25/03/2026
Date night with M101
One moonless night with my 2 8” newtonian setups. I started with the Ha when the galaxy was a bit lower in the sky, then did some R, G and B, I shot the Luminance when the galaxy was at its highets and then finished it off with some more R, G and B.
Pretty pleased with the result.
I hope you like it too!
The Pinwheel Galaxy (also known as Messier 101, M101 or NGC 5457) is a face-on spiral galaxy 21 million light-years away from Earth in the constellation Ursa Major. It was discovered by Pierre Méchain in 1781 and was communicated that year to Charles Messier, who verified its position for inclusion in the Messier Catalogue as one of its final entries.
Messier 101 a bit of a monster; physically spanning around 170,000 light years (it lies some 20.9 million light years away) and believed to host a trillion stars, Messier 101 is the second-largest galaxy in Messier’s catalogue after the mighty Andromeda Galaxy (Messier 31). Thus, unsurprisingly, it is the third largest by appearance on the sky after Andromeda and M33, the Triangulum Galaxy, spanning a whopping 27’ x 26’. Physically, M101 matches up well with M31 and somewhat dwarfs M33.
The galaxy's spiral arms are sprinkled with large regions of star-forming nebulas. These nebulas are areas of intense star formation within giant molecular hydrogen clouds. Brilliant, young clusters of hot, blue, newborn stars trace out the spiral arms.
Equipment used:
Mounts: StellarDrive GT6, Dark Frame hypertuned EQ6
Modified Sky-Watcher Explorer 200p (Baader Diamond Steeltrack focuser), Orion Optics CT8
2 x Aplanatic coma corrector
ASI294MM Pro Cmos camera, cooled at - 15°C
QHY268M Pro Cmos camera, cooled at - 10°C
8x1.25" ZWO USB filterwheel
QHYCCD QHYCCD CFW3M-US 36mm filterwheel
Chroma 1.25" 3nm Ha and LRGB filters
Antlia 36mm 3nm Ha and lRGB filters
2 x ZWO ASI290m Mini guide cameras
ZWO OAG
QHYCCD OAG-M
Qhyccd Polemaster
Software used:
Eqmod, SGP - Sequence Generator Pro, PHD2, Stellarium, SharpCap for polar alignment
Date 21.03.2026
Location:
Hemel Hempstead, Hertfordshire, bortle 5
Frames:
Antlia 3nm Narrowband H-alpha 36 mm: 9×600″(1h 30′)
Antlia V-Pro Blue 36 mm: 9×300″(45′)
Antlia V-Pro Green 36 mm: 12×300″(1h)
Antlia V-Pro Luminance 36 mm: 24×300″(2h)
Antlia V-Pro Red 36 mm: 12×300″(1h)
Chroma Blue 1.25": 17×180″(51′)
Chroma Green 1.25": 20×180″(1h)
Chroma H-alpha 3nm Bandpass 1.25": 18×300″(1h 30′)
Chroma Lum 1.25": 40×180″(2h)
Chroma Red 1.25": 20×180″(1h)
Total integration time: 12h 36′
Stacked and calibrated in AstroPixel Processor and processed in Pixinsight (with help from Blur Xterminator, Star Xterminator and Noise Xterminator) and Photoshop CC 2026
Full resolution: https://www.astrobin.com/tfo0h8/
Instagram: https://www.instagram.com/ancient_light_by_emilandronic/
More of my work on my website:
https://emilandronic.co.uk/