vdB 150 LDN 1235 (Also known as Dark Shark) is a reflection nebula visible in the constellation of Cepheus. It is located about one third of the angular separation between the stars Alfirk (β Cephei) and Alrai (γ Cephei), in a region rich in dark molecular clouds; in particular, vdB 150 represents an illuminated section of the large dark nebula LDN 1235, to which the nearby nebula vdB 149 apparently also belongs. The star responsible for the illumination of the region is HD 210806, a subgiant star of spectral class B8IV, which gives the illuminated gases a markedly bluish color; its parallax is 3.24 ± 0.63 mas , [4]which corresponds to a distance of about 308 parsecs (1006 light years ). The cloud is made up of cold dust, clearly visible in the infrared observations detected by the IRAS. The nebula that includes this and the nearby vdB 150, LDN 1235 is probably a so-called red emission nebula , that is a cloud located at high galactic latitudes that becomes visible thanks to the interstellar radiation field, with a low surface brightness and therefore from the appearance dark when viewed in the visible light band.
Target Coordinates- RA 22 h 09 m 40 s, DEC- + 73 ° 23 ′ 27 ″
Discoverer- Annie Jump Cannon
Edward Pickering.
Date 1918.
Captured from the Negev desert Israel on Sep 4 & Sep 7, 2021.
Two nights sessions.
Conditions- Bortle 3, Moonless nights, clear skies, worm weather, relatively stable skies, wind on first session and come on second session, excellent guiding on most of the nights.
Imaging Tech Details:
Lum- 44x120sec-bin1 @ -10deg C` on sensor- 1h,28m
Lum- 88x180sec-bin1 @ -10deg C` on sensor- 4h,24m
R- 24x300sec-bin1 @ -10deg C`- 2h
G- 24x300sec-bin1 @ -10deg C`- 2h
B- 24x300sec-bin1 @ -10deg C`- 2h
Total integration time for subs- 11h,52m
Bias-100, Flat-30 (no dark) were combined for each filter.
Slightly cropped- 2658 x 2112 res/pxl
Equipment tech details:
Scope- Tak FSQ85EDX.
Mount- iOptron IEQ45 Pro.
Camera- Starlight Xpress Trius SX694 mono & SX Filter Wheel.
Filters- Astrodon 36mm unmounted E series Gen2 LRGB.
Guider- SX Lodestar x2 & SX OAG.
Power & data control: Pegasus UPBv2.
Focus control: Pegasus stepper motor v2 kit.
Software tech details:
Camera & mount control- Voyager.
Guiding- PHD2.
Sky chart- Voyager web Dashboard, Frame and Mosaic tool.
Mount main control- iOptron via Ascom.
Registration, Calibration & stacking images- PixInsight 1.8.8.9
Processing- PixInsight, PS CS6.
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