Asteroid Photometry

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Asteroid Photometry

ghawkins
Is anyone using AIJ for time-series asteroid photometry?  The challenge is how to do time-series photometry when the target is moving, without having to result to frame-by-frame analysis.

Best regards,

Gary
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Re: Asteroid Photometry

AstroT
Hi Gary, I just posted a similar question. Did you find a way on how to solve the moving asteroid problem?
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Re: Asteroid Photometry

basilr
In reply to this post by ghawkins
A late answer to your question, yes, sort of. I almost always use AIJ for a first look at my images and try a quick plot of the lightcurve. The moving target issue can be a challenge. I use centroid aperture in AIJ and frequently (but not always!) the target is moving slow enough for AIJ to re-center on the asteroid, but not after a meridian flip, so I usually make a subset of images after the flip. One challenge is finding where the comp stars are in the subset. Also, when a background star becomes the "target" after the asteroid passes too close - because I'm using centroid apertures, well that's where I usually stop my first look, or use the single step method in AIJ.

My first post about using AIJ for asteroids was back in 2019, here:

http://astroimagej.170.s1.nabble.com/Subtracting-background-stars-for-asteroid-photometry-td1197.html

I am very happy the AIJ team and Karen have decided to re-visit using AIJ for moving targets. I recently sent her a few nights of images for 2 targets in hopes they will help move their project forward. You may want to check this thread to hear of progress. I will try to let you know if I hear anything.

http://astroimagej.170.s1.nabble.com/Aperture-photometry-of-moving-asteroid-td2499.html#a2522

Doing the measurements is one thing, period analysis is another. I do not know if they will take AIJ into the period analysis ballpark, that would be a pretty big (time consuming coding) enhancement to AIJ and may come at a later date.

Basil