Sharpless 155 - Cave Nebula and Surrounding Area

Sharpless 155 (the brownish nebula located below the image's center), also known as the Cave Nebula, Caldwell 9, or LBN 529, is a diffuse bright nebula within a larger nebula complex containing emission, reflection, and dark nebulosity, which is rich in color. It is located in the constellation Cepheus. The nebula gets its name "Cave Nebula" from the dark lane at the eastern side which ends at the brightest curve of emission nebulosity which gives the appearance of a deep cave when seen through a telescope visually.

Exposure Data

Instrument: Nikkor-Q Auto 135mm f/2.8 telephoto lens
F/stop: 5.6
Exposure: 11 x 10 min
Camera: Canon 350D with Baader UV-IR-Cut-Filter
Sensitivity: ISO 800
Date: September 12, 2018
Exposure start: 2:46 MESZ
Location: Wallackhaus, Carinthia
Conditions: Visual limiting magnitude 6.5 mag, SQM-L sky brightness 21.4 mag/arcsec², seeing 8/10, temperature 4°C, no wind, no dew
Autoguider: Lacerta MGEN
Enhancement: Basic data reduction, registration and combination, background flattening, color calibration, noise reduction, deconvolution, non-linearization, local contract enhancement, star size reduction
Notes: Thin clouds passing through have created large halos around bright stars and somewhat obscured the nebulae.