IC 4592 is, despite its beauty, not very often imaged. Its proximity to another spectacular show of the same background nebula, the Rho Ophiuci area, together with its faintness, makes this an often overlooked target.
The background nebula (LDN 1721) is, in this region, illuminated by the blue (magnitude 4.13) subgiant ν Scorpii, originating IC 4592. This image has been taken with the typical LRGB filters. The images taken with the Halpha filter did not give any significant signal.
Name(s): IC 4592. The Blue Horsehead Nebula
Type: Reflection Nebula
RA: 16h 13m 00s
Dec: -19º 18’ 00”
Size (arcmin): 150×60
Distance: 420 ly
Date: 2019-04-01 to 2019-04-05
Location: iTelescope.net, SSO near Coonabarabran, NSW Australia
Size (arcmin): 175×175
Telescope: Planewave CDK 20” f/6.8
Camera: SBIG STX16803 (4096x4096pix)
Guiding: Astrodon MonsterMOAG off-axis guider
Total exposure: 11h20m (L: 5h; R: 2h; G: 2h; B: 2h20m)
Processing: CCDStack, Photoshop CC 2019