Messier 27 – Dumbbell Nebula
Key Scientific Data
Object type: Planetary nebula – bipolar / hourglass morphology
Constellation: Vulpecula
Other designations: M27, NGC 6853, Dumbbell Nebula, Apple Core Nebula
Distance from Earth: approximately 1,200–1,300 light-years
Physical size: approximately 2.5–3 light-years across, with a larger faint outer halo
Apparent size: approximately 8 × 6 arcminutes
Apparent magnitude: approximately 7.4
Central star: Hot white dwarf, approximately 85,000 K
Right Ascension: 19h 59m 36s
Declination: +22° 43′ 16″
Discovered by: Charles Messier, 1764
Light-travel time: approximately 1,200–1,300 years
Description
Messier 27, commonly known as the Dumbbell Nebula, is one of the brightest planetary nebulae in the night sky, located approximately 1,200–1,300 light-years from Earth in the constellation Vulpecula.
It formed when a star of low to intermediate mass expelled its outer atmosphere during the final stages of its evolution, exposing a hot stellar core whose ultraviolet radiation now illuminates the expanding gas.
Its distinctive dumbbell-shaped structure, surrounded by fainter shells and filaments, makes M27 one of the most recognisable examples of this brief phase of stellar evolution.
Why the Dumbbell?
The nebula takes its name from the characteristic appearance of its bright central region, resembling a dumbbell or hourglass.
This shape is the projected view of a more complex three-dimensional structure, with expanding lobes, shells and regions of differing gas density.
Deep observations reveal faint material extending well beyond the familiar outline, giving M27 a much larger apparent extent than its brightest central region suggests.
Hydrogen, Oxygen and the Outer Halo
M27 exhibits strong emission from ionised hydrogen (Hα) and doubly ionised oxygen (OIII).
Hα highlights the reddish filaments and faint outer structures, while OIII produces much of the characteristic cyan and blue-green emission within the nebula.
The 15h 50m of narrowband integration in this image reveal delicate extensions beyond the bright central body, providing evidence of material expelled during different stages of the progenitor star's evolution.
The Central White Dwarf
At the centre of M27 lies the extremely hot stellar remnant responsible for ionising the nebula, with an estimated surface temperature of approximately 85,000 K.
Although much hotter than the Sun, it appears relatively faint because of its small size.
Over time, the expanding gas will become too diffuse to remain conspicuous, while the central white dwarf gradually cools over billions of years.
The expelled material, enriched with elements such as carbon and nitrogen, will eventually mix with the interstellar medium and may contribute to future generations of stars and planetary systems.
Curiosities
M27 was discovered by Charles Messier on 12 July 1764 and is generally recognised as the first planetary nebula to be discovered.
Its alternative name, Apple Core Nebula, reflects the appearance of its bright central structure when the faint surrounding material is not visible.
M27 also provides a glimpse of the Sun's distant future. In approximately five billion years, our star will expand into a red giant before eventually becoming a white dwarf, potentially producing a planetary nebula of its own.
Despite their spectacular appearance, planetary nebulae typically remain visible for only tens of thousands of years, a remarkably brief interval compared with the billions of years their progenitor stars spend on the main sequence.
Looking Back in Time
The light captured from M27 began its journey approximately 1,200–1,300 years ago, during the 8th–9th centuries AD.
At that time, Charlemagne ruled much of Western Europe, while the Abbasid Caliphate was establishing Baghdad as a major centre of learning and culture.
The invention of the astronomical telescope was still approximately eight centuries away, and modern astrophotography more than a millennium in the future.
Throughout this period, the photons recorded in this image travelled across the Milky Way towards Earth, revealing the Dumbbell Nebula as it appeared more than twelve centuries ago.
Image Data
Total integration time: 17h 05m
Integration by filter:
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Red: 29m (29 × 60")
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Green: 27m (27 × 60")
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Blue: 19m (19 × 60")
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Hα: 10h 30m (63 × 600")
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OIII: 5h 20m (32 × 600")
Equipment:
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Telescope: Artesky ARTEC 250 Pro
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Camera: Player One Poseidon-M Pro
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Mount: 10Micron GM2000 HPS II
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Filters: Antlia 3nm Narrowband H-alpha Pro Highspeed 2", Antlia 3nm Narrowband Oxygen III Pro Highspeed 2", Antlia V-Pro RGB 2"
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Accessories: Pegasus Astro Prodigy Microfocuser, Player One Phoenix Wheel 7×2", WandererAstro WandererCover V4-EC
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Software: Adobe Photoshop, Pleiades Astrophoto PixInsight, Stefan Berg Nighttime Imaging 'N' Astronomy (N.I.N.A. / NINA)
For further details and the full-resolution image, visit AstroBin: