NGC2506 (Melotte 80, Collinder 170)
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ON IMAGE FOR FULL SIZE VIEW (3200x2400)
Scope:
Celestron EdgeHD 9.25 at f/7, Location: DAA
Observatory, Shelter Valley, CA, 13 March 2019 Camera: ST8300M (Baader LRGB filters) Exposure:
Exposure: 16 x 5 min (1x1 bin) exposure with IR/UV Block filter, 8 x 2 min
(2x2 bin) RGB exposures. Processing: Data
Collection - Sequence Generator Pro (as FITs). Exposure calibration,
LRGB registration, and stacking (Median combine - Winsorized Sigma
Clipping) - PixInsight. LRGB channel registration,
equalization and gradient removal - PixInsight. Curves, Levels, RGB
combine, Luminance layering - PixInsight. TGVNR and Multiscale Median Transform
NR - Pixinsight. Final finishing -
Photoshop. RGB calibration - eXcalibrator. This image is a RGB combine
with Luminance layering. Images processed at 3352 x 2532 resolution. Final Image size is approximately
3200 x 2400. North is to the
right in this image. The
Open Cluster in this image is NGC 2506. It is also known as Melotte 70 and
Collinder 170. It is also inthe Milky Way Star Cluster (MWSC) catalog -
[KPS2012] MWSC 1406. This is an an old star cluster greater than 1.6 billion
years old. It has a number of red stars and Red Giant Branch (RGB) stars, but it
also has a number of member stars that appear to be younger spectral types
despite its estimated age. Its distance is estimated at a little less than
11,500 light years. These objects and some bright stars are identified in the annotated
image.. This image replaces an earlier image that can be seen in
the Archives here. Horizontal FOV is
approximately 38 arc minutes (0.71 arcsec/pix image scale on the full size
image). Image center is located approximately - Equatorial 2000: RA: 08h 00m 17s Dec: -10°48'18"
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