M51 – NGC5194


This week , with a moderated seeing, I shooted 4 x 400 sec. in luminance bin 2×2 and 3 x 300 sec. RGB each channel. Needs more time and refine the scope’s collimation, but, unfortunately, the weather conditions and the seeing  became “horrendous”…

In this case, all the workflow was made with PixInsight 1.52 (excellent software!!): Align, average image registration with sigma pixel rejection,  a little deconvolution on L channel, dynamic background extraction, L+RGB combination, histogram transform and curbes-saturation. Resized to web with Gimp . All under Ubuntu x64.

From Wikipedia:

The Whirlpool Galaxy (also known as Messier 51a, M51a, or NGC 5194) is an interacting[4] grand-design[5] spiral galaxy located at a distance of approximately 31 million light-years in the constellation Canes Venatici. It is one of the most famous spiral galaxies in the sky.[citation needed] The galaxy and its companion (NGC 5195) are easily observed by amateur astronomers, and the two galaxies may even be seen with binoculars.[6] The Whirlpool Galaxy is also a popular target for professional astronomers, who study it to further understanding of galaxy structure (particularly structure associated with the spiral arms) and galaxy interactions.

Observation data (J2000 epoch)
Constellation Canes Venatici[1]
Right ascension 13h 29m 52.7s[2]
Declination +47° 11′ 43″[2]
Redshift 463 ± 3 km/s[2]
Distance 23 ± 4 Mly (7.1 ± 1.2 Mpc)[3]
Type SA(s)bc pec[2]
Apparent dimensions (V) 11′.2 × 6′.9[2]
Apparent magnitude (V) 9.0[2]
Notable features Interacting with NGC 5195[4]
Other designations
Question Mark Galaxy,[2] Rosse’s Galaxy,[2] M51a,[2] NGC 5194,[2] UGC 8493,[2] PGC 47404,[2] VV 001a,[2] VV 403,[2] Arp 85[2]

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