Have you been able to track on the head of C/2022 E3 ZTF

[johncd...@gmail.com]

I'm going to make my 1st effort at getting data on C/2020 E3 ZTF tomorrow night, and I was wondering if folks have been able to guide on the comet head successfully?  I'll be using an Orion 50mm finder with a ZWO ASI290mm camera.  I'd rather guide on the comet if possible, rather than use the OAG and try to use the training procedure in PHD2 to train the guider.  But I was wondering what other folks have had success with so far.

Thanks,

John D.

[Brian Valente]

HI John

Yes I've done that in the past, using NINA's Orbital plugin which can automatically send the tracking rate to PHD.

However.... do you really want to do that? In my experience comparing the two, and the the good comet images I've seen, people are tracking in sidereal. with shorter exposures it's easier to manage the stars this way than if you guide on the comet. I've done it both ways for Panstarrs and it was much easier at sidereal and i didn't see any difference in the result other than comet tracking had elongated stars

 

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Brian Valente

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[Tony Cooper]

I would suggest that you look at the guiding corrections and calculate how much the comet will move during your exposure. If it moves more than, say, 0.25 pixels then your exposure is too long or you should turn on the corrections.