IC 4592, THE BIG BLUE HORSEHEAD NEBULA

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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.

Additional Information

Object

Name(s):  IC 4592. The Blue Horsehead Nebula

Type: Reflection Nebula

RA: 16h 13m 00s

Dec: -19º 18’ 00”

Constellation: Scorpius

Size (arcmin): 150×60

Magnitude: +3.9

Distance: 420 ly

Image

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

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