This image is the first time I used Drizzle when processing in SIRIL, I think it did help.  I also inserted a more cropped image.

Messier 5 (M5) is a bright globular cluster located in the northern constellation Serpens. It lies at a distance of 24,500 light years from Earth, in the galactic halo of the Milky Way. It has the designation NGC 5904 in the New General Catalogue.With an apparent magnitude of 6.65, Messier 5 can be seen without binoculars, but only under extremely dark skies and it only appears as a faint star near the star 5 Serpentis. Binoculars will reveal the object to not be a star, but a fuzzy patch of light, and small telescopes will show a bright glowing core.

Individual stars will only appear in larger telescopes, starting with 4-inch instruments, which reveal the cluster’s brightest stars. The best time to observe M5 is in the months of March, April and May.The cluster can be found about a fist-width to the north of Zubeneschamali, the brightest star in the constellation Libra. It can also be found about two fist-widths to the southeast of Arcturus, the brightest star in Boötes constellation and fourth brightest star in the sky, or three fist-widths east of Spica, the brightest star in Virgo and the 15th brightest of all stars. Arcturus and Spica can easily be located by following the line formed by the three bright stars that mark the handle of the Big Dipper. The imaginary line leads first to Arcturus and then to Spica.
 The cluster contains at least 105 variable stars, of which 97 are of the RR Lyrae type and can be used to measure distances in outer space. The first variables in M5 were discovered by the English amateur astronomer Andrew Ainslie Common in 1890. American astronomer Solon Irving Bailey later found 85 RR Lyrae variables in the cluster.M5 also has a significant number of blue stragglers, old stars that appear younger and bluer than they should be, likely as a result of interaction with other stars.Messier 5 is home to more than 100,000 stars, as many as 500,000 according to some sources. The cluster’s overall spectral type is F7. The brightest stars in M5 are of magnitude 12.2.Astronomers have also observed a dwarf nova in M5, a type of cataclysmic variable star that consists of a close binary system in which one of the stars is a white dwarf that accretes matter from its binary companion. As a result, the white dwarf exhibits periodic outbursts.The estimated age of M5 is 13 billion years, making it one of the older known globular clusters associated with our galaxy.In 1997, two millisecond pulsars were discovered in the cluster.

 FACTS
Object: Cluster Type: Globular Class: V Designations: Messier 5, M5, NGC 5904, GCl 34, C 1516+022Constellation: SerpensRight ascension: 15h 18m 33.22s Declination: +02°04’51.7” Distance: 24,500 light years (7,500 parsecs) Age: 13 billion years Number of stars: >100,000 Apparent magnitude: +6.65 Apparent dimensions: 23′ Radius: 80 light years Tidal radius: 200 light years

All information from Messier-Objects.com



Messier 5 not really satisfied