filters, off-axis guider and ASI 120MM mini guiding camera, everything run by ASIAIR Luminance : 60120 sec at gain 76 Chrominance : 10120sec at gain 76 for each channel 60 darks, 20 flats for each filter (2 sec), 20 darks of flats Preprocessing and stacking with Siril, processing with PixInsight, final touching up with Rawtherapee Lovely. Well done, nice processing!

07-20-2021, 09:08 AM	#11
dneira29 Site Supporter Join Date: Oct 2020 Posts: 535	Originally posted by Dan Paris Hi, M101 is a large and beautiful galaxy in Ursa Major. It was not so easy to bring out the faint outer arms from light pollution Details: GSO 200/800 Newtonian scope with GPU coma corrector on Vixen GPD2 mount ZWO ASi 1600MM cooled monochrome camera with ZWO filter wheel, LRGB filters, off-axis guider and ASI 120MM mini guiding camera, everything run by ASIAIR Luminance : 60120 sec at gain 76 Chrominance : 10120sec at gain 76 for each channel 60 darks, 20 flats for each filter (2 sec), 20 darks of flats Preprocessing and stacking with Siril, processing with PixInsight, final touching up with Rawtherapee NIc host! Love the amount of detail you captured!

07-20-2021, 10:01 AM	#12
SelrahCharleS Site Supporter Join Date: Dec 2006 Location: Wisconsin, USA Posts: 937	Nice capture! ---------- Post added 07-20-2021 at 12:05 PM ---------- Originally posted by Dan Paris (yes I do agree that the technical details are not very inviting...) On the other hand, as someone who has just started to dabble a little in astrophotography this gives me some terms to google and an idea or what can be achieved even in a somewhat light polluted area. For me the technical details are much appreciated.