SH 2-132 Lion Nebula (Ed Stroh)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep)

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SH 2-132 Lion Nebula

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SH 2-132 Lion Nebula

This is my first image captured entirely with the CEM70 mount. I'm very pleased with the results the mount is providing. I was seeing RMS guiding numbers as low as .5". What a world of difference from the AVX I'm used to. It allows me to reveal much more and lets me move on to other issues, like perfecting the backspacing and dealing with noise.

One very valuable lesson I learned with this image is that it is possible to do linear pattern subtraction with OSC data in Pixinsight by separating the channels. I'm finding that my camera produces a lot of horizontal linear noise which is random and makes its way into my stacked masters. In particular, it seems to be most noticeable in the red channel. I ran the LinearDefectDetection script with largely default settings prior to LinearPatternSubtraction, again with largely default settings, and the results were night and day. I feel like there's still a small amount of residual linear noise but it's dramatically reduced. This will likely become a permanent part of my workflow for as long as I use this camera. If you're experiencing linear noise, I highly recommend trying it out.

One thing I would've done differently on this target is collect more data. It's a fairly faint object except for the lion's face and I don't think I did it justice with just the one night's capture time. Not sure if I need to increase my exposure time to accommodate the new, more sever filter I've been using. I'll probably run SharpCap's smart exposure tool again to see what I get. Now that I have much better guiding numbers, I can realistically expose for much longer. Either way, I'm going to try and aim for 10+hrs of total integration time on my next project.

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	Distinct awarded users	Total awarded images
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Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
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Star trails
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	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
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Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Basic success
Started	...
Astrometry.net job	6119164
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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SH 2-132 Lion Nebula

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