Image of the day 01/06/2017

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Technical card

Resolution: 4033x4042

Astrometry.net job: 1038651

RA center: 268.421 degrees

DEC center: -34.800 degrees

Pixel scale: 1.610 arcsec/pixel

Orientation: -92.264 degrees

Field radius: 1.276 degrees

Description

M7

http://www.astrobin.com/245119/

L: 11x300s
RGB: (5, 5, 5)x300s

Image aquisition : Eric Recurt
Processing : Roberto Colombari
Astrograph: 350mm F3.3
CCD: FLI PL 16803-65 / FLI Atlas focuser
Mount: ASA

From Teide Observatory , Cosmos Tenerife , IAC/ TADer dome .
Tenerife
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Messier 7 or M7, also designated NGC 6475 and sometimes known as the Ptolemy Cluster,[4] is an open cluster of stars in the constellation of Scorpius. The cluster is easily detectable with the naked eye, close to the "stinger" of Scorpius (also called Scorpio[5]). With a declination of -34.8°, it is the southernmost Messier object.
M7 has been known since antiquity; it was first recorded by the 1st-century Greek-Roman astronomer Ptolemy, who described it as a nebula in 130 AD.[6] 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".[4]

Source: Wikipedia

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Roberto Colombari
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M7, Roberto Colombari

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