RGB OOH of SH2-132 Lion nebula (Tim Hawkes)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep)

RGB OOH of SH2-132 Lion nebula, Tim Hawkes

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RGB OOH of SH2-132 Lion nebula

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RGB OOH of SH2-132 Lion nebula

0.9X SW flattener/ reducer to bring the F 5.0 SW PDS200 down to F 4.5 (1.05 arcsec/ pixel) to just about fit most of the nebula into the FOV.

83 x 40s (UHC Astronomik filter) OSC AS1294 MC frames, 124 x 3 min OIII frames (6 nm Astronomik) and 106 x 3 min HA (7 nm Optolong) AS1294 MM frames all captured using Sharcap 4 and guided using PHD2 on a CEM70 mount. A useful feature of Sharpcap here was the ability to reliably centre this particular field.

Alignment, tilt and spacing seems to have been pretty good with near round stars right to the edge of the field - which speaks well of the performance of the SW 0.9X reducer/ flattener.

I think that this is a really interesting object. The two main drivers of ionisation are the Wolf Rayet stars HD211853 (WR153ab) with what appears to be a peculiar near straight ray of OIII - possibly part of a stellar wind-driven blue ring and - on the tail side- HD211564 which is surrounded by an expanding shell of - unusually - predominantly blue OIII light. Similar to in planetary nebulae the stellar electron temperature must be high enough to drive such high emission of OIII but the scale of these Wolf Rayet-driven OIII nebulae appears far greater - judged from their angular size at a distance of 15,000 ly maybe some 80-150ly across ?

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RGB OOH of SH2-132 Lion nebula

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RGB OOH of SH2-132 Lion nebula

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