Test Equipment Anonymous

BU508A wrote: ↑Tue Jun 24, 2025 8:57 am Remove starlink trails:
I'd say, take some pictures shortly after, combine them and remove the starlink patterns.

Perhaps a similar approach would work for finding interesting objects.

tggzzz wrote: ↑Tue Jun 24, 2025 8:12 am I'm having difficulty understanding how you can find/select the interesting objects to examine. So many pixels, and interesting objects are often only a few pixels in size.

Ditto how starlink trails are removed.

The colorful streaks in this image are asteroids — the streaks record their movement across the sky from left to right. This image is a combination of multiple observations taken with four different filters. The asteroid moves between each observation, and each filter is assigned a different color in the composite image, resulting in the asteroids' multicolored paths.

Typically, in a deep image like this one, scientists carefully remove moving objects so they don’t impede the study of static objects. We chose to leave them in this image so you can see Rubin’s dynamic view of the sky!

tggzzz wrote: ↑Tue Jun 24, 2025 10:59 am
Exposure take 30s, which is relatively fast: https://rubinobservatory.org/explore/ho ... ks/numbers . Nonetheless there will be trails, of course.

"Time on telescope" is a scarce resource, so I imagine people will be reluctant to take the same picture multiple times. But what do I know.

Zenith wrote: ↑Tue Jun 24, 2025 4:41 pm

tggzzz wrote: ↑Tue Jun 24, 2025 10:59 am
Exposure take 30s, which is relatively fast: https://rubinobservatory.org/explore/ho ... ks/numbers . Nonetheless there will be trails, of course.

"Time on telescope" is a scarce resource, so I imagine people will be reluctant to take the same picture multiple times. But what do I know.

Since it's a publicity splash for a brand new prestige telescope, and they definitely wouldn't want to show a picture with a satellite track across it, or any other sort of blemish, I venture that the scarcity of "Time on telescope" wouldn't enter their heads.

Zenith wrote: ↑Tue Jun 24, 2025 8:09 pm Satellites are well tracked as is space junk. Commercial airliners also usually fly on predictable paths. Military aircraft are a different, but much rarer problem. It can't be all that difficult to manage time on the telescope to accommodate these things. Anyway, large numbers of satellites have been around for at least 30 years. It must be a problem that operators of large telescopes have learned to live with. I don't believe that at first light, the leaders of the Vera C Rubin Telescope project said, "Oh shit!. It works pretty well, but the images are messed up with satellite tracks, meteor trails and passing UFOs. We didn't think about that".