Sh2-155 - The Cave Nebula

narrowband nebulae

Sh2 - 155, The Cave Nebula, is a wonderful narrowband target as it includes areas of emission and reflection nebulae. The Ha, OIII, and SII data is mapped to R, G, and B channels to produce the false color image; in natural light, the Cave Nebula would appear red. Captured with a Tak FSQ106, QSI683 and 3nm Astrodon filters. 40x1200sec Ha, 30x1200sec OIII, and 30x1200sec SII – about 33 hours of total exposure.

Annotated below with the nebula, and stars brighter than magnitude 12.

Resolution ........ 2.100 arcsec/pix
Rotation .......... -6.782 deg
Focal ............. 530.30 mm
Pixel size ........ 5.40 um
Field of view ..... 1d 52' 47.4" x 1d 23' 29.4"
Image center ...... RA: 22 55 31.347 Dec: +62 26 52.85