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Old 03-04-2024, 02:40 PM
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muletopia (Chris)
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NGC 5189 lots of stars little nebula!

Hello Folks,
Last night's effort.
OTA Takahashi Mewlon 250



camera QHY8l gain 3 offset 135
10 * 300 second exposures



guiding PHD2 just average , .3 arc seconds plus/minus


Mount Mesu mount MK 1


Location back yard observatory


No moon
processed with APP Astro Pixel Processor

More time on the subject will probably help the detail in he nebula, what else should I try?
Suggestions please.
Chris
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Last edited by muletopia; 03-04-2024 at 09:30 PM. Reason: add APP
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Old 03-04-2024, 09:38 PM
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Mark_Heli (Mark)
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Great picture. Planetary nebula are always fun targets with their unique shapes & colours.

Cheers,
Mark
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Old 03-04-2024, 10:11 PM
Dave882 (David)
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Hi Chris thatís a really solid start. Great colour coming through and quite a bit of detail for only an hour of data. Iíve been having a lot of fun the last few months imaging a few PNs - theyíre challenging targets but super cool and thereís so much variety.

So regarding your question- Iíve never imaged this one but if it were me approaching this target, Iíd probably approach it like this:
1) Check out some of the best images online and see what kind of filters ar being used. I did a quick search and itís defiantly going to suit a dual narrowband (Ha/Oiii) filter.
2) if you have the dual narrowband filters, using APP you can do a channel extraction to extract the respective signal. Lots of processing advantages doing this especially if you bring it into a program like PI.
3) you might well need 5min or even longer subs to reveal the PN, but shoot stars in rgb with much shorter subs to keep them under control. Itís a pretty dense field so you also have the control to pull them back a bit too if you process them separately.
4) depending on the signal coming through, I normally aim for at least 15hrs in the suburbs for narrowband. longer for broadband. It just makes processing so much easier with more signal you donít feel like you need to force it. But depending on your appetite for the target and the weather I guess you just get what you can.
5) for the small targets with fine detail, some nights just wonít work out. If the seeing is mush itís better to shoot something else.

Hope some of that can be helpful.
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Old 04-04-2024, 10:21 AM
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muletopia (Chris)
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more frames

David, thanks for your extensive and informative reply.
As a first step I collected another hour's worth of data last night with the same setup as the previous nigh and processed the combined data. The background noise is less.I used less saturation and this has really helped in taming the stars.

Yes I have seen many published good photos and read the details of their acquisition.But I do not have any filters so that path is not available to me.I have always assumed that with my Bortle 1 location I did not need any, so pennies to save for filters.
Anyway attached is the 20 frame result.
Chris
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Old 04-04-2024, 10:26 AM
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here is the picture

bad button press last time!
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Old 04-04-2024, 11:30 AM
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mre processing

This edition of the picture is the last one further processed in Nebulosity.
Chris
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