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Contains:  M 7, NGC 6475
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Ptolemy Cluster - m7, 



    
        

            Jeff
Ptolemy Cluster - m7
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Ptolemy Cluster - m7

Technical card


Dates:Sept. 30, 2018

Frames: 23x60"

Integration: 0.4 hours

Avg. Moon age: 20.13 days

Avg. Moon phase: 70.83%


Basic astrometry details

Astrometry.net job: 2284877

RA center: 17h 53' 46"

DEC center: -34° 47' 31"

Pixel scale: 1.150 arcsec/pixel

Orientation: 289.010 degrees

Field radius: 0.479 degrees


Resolution: 2400x1800

Data source: Backyard

Description

I have always enjoyed the Ptolemy Cluster visually due to its bright blue stars seeming to stand out from the background Milky Way.

It includes four Bp/Ap stars which are not well understood. These rotate slowly, have extremely strong magnetic fields, and contain high concentrations of heavy metals such as Chromium, Manganese and Mercury.

Why these stars are so magnetic remains a mystery!

Comments

Author

jcoldrey
Jeff
License: Attribution Creative Commons
1370
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Ptolemy Cluster - m7, 



    
        

            Jeff