Designation: M15, NGC 7078 Constellation: Pegasus
Visual magnitude: +6.2 Apparent size: 18′
Diameter: 178 light years. Distance: 34,000 light years.
Robert Burnham Jr described M15 as “one of the richer and more compact globulars” – and it is certainly an impressive sight, despite its distance of 34,000 light years from us.
Orbiting outside the Milky Way galaxy, it contains over 100,000 stars and I also read that it is one of the densest globular clusters, with half the mass located inside a radius of about ten light years.
That seems to imply that there may be 50,000 stars inside that relatively that ten light year radius!
What an amazing “night” sky there would be for anyone living on a planet orbiting one of the stars inside that radius. Spending a night under the stars would have a whole new meaning!
However, because a black hole is believed to exist at its centre, the x-ray environment would not be conducive to life as we know it.
Also in image: See overlay of my image at Astrometry.net
Blog ends here. Here comes a load of technical details:
Exposure: 9 x 143 sec = 21.45 min.
Image acquisition: SharpCap.
|Telescope:||SkyWatcher Esprit||Type:||120ED triplet refractor|
|Focal:||840 mm F/7||Mount:||SkyWatcher EQ6-R Pro|
|Camera:||ZWO ASI 071 MC Pro
||Type:||CMOS 28.4mm 16 Mpx
|Optical aids:||Flattener: Y; filter: LP||Guiding:||Yes|
|Polar aligning:||QHYCCD PoleMaster||Polar Error:||3’45”|
[ZWO ASI071MC Pro]
Auto Exp Target Brightness=100
Image © Roger Powell