Imaging telescope or lens: APM LZOS 130/780 f/6 LW CNC II 130mm APO
Imaging camera: FLI Microline ML8300
Mount: Takahashi EM-200 Temma2
Guiding telescope or lens: Orion Deluxe 50mm MiniGuider
Guiding camera: Orion SSAG
Focal reducer: William Optics 132/110 FLT Field Flattener
Filter: Astrodon Gen2E LRGB
Integration: 6.9 hours
Astrometry.net job: 988111
RA center: 300.140 degrees
DEC center: 35.406 degrees
Pixel scale: 1.421 arcsec/pixel
Orientation: -178.337 degrees
Field radius: 0.592 degrees
Sh2-101, the Tulip Nebula, is shown embedded in the rich Cygnus Star Cloud of the Milky Way with lots of colorful stars in this image. One of them is the visible companion of the black hole and X-ray source Cygnus X-1 which historically was the first identified black hole. It is found as the bottom star (large blue super giant HD226868) of the two vertically-arranged stars in the lower right corner of the image. Its non-visible companion of 5.6 day periodicity and 20 to 35 solar masses is almost certainly a black hole, given neutron stars cannot exceed three solar masses. The exciting star of Sh2-101 is believed to be the 9th magnitude star HD 227018 and others. Sh2-101 is at 6000 light years distance in the Orion Arm.
6.93 hr LRGB taken at D.A.R.C. Observatory, Mercey Hot Springs, CA, on 6/12/15 and 6/13/15.
3/1/16 Finally found a star reduction method that could handle this high-density field so I could bring out more of the nebula (Dave Watson's StarReduction PI script).
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