Messier 71, also known as M71, NGC 6838, or the Angelfish Cluster, is a globular cluster in the small northern constellation Sagitta. It was discovered by Philippe Loys de Chéseaux in 1745 and included by Charles Messier in his catalog of non-comet-like objects in 1780. It was also noted by Koehler at Dresden around 1775.[8] Messier 71 is also known as NGC 6839, though this identification is very uncertain. This star cluster is about 13,000 light years away from Earth and spans 27 light-years (8 pc). The irregular variable star Z Sagittae is a member.
Object Designations: Messier 71 or M71, NGC6838
Also known as: Angelfish Cluster
Constellation: Sagitta
Object Type: star cluster
Distance: 13,000 light-years away
Magnitude: 8.2
Discovery: Philippe Loys de Chéseaux
Telescope: Apertura CarbonStar 200 Imaging Newtonian 800mm / F4
Camera: ZWO ASI2600 MC Pro – Oplong L-QEF
Mount: Celestron AVX – With CPWI Software
Guiding: Apertura 32mm Guide Scope with a ZWO ASI120MM Camera and PHD2
SharpCap Imaging Software
Processing Software
AstroSharp Ltd SharpCap
Pleiades Astrophoto PixInsight
GraXpert
Russell Croman Astrophotography BlurXTerminator
Russell Croman Astrophotography NoiseXTerminator
Russell Croman Astrophotography StarXTerminator
Various scripts
This final image is:
20 – 60 second subs at 100 gain, Oplong L-QEF
White Bal (B) = 45
White Bal (R )= 78
Brightness = 12
Camera Temperature = -4
LastPlateSolveData=Plate solve result was RA=19:45:39.9,Dec=+18:37:51 with mount at RA=19:45:40.1,Dec=+18:37:51, FOV 1.760×1.176 degrees, up is 269.81 degrees East of North
