An ~ 3.8h OSC image combining the use of F5.0 f =1000 mm and F4.0 f- = 1200 mm telescopes.  The red channel was supplemented with some of a 50 min HA image in order to highlight HA regions within the galaxy. 

The original image luminance was combined just at the centre - using  a high dynamic range composition - with a slightly sharper ~ 600 x ~ 5s mono camera image into an overall  high dynamic range composition that was also deconvolved in PixInsight.  This HDRC luminance was added back into the OSC RGB image

Revision B omits any use of the short frame luminance mono camera image at all.  Here the luminance of the combined OSC/HA image was sharpened with BlurXt (70%) and de-noised using NoiseXt  to produce an overall sharper and less noisy image in a simpler way.

M63, also known as NGC 5055  (or the sunflower ga;axy) is a spiral galaxy in Canes Venatici with approximately 400 billion stars.   The distance to M63, based upon the luminosity-distance measurement is 29.3M ly and it is part of the M51 Group, a local group of galaxies that also includes M51 (the 'Whirlpool Galaxy'.  M63 has a SAbc form] indicating a spiral with no central bar feature (SA) and moderate to loosely wound arms (bc).  In visible light  no continuous spiral arm structure is obvious and so it is considered a flocculent galaxy.  However in the near infrared, a symmetric, two-arm structure is apparent.  Radio observations at the 21-cm hydrogen line show the gaseous disk of M63 extends outward to a radius of 130,000 light-years (40 kiloparsecs), well past the bright optical disk. The shape pf the gaseous exterior  suggests a dark matter halo that is offset with respect to the inner region.  M63 is weakly active with a LINER nucleus –   'low-ionization nuclear emission-line region'.  Soft X-rays and hydrogen (H-alpha) emission can be observed coming from along a particular direction withyin in the nucleus. It is uncertain whether a supermassive black hole is present at the core.   In 1971, a supernova  appeared in one of the arms.