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Collinder 399 - Brocchi's Cluster
Collinder 399 (also known as Brocchi’s Cluster) is pretty unusual. 6 bright stars appear in a row with three below. Most of the bright blue stars are type A stars while the lower 2 are a M type star and a K type star. I was able to capture a bit of Spectra from them as well , across HIP95560, HIP95582 and HIP95498. Several dark nebulae sit in the surrounding area as well.
Location
Location: Pendleton, Oregon
Observatory: ASG Dual Dome Observatory
Bortle: 4
Equipment
Telescope: Celestron RASA 11 (620mm focal @ f/2.2)
Filters: Astronomik MaxFR 50x50mm Square SHO & Deep Sky RGB
Main Camera: ZWO ASI 6200mm-pro Monochrome
Tilt & BackFocus Adjuster: ASG Electronically Assisted Tilt (EAT)
Mount: iOptron CEM 120EC
Guide Scope: William Optics 50mm Uniguide
Guide Camera: ZWO ASI 290mm-mini
Processing Software: Captured with NINA, Stacked with Astro Pixel Processor, Processed in PixInsight
Acquisition
Date: June, 2025
R: 60 x 180 seconds
G: 60 x 180 seconds
B: 60 x 180 seconds
Total Integration time ~9 hrs
Calibration Bias: 20
Calibration Dark: 20
Calibration Flats: 20 for each filter