Interesting object

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That’s an issue of one of the i-band images: - a practicually overexposed one.


Sorry how is this overexposed? It seems the same in all bands (with slight variation). Could this not be a binary star system? Or overlapping foreground and background pair?

I think what happened is that the time for the i-band to reach was longer than the other exposures, h, the exposure was less subtracted, or something else. as i stated that one of the i-band exposures had an issue.

This is what im referring to.,1713,100,100

yes but in all exposures of all bands there is this double object. Their comparative luminosity also changes over bands which could indicate a binary system afaik. Can anyone weigh in on this? @tombickle

There are some other individual i - band exposures roughly near the same time (2021-03-10) in some of the i - band exposure.

Gaia kinematics show they are both at approx the same distance and very similar proper motions. Almost certainly a binary system.


Okay, thanks for pointing this out. I would like to ask Dustin if one of the i-band images has a problem…

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I would have guessed that one of the i-band images has a much larger seeing that the rest.
In the single exposures, “decam i 975280” looks wider than the rest… it’s reported to have a seeing of 1.6", which is not great but not that bad, but I guess enough to produce this effect…

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Ah cool. Is there any specific catalogue that usually houses binary systems?

SUPERWIDE (I think its called) in vizier usually has the obvious gaia ones.

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