Dust and Luminosity (and a pinch of Hydrogen Alpha emission). Blue Horsehead Nebula, IC 4592 is a reflection Nebula in Scorpius Constellation, lit by Super Massive Nu Scorpii. Captured in broadband, bortle 4 skies of Pinnacles Nat'l Park in California. 135 f2, ZWO 2600MC cooled down to -5C, Gain 100 L -55 x 180s D - 40 x 180s HEQ 5Pro, ASI120 + 30f4 for autoguiding, driven by ASI AIR Pro. . . . . #rhoophiuchi #antares #astrophotography #astronomy #astrophile #astrophotos #astrophoto #astrophotographer #nightphotography #deepspacephotography #deepspace #space #spacephotography #milkyway #milkywaychasers #milkywaygalaxy #milkywaypics #milkywayshooters #milkywaystars #newmilkyway #ioptron #rokinon #rokinon135mm #zwo #zwoasi #asiair