Hemisphere:  Northern  ·  Contains:  M 5  ·  NGC 5904  ·  The star 5Ser
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Messier 05 Globular Cluster, 


            Rodney Watters

Messier 05 Globular Cluster

Technical card

Imaging telescopes or lenses: Tak TSA120

Imaging cameras: QSI 683 ws-8

Mounts: EQ8

Guiding telescopes or lenses: Tak TSA120

Guiding cameras: Starlight Xpress Lodestar x2

Focal reducers: Takahashi TOA Reducer .75x

Software: Pixinsight 1.8  ·  Sequence Generator Pro

Filters: Astronomik Red  ·  Astronomik Blue  ·  Astronomik Green

Dates:July 1, 2020July 8, 2020Aug. 19, 2020

Astronomik Blue: 280x60" -20C bin 1x1
Astronomik Green: 290x60" -20C bin 1x1
Astronomik Red: 270x60" -20C bin 1x1

Integration: 14.0 hours

Darks: ~50

Flats: ~50

Bias: ~100

Avg. Moon age: 9.77 days

Avg. Moon phase: 57.25%

Bortle Dark-Sky Scale: 3.00

Basic astrometry details

Astrometry.net job: 4012670

RA center: 15h 18' 42"

DEC center: +1° 57' 54"

Pixel scale: 0.823 arcsec/pixel

Orientation: 87.155 degrees

Field radius: 0.627 degrees

Resolution: 4372x3313

Data source: Backyard


Messier 05 is a Globular Cluster located in the constellation of Serpens Caput (the Snake Head), and makes for fine viewing with the mix of orange and blue stars and pairs well with the bright star 5 Serpentis. The cluster is comprised of over 100,000 stars and is located approximately 25,000 light years away from Earth. Whilst we can see 5 Serpentis in the same field of view as the cluster, the star is only 83 light years away so is much closer to Earth.

The bright star that can be seen in the field of view, 5 Serpentis, is a binary star. The primary component (5 Ser A) has a visual magnitude of 5.1 whilst its companion (5 Ser B) has a magnitude of 10.1 and is separated by 11.4 arc seconds. Whilst it might be tempting to conclude that the small orange star adjacent to 5 Serpentis in the image is its binary companion, this is not the case. I used the Stellarium planetarium program to measure the angular separation between these two stars in the image and the separation is 34 arc seconds. The actual binary companion is buried in the glow from the primary star.



Rodney Watters
License: None (All rights reserved)

Sky plot

Sky plot


Messier 05 Globular Cluster, 


            Rodney Watters

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