NGC 7790 and NGC 7788 in Cassiopeia



Scope: FSQ-106N 106 mm refractor at f/5, Location: Laguna Mountains, CA   15 September 2012  Camera: Artemis285

Exposure: 13 x 3 min  (1x1 bin) exposure with UV/IR block, 8 x 1.5 min (2x2 bin) RGB exposures.

Processing: Data Collection -  Artemis Capture (as FITs).  Calibrated, stacked (Sigma Combine), Central Gradient removal, LRGB channel registration, equalization - Astroart.  Curves, Levels, LRGB combine and finishing  - Photoshop. This image is a straightforward LRGB combine with Luminance layering.     Final Image size is approximately 1800 x 1345.

North is up in this image. NGC 7790 and NGC 7788 are open clusters in the constellation of Cassiopeia. They are at least visually closely aligned, however, their distances from Earth is uncertain.  Cluster NGC 7790 is in the lower left; NGC 7788 is in the upper right. NGC 7790 is astronomically important in that it contains three classical Cephid variable stars - as such it could help determine a zero distance point for these special stars used in galactic distance measurement. This image replaces an earlier image that can be seen in the Archives here. Horizontal FOV is 55'

Image center is approximately - Equatorial 2000: RA: 23h 57m 35s Dec: +6119'09"


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