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-   -   September 26, 2007: Geostationary satellites (http://cellar.org/showthread.php?t=15479)

tulzscha 09-26-2007 10:29 PM

Quote:

Originally Posted by aero geek (Post 389498)
Where are the GPS satellites?

Not geostationary, so not visible in the picture.

CharlieG 09-27-2007 09:04 AM

Quote:

Originally Posted by aero geek (Post 389498)
Where are the GPS satellites?

They are not geosyc!

Anton 09-27-2007 10:05 AM

Quote:

Originally Posted by Undertoad (Post 389151)
But then, the dots that don't have any trail are geostationary satellites, in geostationary orbit.

Nah, they are just specs of dust on the camera's sensor! Space objects? Whatever next! :p

TheMercenary 09-27-2007 01:24 PM

Cool beans.

HungLikeJesus 09-27-2007 01:30 PM

Quote:

Originally Posted by CharlieG (Post 389643)
They are not geosyc!

Geosycamore?

BigV 09-27-2007 02:34 PM

neither are they geodesic.

Saphyre 09-27-2007 03:19 PM

Orbits
 
GPS Satellites operate in a Mid-Earth Orbit, approximately 1/2 of the height of the satellites shown in UT's pic. This type of orbit allows for better GPS service near the polar regions of the Earth.

<-- doesn't play the "dumb" game :D

predatormc 09-27-2007 04:28 PM

8.5 hours; the photographer must have steady hands.

glatt 09-27-2007 04:53 PM

Undertoad, I didn't mention this before, but this IotD is a great one. Good job!

It has slowly grown on me over the last couple days. I was mulling over the possibility of taking a similar image myself. I wonder what sort of equipment you need? The link says it was taken at Kitt Peak, but not which instrument was used. I wonder if it was one of the big telescopes there, or just a camera on a tripod with a long exposure? The satellites are +10 to +14 magnitude in brightness, but I don't know exactly what that means in camera exposure speak. Eight hours is a long exposure.

Looking at the link again, it says the view spans about 10% of the arc. That's roughly like a 50mm lens. You should be able to reproduce this shot in your back yard with a 35 mm camera on a tripod! (assuming a clear night.)

Cool.

dar512 09-27-2007 04:55 PM

Wouldn't you get too much light pollution there in Arlington?

glatt 09-27-2007 04:58 PM

Yeah, way too much here. I can see the planets and the moon though.

But you know, when you travel to someplace nice and have a clear night, you can do this.


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