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SANDQVIST & LINDROOS 17 + RCW 113 AKA GUM 55
DARK AND EMISSION NEBULA NEBULA IN SCORPIUS
(Image centered at: ra 16 h: 56 m / dec -43º 22')
June 2025, Home Backyard in Martinez, Buenos Aires, Argentina
DATA
TYPE: Dark and Emission Nebula
APPARENT SEPARATION: Sandqvist & Lindroos 15 x 7 arc minutes
APPARENT MAGNITUDE (V): n/a
DISTANCE: M1 scorpii 822 light years & M2 scorpii 517 light years
IMAGE INFORMATION
INSTRUMENT: 6" ORION OPTICS UK (Ultra Grade Optics) w/Sky Watcher Coma Corrector (0.9x) working at at f4.5
CAMERA: QHY 183 MONO
MOUNT: VIXEN GDPX, OAG with Starlight Xpress Lodestar
FILTERS: OPTOLONG LRGB Set + Antlia Ha 3 nm
SKY CONDITIONS: urban skies - Bortle 8
EXPOSURES: LRGB (45,90,45,45,45)
OBJECT DESCRIPTION AND IMAGE SESSION
An area of Dark and Emission Nebula all together. SL-17 and a partial view of RCW 113 or Gum 55 which is a much larger emission structure around open star cluster NGC 6231. Dark nebulae, also known as absorption nebulae, are clouds of gas and dust so dense that they block visible light from stars and other nebulae located behind them, creating the appearance of dark patches or voids in the sky. These nebulae are characterized by high concentrations of dust grains that absorb or scatter incoming light.
SANDQVIST & LINDROOS 17 + RCW 113 AKA GUM 55
DARK AND EMISSION NEBULA NEBULA IN SCORPIUS
HYDROGEN ALFA CHANNEL AT 50% RESOLUTION
