B 64 (LDN 173) Dark Nebula in Ophiuchus

Center of field at approximately: RA 17 hours 17 minutes 38 seconds, Dec -18 degrees 29 minutes 18 seconds

Size: 12; x 8.0' Magnitude: -- Class: 6 Co

North is up

West to the right


 8" f5 Newtonian reflector


  ST-8XME, self-guided, binned 1x1, temp -20c, camera control MaxIm DL 4.56


Lumicon Red filter, 490 minutes  (49 x 10 minute subs), 08/10/11/12/14/2009; seeing 2.7-4.8 FWHM per CCDStack


CCDStack, Photoshop 7.0


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

Notes: B 64 is centered in this image ... the Dark Lane to the SSE (lower left) seems to be LDN 175. The CDS position for B 64 is 17h 17m 24s, -18d 31m 00s, the position for LDN 175 is 17h 18m 12s, -18d 31m 11s. My software (Megastar v5.0.12) lists B 64 at 17h 17m 19s, -18d 31m 03s, and the approximate position of the area of LDN 175 as 17h 18m 14s, -18d 40m 25s. M 9 is the Globular Cluster to the east (left).

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

α(2000)17h 17m 18s, δ(2000) -18 30
Galactic Coordinates 5,+11
 Cometary, W of M 9. This object is somewhat cometary in form and has a very black core or head that sharply abuts against the thick stratum of stars; from this it spreads out into a large dark area with much dark detail, filling quite a space close southwest of M 9. It thus resembles a dark comet with a dense and well-defined head and diffused widening tail. The position of the head is a = 17h 9m 57s, d = -1820'.6.