IC 4592 (Blue Horsehead Nebula)

This is an object I imaged twice over the years, both times during a stay at the Tivoli astrofarm in Namibia.

IC 4592, also known as the Blue Horsehead Nebula, is a reflection nebula in the constellation Scorpius.

The last time I imaged this nebula with the Rho Ophiuchi region in 2017. Data calibration, registration and the final processing was done with PixInsight. The result was as follows:

The images were taken with the following equipment:

• Date 2017
• Location: Tivoli, Namibia
• Telescope: Canon 24-105mm lens
• Focal length [mm]: 105
• Focal ratio: 4
• Mount: Astrophysics AP1200
• Camera: Canon 500 Da
• Filter: OSC
• Exposure time [min]: 408
• Resolution: 9.57″/px

The first time I imaged this nebula in 2008. Data calibration and registration was done with DeepSkystacker, the final processing was done with PixInsight. The result was as follows:

The images were taken with the following equipment:

• Date 2008
• Location: Tivoli, Namibia
• Telescope: Pentax 75
• Focal length [mm]: 500
• Focal ratio: 6.7
• Mount: Vixen Atlux
• Camera: Canon 300 Da
• Filter: OSC
• Exposure time [min]: 56
• Resolution: 3.04″/px