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Sh2-101 Tulip Nebula

Technical card

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

Software: PixInsight 1.8TheSkyXPS CS6

Filter: Astrodon Gen2E LRGB

Resolution: 2428x1758

Astrodon Gen2E Lum: 14x960" -30C bin 1x1
Astrodon Gen2E RGB: 48x240" -30C bin 2x2

Integration: 6.9 hours 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).




Sky plot

Sky plot


Sh2-101 Tulip Nebula,