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.
Sharpless 155 - Cave Nebula, HaRGB image.
- 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.