A Dark Spot in the Mily Way
Dark nebula Barnard 86 and open cluster NGC NGC 6520Dark nebula Barnard 86 and open cluster NGC NGC 6520
Dark nebula Barnard 86 and open cluster NGC NGC 6520 in Sagittarius, July 24, 2025 from suburban Bloomington, Indiana
12 300 sec. exposures (1 hour total)
GSO 8" f/8 RC OTA
ZWO ASI2600MC Pro cooled color CMOS camera, gain 100, bin 2, -5C
ZWO EAF autofocuser
Losmandy GM811G mount
ZWO ASIAir Plus controller
auto-guided, Askar off-axis guider, ZWO ASI174MM Mini guide camera
Processed in Astro Pixel Processor, Lightroom, Photoshop
Tonight's Cosmic Postcard comes from the heart of the Milky Way toward the constellation Sagittarius, a compact clump of dust known as Barnard 86, next to a small open star cluster, NGC 6520, likely physically associated with each other.
Technical information
12 300 sec. exposures (1 hour total)
GSO 8" f/8 RC OTA
ZWO ASI2600MC Pro cooled color CMOS camera, gain 100, bin 2, -5C
ZWO EAF autofocuser
Losmandy GM811G mount
ZWO ASIAir Plus controller
auto-guided, Askar off-axis guider, ZWO ASI174MM Mini guide camera
Processed in Astro Pixel Processor, Adobe Lightroom
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