Hemisphere:  Southern  ·  Constellation: Scorpius (Sco)  ·  Contains:  M 7  ·  NGC 6475  ·  Ptolemy's Cluster
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M7 - Ptolemy's Legacy, 


            Andy 01
M7 - Ptolemy's Legacy
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M7 - Ptolemy's Legacy

Technical card

Imaging telescopes or lenses: Takahashi TOA-130 APO Refractor

Imaging cameras: QSI 6162 monochrome

Mounts: Takahashi NJP Temma-2

Guiding cameras: Starlight Xpress Lodestar Off Axis Guider

Software: Adobe Photoshop 2020  ·  Sky Safari Pro  ·  PHD2 Guiding 2.6.6 PHD2  ·  Topaz Denoise DeNoise  ·  Noel Carboni's Astro Tools for PhotoShop Noel Carboni Actions  ·  Nik Software, Inc. Nik Filters

Filters: Chroma Blue  ·  Chroma Green  ·  Chroma Red  ·  Chroma Luminance

Accessory: Kendrick Standard Dual Channel Controller

Dates:June 28, 2020

Chroma Blue: 20x180"
Chroma Green: 20x180"
Chroma Luminance: 24x300"
Chroma Red: 21x180"

Integration: 5.0 hours

Avg. Moon age: 7.55 days

Avg. Moon phase: 51.80%

Basic astrometry details

Astrometry.net job: 3646449

RA center: 17h 53' 35"

DEC center: -34° 43' 40"

Pixel scale: 1.245 arcsec/pixel

Orientation: 191.364 degrees

Field radius: 0.858 degrees

Resolution: 2998x3952

Locations: Burwood, Melbourne, Victoria, Australia

Data source: Backyard


M7 has been known since antiquity; it was first recorded by the 2nd-century Greek-Roman astronomer Ptolemy, who described it as a nebula in 130 AD.
(Well nevermind, he also thought the Earth was the centre of the universe, which revolved around it!)
Italian astronomer Giovanni Batista Hodierna observed it before 1654 and counted 30 stars in it.
In 1764, French astronomer Charles Messier catalogued the cluster as the seventh member in his list of comet-like objects.
English astronomer John Herschel described it as "coarsely scattered clusters of stars".

Anyway, it's pretty darned amazing looking up into the core of the Milky way and gazing in wonder at the sea of stars behind M7.
Whoever said that "there are more stars in the sky then grains of sand on all the beaches on all the earth" needs only to show a disbeliever this photo!

Bowie fans will recognise the Starman himself, from the 'Serious Moonlight' tour graphic - dancing above the cluster!

Taken from light pollutionville, Melbourne, Australia.


Sky plot

Sky plot


M7 - Ptolemy's Legacy, 


            Andy 01