B 84a (LDN 302) Dark Nebula in Sagittarius

Located at: RA 17 hours 57 minutes 36 seconds, Dec -17 degrees 39 minutes 57 seconds

Size: 16' Magnitude: -- Class: 5 C

North is up

West to the right


8" f5 Newtonian reflector


 ST-8XME, self-guided, binned 1x1, temp -15c, camera control MaxIm DL 4.56


Lumicon Red filter, 250 minutes (25 x 10 minute subs), 09/2/3/2008; seeing 3.0-3.8 FWHM per CCDStack


CCDStack 1.3.7, Photoshop 7.0


 Rolling Roof Observatory, Thousand Oaks, CA 91360 (+34d 13m 29s -118h 52m 20s)

Notes: This description from the on-line Edward Emerson Barnard "A Photographic Atlas of Selected Regions of The Milky Way":


α(2000)17h 57m 37s, δ(2000) -17 41
Galactic Coordinates 11,+3
 Round, diam. 16, with extension 3/4 S, BD-174967 (9.1 mag) in center, perhaps some detail in it