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| Trumpler 1 |
An open cluster in Cassiopeia
Distance: 8,300 l.y.
Magnitude: 8.1v
Size:4.5'
Camera: Starlight Xpress SXVF-H9
Guider: Starlight Xpress Ex-View off-axis with Starlight Xpress Active Optics unit.
Scope: 100mm Orion achromat @ F6
Filter: Hutech IDAS-LPS
Date acquired: Aug 23, 2011
10x15sec exposures acquired, median combined and DDP stretched in Astroart 5
Image is 51'x38' north is up east to the left.
The cluster was 34 deg above the horizon at the time directly above the lights of a nearby hospital.
Photometric calibration of a single 15 second exposure showed many of the faint background stars were of 14th magnitude and a few at 15th. These were clipped while removing the background light pollution.
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