The sky around vdB 68 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 68 is a reflection nebula in Monoceros, 2,680 light-years away
vdB 68 is a reflection nebula in the constellation Monoceros, 2,680 light-years away. spans 14′ of sky, about 11 light-years across. It is a telescope object, 6 inches or larger, and it is highest in the evening sky in February.
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 68 is vdB 68 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 42004, B1/2(II), magnitude 9.3. He rated it moderate in brightness and blue in color.
Finding vdB 68 from Saiph
vdB 68 lies 6.1° northeast of Saiph, the magnitude 2.1 star. Three fingers held at arm's length cover about 5°.
vdB 68 is highest in the evening in February
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 southern hemisphere and north to about 84°N.
vdB 68 is 2,680 light-years away
The light seen from vdB 68 tonight left it about 2,680 years ago. It ranks 103 of 158 by distance among the Van den Bergh nebulae. Distance source: Gaia DR3 parallax of the illuminating star via AT-HYG v3.2 (820 pc).
