Sh2-155 (cave nebula)

 

Sh2-155, informally known as the "cave nebula," is dark cloud of gas embedded in a giant emission nebula. The top edge of the cloud is illuminated by several hot, massive (OB) stars that are part of the Cepheus OB3 association. The image was generated with observations in Hydrogen alpha (red), Luminance, Red, Green, Blue filters, from a light polluted sky in Korinthos Greece.

Technical details:

Optics: Vixen ED81s @ f/5.2

Mount: Skywatcher HEQ5 Synscan Pro (belt mod)

Guiding: ST-237 guide chip of SBIG ST2000XM

Camera: SBIG ST2000XM

Filter Wheel: SBIG CFW9

Filters: Ha,L,R,G,B

CCD Temperature: 0 degrees Celsius

Constellation: Cepheus

Date: August 1-3, 2021

Location: Korinthos - Greece - Albireo Observatory 1

Exposure:

L=12x600 min bin 1x1

R=12x300 min bin 1x1

G=12x300 min bin 1x1

B=12x300 min bin 1x1

Ha=18x1200 min bin 1x1

Calibration: Darks, Flats, Bias