The sky around vdB 12 at true scale, north up and east left, with stars to magnitude 8. The circles show the field of a low-power eyepiece and of 10×50 binoculars.
vdB 12 is a reflection nebula in Perseus, 930 light-years away
vdB 12 (LBN 734, Ced 12, DG 14) is a reflection nebula in the constellation Perseus, 930 light-years away. spans 10′ of sky, about 2.7 light-years across. It is a telescope object, 6 inches or larger, and it is highest in the evening sky in December.
Nebula: a cloud of gas and dust. Emission nebulae glow on their own, lit by ultraviolet light from hot young stars; reflection nebulae shine by starlight scattered from dust; dark nebulae block the light behind them.
vdB 12 is vdB 12 in the Van den Bergh catalog of reflection nebulae
Sidney van den Bergh listed it in his catalog of reflection nebulae (1966), drawn from the Palomar Sky Survey. He chose nebulae lit by a star bright enough to appear in the Bonner and Cordoba star catalogs. The star that lights it is HD 21110, K4III-IV, magnitude 7.3. He rated it moderate in brightness and moderately red in color.
Finding vdB 12 from ζ Per
vdB 12 lies 6.1° west of ζ Per, the magnitude 2.8 star. Three fingers held at arm's length cover about 5°.
vdB 12 is highest in the evening in December
The chart gives its height above the horizon at 9 pm through the year, from 60°N to 40°S. It can be seen from the whole northern hemisphere and south to about 58°S, and never sets north of 58°N.
vdB 12 is 930 light-years away
The light seen from vdB 12 tonight left it about 930 years ago, around 1096 AD. It ranks 35 of 158 by distance among the Van den Bergh nebulae. Distance source: Gaia DR3 parallax of the illuminating star via AT-HYG v3.2 (285 pc).
