Astrophotography from Los Llanos de Aridane – Pinwheel Galaxy M101

End of February 2014 I already recorded M101 from Boeblingen near Stuttgart. The total exposure time was about 6 hours (!). This time I did a 2h40m exposure from Los Llanos de Aridane on La Plama with exactly the same equipment. This is the result. From my perspective the two pictures do not have a big difference despite the colour tone which of course depends on the post processing.

LocationLa Palma / Spain
ObjectPinwheel Galaxy M101
Guidingyes, QHY5-II Mono via OAG
Telescope8" GSO Newtonian
Barlow lensnone
Luminance10x 600s, bin: 1x1
Red8x 150s, bin: 2x2
Green8x 150s, bin: 2x2
Blue8x 150s, bin: 2x2
Total exposure~2h40m

However, it’s interesting to compare the results with respect to their total exposure time: The image recorded from Boeblingen was exposed more than two times longer.

As a result of the long exposure time the stars are not as perfectly round as the ones with a shorter exposure time. Despite that I am happy to see what is still possible from a city like Boeblingen 🙂 Finally I combined both images to one final image by rotating one image until it matched exactly. Maybe I am wrong but I think in the end this combined image has a little more detail than each of the pictures alone. A full resolution image is available here.

Last updated: June 16, 2022 at 12:17 pm

Having a look at the Pinwheel Galaxy (M101)

The Pinwheel Galaxy M101 (NGC 5457) is a spiral galaxy in constellation Ursa Major. It is about 21 million ly away from earth. The apparent magnitude of this galaxy is ~7.8 mag. Therefore, this object is well suited for astrophotography with equipment like mine.

There is also a full resolution image of M101 available. UPDATE: I finally decided to put this picture into My Top Astro-Pics gallery.

LocationBöblingen / Germany
ObjectPinwheel Galaxy (M101)
Guidingyes, DMK31AU03.AS via OAG
Telescope8" GSO Newtonian
Barlow lensnone
Luminance12x 800s, bin: 1x1
Red9x 450s, bin: 2x2
Green9x 450s, bin: 2x2
Blue9x 450s, bin: 2x2
Total exposure~6h02min

Clear skies!

Last updated: June 20, 2022 at 9:58 am