B 68 (LDN 57) / B 69 (LDN 55) / B 70 (LDN 54) Dark Nebulae in Ophiuchus
Center of field at approximately: RA 17 hours 23 minutes 00 seconds, Dec -23 degrees 54 minutes 00 seconds
Size: 4.0' / 4.0' / 4.0'; Magnitude: -- / -- / --; Class: 6 K G / 6 Ir / 4 C?
North is up
West to the right
| Telescope: |
8" f5 Newtonian reflector |
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| Camera: |
ST-8XME, self-guided, binned 1x1, temp -20c & -15C, camera control MaxIm DL 4.56 |
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| Image: |
Red (Hoya 25A) filter, 230 minutes (23 x 10 minute subs), 08/27/28/2006 |
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| Processing: |
CCDStack 1.1, Photoshop 7.0 |
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| Location: |
Rolling Roof Observatory, Thousand Oaks, CA 91360 (+34d 13m 29s -118h 52m 20s) |
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| Notes: | Another view of this amazing area of the southern Milky Way. This
string of three (named) dark nebulae are just Southwest of
B 72, a portion of which can be seen at the upper
left of this image. The bright star in both images is
SAO 185357 at RA
17h 24m 04s, Dec -23d 50m 39s. The largest, darkest spot is B 68, at
upper right of center. Next, to the lower left of M 68, the two smaller
spots are M 69. Skipping over the next little unnamed spot is B 70, the
least impressive of the three. These descriptions are from the on-line Edward Emerson Barnard "A Photographic Atlas of Selected Regions of The Milky Way":
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Small,
irregular, sharply defined, diam. 4´, about 20´ SW of B 72