Add satellites / other sky artifacts

[cwwalter]

Currently, we live in a blissful world without planes, or satellites, or contrails etc.

[dkirkby]

Here is an example of a plane (?) crossing the whole DECam focal plane during an exposure:

Here is a single chip where (presumably) the shutter opened or closed with the plane already in the field of view:

[aaronroodman]

Probably a satellite. Here is a plane seen by DECam (image from Steve Kent). You can see the lights blinking as it moves across the field of view, and its all blurry since the plane is so close (not at infinity). From the size of the donuts (plane’s blinkers) you can tell how far away the plane is!

[dkirkby]

@aaronroodman Your image didn't get attached to this issue. Can you paste it in here instead of attaching it to email?

[aaronroodman]

[cwwalter]

Wow. Interesting. I'm not sure I understand the relationship of the blinkers to the streak. Should they be on either side of it?

[aaronroodman]

blinkers on both wings perhaps?

[dkirkby]

Airplane lights are complicated and colorful.

[kadrlica]

There are a relatively small number of airplanes in the DES data. You can find lists under the "Airplane streaks" category on the blacklist here. Interestingly, there were relatively more airplanes in the earlier years compared to later years of the survey.