My Astrophotography – Messier 15 (Great Pegasus Cluster)

Messier 15 (Globular Cluster)

  • M15 has one of the densest cores of any Milky Way globular cluster – a classic example of core collapse, where stars sink inward over billions of years.
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  • Special Feature
    M15 contains Pease 1, the first planetary nebula ever discovered in a globular cluster ~ only three others are known in all globular clusters. (M15, M22 and NGC 6441).

  • Object Name
    M15

  • Object Type
    Globular Cluster

  • Constellation
    Pegasus

  • Magnitude
    +6.4

  • Distance
    50,000 light-years

  • Age
    12 million years old

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Equipment

Telescope:

Mount:

Accessory:

Celestron 8-inch Edge HD

ZWO AM7 (equatorial mount)

ZWO ASIair Plus / PixInsight

Camera:

Guiding:

Filter:

ZWO ASI2600MC Pro cooling

ZWO ASI1290MM

2″ Optolong L-Pro

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Bortle Scale: Kirby Farm, Shipston-on-Stour, Warwickshire (Bortle: 4.6)
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Integration

  • Date:
    Saturday 12th September 2026
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  • Time: 01:00 am
  • Moonlit:
    Waxing Crescent 1 days old
    Magnitude: -5.0
    Moonlit: 3%
  • Total:
    60’s x 30 subs = 30 minutes

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Constellation :- Pegasus (The Winged Horse)

Object :-

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Object :-

Other name :-

Type :-

Magnitude :–

Distance :-

Constellation :-

Right Ascension :-

Declination :-

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M15

NGC 7078 / The Great Pegasus Cluster

Globular Cluster

+6.4

50,000 light years / 250 light years across

Peg (Pegasus / The Winged Horse)

21h 30m 04s

+12° 10′ 54″

Enlarge on click the map.

(Click the map above for a large view.)

Abbreviation:  Peg (Pegasus)
English Name:  The Winged Horse
Genitive: Markab
Hemisphere: Northern Hemisphere
Location: Between the constellations of Pisces and Vulpecula.
Visible between latitudes:  +90 and -60 degrees
Best season: Autumn
Seen in three seasons: Summer, Autumn & Winter
Best seen in:  October (map)
Seen between: August and December
Right Ascension (RA): 22 hour
Declination (DEC): +20 degrees
Area (square degrees):  1,121 (7th)

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Messier 15 – The Black Hole Connection

  • The Centre – astronomers believe an intermediate-mass black hole, roughly 4,000 times the mass of the Sun ~ may lurk at the very core of Messier 15.
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