The sky around LDN 152 at true scale, north up and east left, with stars to magnitude 8, the Lynds bright and dark nebulae, and the NGC and IC objects in the field. The box marks a circle of the same area as the cloud; the cloud itself is irregular.
LDN 152 is a dark nebula in Ophiuchus, 460 light-years away
LDN 152 is a dark nebula in the constellation Ophiuchus, 460 light-years away. It covers 1.04 sq deg of sky, about the area of a circle 1.2° across, or 9.2 light-years at its distance, and Lynds gave it opacity 3 of 6, faint. It is dark and large enough to show as a starless patch in binoculars from a dark site, and it is highest in the evening sky in July.
Dark nebula: a cold cloud of gas and dust, a few degrees above absolute zero, dense enough to block the light of the stars behind it. Dark clouds are where new stars form, and they show only by contrast against a rich star field.
Finding LDN 152 from Sabik
LDN 152 lies 5.1° west of Sabik, the magnitude 2.4 star. Three fingers held at arm's length cover about 5°.
A dark nebula shows only by contrast, as a patch with fewer stars than the field around it. Use the lowest power and widest field you have, from a dark site with the Milky Way high in the sky; a nebula filter does not help, because there is no light from the cloud to pass.
LDN 152 is highest in the evening in July
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 75°N, and never sets south of 75°S.
LDN 152 is 460 light-years away
The light seen from LDN 152 tonight left it about 460 years ago, around 1566 AD. Distance source: Ophiuchus (North), Gaia DR2 dust, Zucker et al. 2020 (median of 2 nearby sightlines, 142 pc).
3 Lynds bright nebulae and 37 Lynds dark nebulae lie within 5° of LDN 152
