Imaging telescopes or lenses: Borg 90FL
Imaging cameras: ZWO ASI183MC Pro
Mounts: Celestron AVX Mount
Guiding telescopes or lenses: Agena Astro 50mm f/3.9 Guidescope
Guiding cameras: ASI224MC
Focal reducers: Borg 0.72X Quadruplet Super Reducer, #7872
Software: IDEIKI AstroPhotography Tool (APT) · Stark Labs Nebulosity 4.2 · Digital Photo Professional · PHD2 Guiding
Filters: IDAS UIBAR-III
Dates:Feb. 18, 2019
Frames:IDAS UIBAR-III: 75x20" (gain: 100.00) -15C bin 1x1
Integration: 0.4 hours
Avg. Moon age: 13.42 days
Avg. Moon phase: 97.95%
Bortle Dark-Sky Scale: 4.00
Temperature: -2.00
Astrometry.net job: 2532766
RA center: 2h 20' 41"
DEC center: +57° 7' 22"
Pixel scale: 1.361 arcsec/pixel
Orientation: 8.201 degrees
Field radius: 1.090 degrees
Resolution: 4800x3200
Data source: Backyard
The Double Cluster, NGC 869 and NGC 884 , Cadwell 14, in the constellation Perseus. Both visible with the naked eye, NGC 869 and NGC 884 lie at a distance of 7500 light years. NGC 869 has a mass of 3700 solar masses and NGC 884 weighs in at 2800 solar masses; however, later research has shown both clusters are surrounded with a very extensive halo of stars, with a total mass for the complex of at least 20,000 solar masses. Based on their individual stars, the clusters are relatively young, both 12.8 million years old. In comparison, the Pleiades have an estimated age ranging from 75 million years to 150 million years. There are more than 300 blue-white super-giant stars in each of the clusters. The clusters are also blue-shifted, with NGC 869 approaching Earth at a speed of 39 km/s and NGC 884 approaching at a similar speed of 38 km/s.
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