VdB 142 – The Elephant’s Trunk Nebula
Key Scientific Data
Object type: Dark nebula – bright-rimmed molecular cloud and star-forming region
Constellation: Cepheus
Other designations: VdB 142, IC 1396A, Elephant’s Trunk Nebula
Host nebula: IC 1396
Distance from Earth: approximately 2,400 light-years
Length: approximately 20 light-years
Associated stellar cluster: Trumpler 37
Main ionising star: HD 206267
Notable features: Dense molecular pillars, bright ionisation fronts and embedded young stars
Right Ascension: approximately 21h 39m
Declination: approximately +57° 30′
Light-travel time: approximately 2,400 years
Description
VdB 142, commonly known as the Elephant’s Trunk Nebula, is a dense cloud of interstellar gas and dust located within the vast IC 1396 emission nebula in the constellation Cepheus, approximately 2,400 light-years from Earth.
Extending about 20 light-years, its distinctive elongated silhouette resembles an elephant’s head and curling trunk against the surrounding glowing hydrogen.
The cloud is being sculpted by intense ultraviolet radiation from nearby massive stars, while its dense interior contains young stellar objects and regions of ongoing star formation.
Inside the IC 1396 Complex
The Elephant’s Trunk belongs to the enormous IC 1396 star-forming complex, illuminated by the young stellar cluster Trumpler 37.
One of its principal sources of ultraviolet radiation is HD 206267, a massive multiple-star system whose energetic photons ionise the surrounding hydrogen, producing the characteristic Hα emission.
The resulting contrast between glowing gas and obscuring dust makes the intricate structure of VdB 142 particularly striking.
A Cloud Sculpted by Stellar Radiation
The Elephant’s Trunk owes its unusual shape to photoevaporation, a process in which energetic radiation gradually heats and disperses the exposed surfaces of molecular clouds.
Denser regions resist erosion longer than the surrounding material, forming elongated pillars and bright-rimmed structures.
Similar processes have shaped the famous Pillars of Creation in the Eagle Nebula (M16).
A Stellar Nursery
Despite being progressively eroded, VdB 142 remains an active star-forming environment.
Radiation from nearby massive stars can compress parts of the molecular cloud, potentially triggering gravitational collapse and the formation of new stars.
Infrared observations reveal young stellar objects hidden within the dust, some surrounded by circumstellar discs that may eventually develop into planetary systems.
The Elephant’s Trunk therefore illustrates how stellar feedback can simultaneously disperse molecular gas and influence new star formation.
Curiosities
The Elephant’s Trunk is one of several dense globules distributed throughout IC 1396, but its distinctive shape makes it particularly recognisable.
This image combines Hα and OIII narrowband observations with broadband data, revealing different physical components of the nebula.
Hα traces ionised hydrogen, while OIII highlights emission from doubly ionised oxygen. Faint blue reflection nebulosity originates instead from starlight scattered by interstellar dust.
The result is a detailed view of the interaction between ionised gas, obscuring dust and stellar radiation.
Looking Back in Time
The light captured from VdB 142 began its journey approximately 2,400 years ago, around 400 BC, during Earth's Classical Antiquity.
At that time, ancient Greece was experiencing a remarkable period of philosophical and scientific development, with figures such as Socrates and Plato, while Rome was still a Republic.
Over the following centuries, empires rose and fell, modern science emerged, and astronomical instruments evolved from the first telescopes to highly sensitive digital cameras.
Throughout this period, the photons recorded in this photograph were travelling across the Milky Way towards Earth, revealing the Elephant’s Trunk as it appeared more than two millennia ago.
Image Data
Total integration time: 19h 28m
Integration by filter:
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L-Pro: 1h 27m (29 × 180")
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Red: 1h 42m (34 × 180")
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Green: 3h 39m (73 × 180")
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Hα: 7h 20m (44 × 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: ToupTek ATR2600M
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Mount: 10Micron GM2000 HPS II
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Filters: Optolong Blue 2", Optolong Green 2", Optolong H-Alpha 3nm 2", Optolong L-Pro 2", Optolong OIII 3nm 2", Optolong Red 2"
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Accessories: Pegasus Astro Prodigy Microfocuser, ToupTek AFW-L 7×2", WandererAstro WandererBox Pro V3
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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: