Sh2-155 – The Cave Nebula

Sh2-155 – The Cave Nebula

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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.

Sh2-155 - The Cave Nebula Annotated
Sh2-155 – The Cave Nebula Annotated


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