SH2-308: Dolphin Head (with Tattoo) (Brian Boyle)

Celestial hemisphere: Southern · Constellation: Canis Major (CMa) · Contains: 16 CMa) · The star Udra (ο1 CMa

SH2-308: Dolphin Head (with Tattoo), Brian Boyle

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SH2-308: Dolphin Head (with Tattoo)

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SH2-308: Dolphin Head (with Tattoo)

The Dolphin Head formed a "Pigeon Pair" with the Dragons of Ara over the last two nights observing [ed: enough of the animals get on with the AP]

Unfortunately I am much less happy with the Dolphin than the Dragons.

First, it is a much fainter targett. Even with 9 hours data it is still undercooked.

Second the bright star at the edge of the nebula shows up all the flaws in the NB filters. Particularly the ZWO Ha filter which has a very different reflection pattern to the [OIII] filter. (I suspect this may be because the difference in the AR coating. There is clearly only one way to insert the Ha filter - whereas the [OIII] can go in either way round. )

Anyhow, it difficult to motivate oneself to take even more data, when your Dolphin emerges from the gloom with a tattoo in the middle of its forehead.

[OIIi]: 72 x 300sec

Ha: 36x 300sec

11,12,13 March 2021

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Status	Advanced failed
Started	...
Astrometry.net job	8976178
PixInsight job	B56NT9FDTWOVNXZPWDN3AVH2ACLTD5M2
PixInsight queue size	n/a
PixInsight stage	PLATE_SOLVING_IMAGE

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SH2-308: Dolphin Head (with Tattoo)

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