vdB 131 is a reflection nebula in the constellation Cygnus, glowing faintly as its dust scatters the light of nearby stars rather than emitting its own. With an apparent magnitude of 9.84, it is a subtle, subdued target that rewards patient astrophotographers working under dark skies with long integration times. Because reflection nebulae show cool bluish tones, broadband RGB imaging tends to reveal far more of the delicate structure than narrowband filters, which are better suited to emission targets. Its position deep within the rich star fields of Cygnus means careful framing and gentle stretching are needed to keep the faint nebulosity from being lost against the crowded stellar background.
Names and Catalog numbers
- vdB 131 (van den Bergh 131)
Position and the cosmic neighborhood
vdB 131 lies in the constellation Cygnus at a right ascension of 20h 24m 15.72s and a declination of +42° 18′ 01.4″, placing it within one of the busiest regions of the northern Milky Way. This part of the sky is dense with stars, dark dust lanes, and other nebulae, so imagers will find plenty of complementary structure to include in wide-field compositions. Sitting roughly 3,300 light-years away, vdB 131 is embedded in the same sprawling molecular material that makes Cygnus such a favorite for deep-sky photography. The abundance of surrounding stars provides useful reference points for framing but also demands careful gradient control to isolate the faint reflected light.
Nice to Know
- vdB 131 is a reflection nebula, meaning it shines by scattering starlight rather than glowing from its own ionized gas, giving it characteristic cool, bluish hues in RGB images.
- At magnitude 9.84 it is a relatively faint target, best captured with long total exposure and a dark, transparent sky.
- The nebula sits about 3,300 light-years from us within the star-rich expanse of Cygnus, a region beloved by deep-sky astrophotographers.
- It carries a slight blueshift, with a radial velocity of -11 km/s indicating it is drifting toward us relative to the Sun.
Brightness, distance and size
The object has an apparent magnitude of 9.8 mag, it lies about 3,300 light-years from Earth.
