Messier 42

Here’s an M42 from earlier this week.

On Monday night, with a very bright moon I took some Ha shots. M42 can be quite a tricky target because there’s such a difference in brightness between the centre and outlying areas, so this is a mix of 1 and 10 min exposures with the Ha filter. Unfortunately the clouds were rolling over quite frequently, and of 15 10 mins shots, only 3 were actually usable- this has given me a very noisy Ha channel to work with.

I had a bit more luck on Thursday night, before the moon came up, capturing 1 and 5 min exposures with the IDAS filter that I use to suppress the bright LED lights. Merging mixed exposure times is a new technique for me, so I’m quite pleased with how it has come out. The trapezium can’t quite be seen, but there’s still a reasonable amount of detail in the bright sections that surround it. The hardest bit was reducing the noise in the final colour image- I’ve lost a bit of detail doing this. Ah well- gives me something to aim for next year…

18/2/19 – Ha – 30x 1 mins, 3x 10 mins

21/2/19 – RGB – 12x1mins, 54x 5mins

5 Responses

    1. Thanks Geoff. I’m using Pixinsight for these and it has some special processes for integrating different exposures and then processing High Dynamic Range objects. More than happy to show you hoe it works (although I often need to refer to the instructions myself! Intuitive it is not…)

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