Image of Barnard 68 in visible and near-infrared light. This image is sometimes mistakenly attributed to the Boötes Void.
Observation data: J2000.0[1] epoch
Right ascension
17h 22m 38.2s[1]
Declination
−23° 49′ 34″[1]
Distance
125[2] pc
Constellation
Ophiuchus[3]
Physical characteristics
Radius
0.25[3] ly
Designations
Barnard 68, LDN 57
See also: Lists of nebulae
Barnard 68 is a molecular cloud, dark absorption nebula or Bok globule, towards the southern constellation Ophiuchus and well within the Milky Way galaxy at a distance of about 125 parsecs (407 lightyears).[2] It is both close and dense enough that stars behind it cannot be seen from Earth. American astronomer Edward Emerson Barnard added this nebula to his catalog of dark nebulae in 1919. His catalog was published in 1927, at which stage it included some 350 objects. Because of its opacity, its interior is extremely cold, its temperature being about 16 K (−257 °C/-431 °F). Its mass is about twice that of the Sun and it measures about half a light-year across.[3]
^ abc"LDN 57". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2009-03-01.
^ abde Geus, E.J.; de Zeeuw, P.T.; Lub, J. (June 1989). "Physical parameters of stars in the Scorpio-Centaurus OB association". Astronomy and Astrophysics. 216.
^ abc"Astronomy Picture of the Day - 11 May 1999 - Barnard 68". NASA. 1999-05-11. Archived from the original on 11 April 2009. Retrieved 2009-03-01.
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