C9 Cave Nebula (hydrofluoric)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: HD216380 · HD216425 · HD216532 · HD216629 · HD216658 · HD216711 · HD216898 · HD216926 · HD217035 · HD217061 · HD217086 · HD217099 · HD217312 · HD217463 · HD217657 · HD217730 · HD217872 · HD217979 · HD218066 · LBN 524 · LBN 527 · LBN 529 · LDN 1215 · LDN 1216 · LDN 1218 · PK110+01.1 · Sh2-155

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C9 Cave Nebula

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C9 Cave Nebula

Although purchased in February first opportunity to use ASIAir for deep sky imaging. Test went reasonably well, autofocusing and guiding very good however star shapes especially on periphery a little distorted which I think may have been due to pinching the optics of the field flattener. The flattener needs 118mm of backfocus at the 500mm FL of the Equinox 80 which I could only achieve by clamping the body of the flattener in the eyepiece holder rather than using a nosepiece and may have been a bit enthusiastic making sure it wouldnt fall out.

Imaged with APT

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Status	Advanced success
Started	...
PixInsight job	F1C704HQM3K2YT1SWSH4YGP0MNLVI6GD
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	22h56m40s.65
RA (top/left)	23h01m33s.93
RA (top/right)	23h04m29s.89
RA (bottom/right)	22h51m23s.17
RA (bottom/left)	22h49m21s.81

Dec (center)	+62°37′21″.10
Dec (top/left)	+61°25′52″.7
Dec (top/right)	+63°36′18″.10
Dec (bottom/right)	+63°48′08″.8
Dec (bottom/left)	+61°36′54″.3

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C9 Cave Nebula

C9 Cave Nebula

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