Description

Messier 15 (NGC 7078) is a globular cluster containing more than 100.000 stars as well as possibly a central black hole, it is located in the constellation Pegasus. The distance is about 33.000 light years, the cluster has a diameter of about 175 light years. It was discovered in 1746 and included in Charles Messier’s catalogue in 1764.

The age of this cluster is estimated at about 12 billions years.
It is one of the oldest known globular clusters.

M15 also contains Pease 1, the first planetary nebula discovered (in 1928) within a globular cluster. It is not visible in this image though.

At magnitue 6.2 it may reach naked eye visibility under very good (dark) sky conditions.

Other versions

Previous/older images:

Oct 19, 2010 – Canon 20D (10″ Newt. 1h 20m)

Image data

Object info
Name M15
Type Globular cluster
Constellation Pegasus
Right ascension 21h 29m 58s
Declination +12° 10′ 01″
Distance 33.000 ly
Other designations NGC 7078
Image info
Image date Oct. 19, 2017
Light frames 5x 3 min. RGB (each) unbinned, 11x 4 min. no filter unbinned (Luminance)
Total integration 1h 29m
Dark frames 20x
Flat frames none
Bias frames 20x
Software used SGPro, PHD2 Guiding, DeepSkyStacker, Registar, Photoshop CS6
Processing Focusing and image acquisition was done using Sequence Generator Pro.
All separate frames were calibrated, aligned and stacked in DeepSkyStacker.
Images were aligned in Registar prior to combining into RGB.
Photoshop CS6 was used for further processing.
Equipment info
Telescope Orion Optics SPX 10″ Newton
Corrector Televue 2″ Paracorr coma corrector (FL: 1.380mm f/5.43)
Mount Losmandy G-11 Gemini
Camera SBIG ST-8300M
Guide camera Astrolumina ALccd5-II (Mono)
Guide scope Vixen VMC110L f/9.4
Autoguide software PHD2 Guiding
Filters Baader 2″ RGB + IDAS LPS-P2
Location Landgraaf, The Netherlands
Image comments

Subpar focus.