Interesting object

http://www.legacysurvey.org/viewer?ra=141.2546&dec=1.8866&zoom=15&layer=decals-dr5

Hi,

Sorry for the delay approving your post! The site was down for a while too…

My guess is that this is an asteroid – the “blue” and “green” filters (g and r) are often taken back-to-back, so a minute or two apart, and the asteroid moves during that time. Then we take the red filter (z) much later, and it’s gone.

cheers,
–dustin

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Well, there is a red blob, to the NW, and it’s sorta in a line with the blue-then-green one, so maybe that’s the asteroid too? I guess if you knew what the times for each image were, you could estimate the motion, and see if it’s consistent …

Hi,

If you click on the map, and in the popup click on “Single Image Cutouts”, you’ll get the list of the individual images that contribute, along with a link to look up that date/time/position in the JPL Horizons database. In this case, you’ll see that this object only appears in two of the individual images, and if you look up the JPL entry, it is a known asteroid, “1992 RO2”.

If you’re referring to the reddish thing in the top-right of the cutout above, looking at its Single Image Cutouts", it is stationary, so not a match :slight_smile: We usually take the z-band (red here) images days later, so asteroids move a long way. They’re scheduled that way because of moon up/down, by the way.

cheers,
–dustin

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