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Imaging comets with a OSC CCD?

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Helen Usher's picture
Last seen: 7 months 2 weeks ago
Joined: 26/04/2018 - 11:12
Imaging comets with a OSC CCD?

Hello all,

I'm new to gathering my own data for astrometry and photometry analysis in Astrometrica.  

I have a OSC camera on my main scope (a William Optics123FLT refractor) and so was wondering the best way to use it.  Can I use it unbinned and if so do I de-bayer and then load into Astrometrica?  And what filter setting should I use in Astrometrica?  Or would I be better binning and just using the mono output?

Or should I just use a mono camera instead??


Helen (currently gathering unbinned data on 64P ) 

djswan2002's picture
Last seen: 3 days 8 hours ago
Joined: 20/04/2017 - 19:58
OSC cameras

This is a good question - to which I can't offer you a good answer! You might want to submit your question to the comet discussion list and Nick James or another will likely pick it up quicker.

I would say that if your plate scale is around 1 arcsec / pixel or below then you might as well 2x2 bin and use the mono pics for astrometry. I'm not sure what you should do if you are correctly sampling or are undersampling.

I look forward to seeing your colour pics of Wirtanen! I've just bought a Hyperstar (Christmas brought forward) to give me a wide field of view for the close approach.

Good to hear you are imaging 64P - it's nice isn't it? And 38P is moving to a better position.


nickjames's picture
Last seen: 3 hours 26 min ago
Joined: 12/10/2013 - 18:16
Hi Helen,

Hi Helen,

David's advice is pretty much spot on.

I would de-bayer and use the green layer in Astrometrica as pseudo-V, i.e. set Astrometrica to use V band or the Gaia G band. You can then do astrometry and photometry. Have a look at the comphot page if you want to have a go at photometry. Depending on your pixel scale you can do the de-bayering by linear interpolation or simply by binning the two green pixels in each set of four. The latter is probably more photometrically correct. I have done photometry and astrometry using an ASI294MC camera and get good results.

Let me know if you need more detail on this. I hope that you decide to submit images and data to the section.