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Finally! My Best Guiding Yet!

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6 replies to this topic

#1 jt_3232

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Posted 03 July 2020 - 04:33 AM

I was able to achieve a good set of images today where I did not have to throw any away. I remember my first ever astro target, I threw away over half of the images. 

 

Check out a couple of my typical graphs. Any suggestions are welcome!

 

Orion Atlas EQ-G

Meade Series 5000 ED80 480mmFL F/6

ZWO OAG and ASI224MC as guide camera

Using EQMOD and PHD2. Tried a PEC for the first time too.

 

Thanks,

 

JT

 

phd2 guiding graph.jpg

 

 

phd2 guiding graph2.jpg


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#2 imtl

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Posted 03 July 2020 - 06:04 AM

Happy for you. Your RA and DEC minmo are too low for your RMS which is causing you to correct too often. You DEC aggressiveness is extremely high. You should ease it a lot.



#3 Tapio

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Posted 03 July 2020 - 06:11 AM

You can tweak more but if you are getting round stars be happy and don't worry.


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#4 ChrisWhite

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Posted 03 July 2020 - 06:39 AM

Think of min/mo as a seeing setting. If seeing is very good you can lower this value. If seeing is very bad you can increase.

You are correcting (overcorrecting) frequently. Try increasing min/mo and lower your RA aggressiveness.

With RA error twice that of DEC I can't imagine you are getting round stars unless your inaging camera is significantly undersampled.

Edited by ChrisWhite, 03 July 2020 - 06:39 AM.


#5 jt_3232

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Posted 03 July 2020 - 11:31 AM

Thanks guys, I think I just had those settings there because they were defaults. I figured lower aggressiveness might help, but I just didn't change it. I'll adjust the MinMo and see how well that helps. As the night went on, the DEC got better and better. Was this because M31 was getting higher and the SNR was going up? Maybe. Or maybe it was the DEC motor was happier higher up.

 

I think I am indeed undersampled as I use a ZWO ASI1600 in the scope.



#6 sn2006gy

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Posted 03 July 2020 - 12:49 PM

1.63" per pixel, your stars will be fine.

 

My seeing last night was terrible because of the dust and my guiding was terrible, but stars still came out round :)

 

The beauty of widefield with nice fat pixels! Very forgiving but still looks great



#7 Stelios

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Posted 03 July 2020 - 04:33 PM

Running Guide Assistant every time helps get best MinMo values. Worth wasting a couple of minutes on. 

 

But basically, if it ain't broke, don't fix it. 


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