Subject: AGZ0002ch9

Subject AGZ0002ch9 Full subject data (JSON)

Comments

by underearth

red and green? why?

Posted March 30, 2013 4:24 PM
by ElisabethB moderator

There is even a blue part ! This is probably a fast moving asteroid.
See the next post for zoomed out and rotated pic.

Posted March 30, 2013 4:32 PM
by ElisabethB moderator

http://skyservice.pha.jhu.edu/DR8/ImgCutout/getjpeg.aspx?ra=239.64798649&dec=38.41779927&scale=0.79224&width=512&height=512&opt=&query=

Posted March 30, 2013 4:32 PM
by lostlens

#artifact satellite trail

Posted July 1, 2014 10:16 PM
by planetaryscience

might it possibly be a geostationary satellite?

Posted July 23, 2014 3:24 AM
by Budgieye moderator

fair question, geostationary satellites do "wobble" a bit see http://www.galaxyzooforum.org/index.php?topic=278575.msg512640 #msg512640

Posted July 23, 2014 6:08 AM
by Budgieye moderator

But then I might expect to see more nearby, since there are so many of them up there. Slow moving, so probably medium or high earth orbit.

Posted July 23, 2014 6:12 AM
by c_cld

There are also many rockets launchers of Cosmos , Molnya ,... satellites >= 34000km above earth at angular velocity ~6-12"/s

Posted July 23, 2014 8:50 AM
by c_cld

That yields a trail of ~6-12' on a filter pic. To get a 1' trail or less, few satellites are there above 130000 km: ex. Integral or Geotail

Posted July 23, 2014 8:56 AM
by c_cld

Have in mind an SDSS filter pic of the moon would show a trail of ~29.6 arcsec

The moon is drifting eastward ~13degree/day

Posted July 23, 2014 9:06 AM
by planetaryscience

so your conclusion is..? By the way, using the grid tool it appears that each line is about 22" long.

Posted July 23, 2014 3:27 PM
by c_cld

using Aladin in each filter gives 19.08" for 53.9s i.e. angular velocity of 0.318' / s

corresponding to satellite distance ~25000-27000km

Posted July 23, 2014 4:34 PM
by c_cld

In this satellite category you have for example

Insat 4A A5Rk (28913 2005-049-C) Orbit: Shape 659.0 km x 35808.3 km, Period 640.4 mn

Posted July 23, 2014 4:46 PM
by planetaryscience

thanks C_cld.

Posted July 23, 2014 7:27 PM