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Results tagged with visibility-of-spacecraft
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user 15906
questions about how visible spacecraft are, as seen from Earth or anywhere else, as seen by eye or by imaging systems.
4
votes
Were photographs or optical measurements of orbital craft from the ground ever used during e...
The Baker Nunn camera used a very special film format, ten inches of 55 mm wide cinemascope film, (254 mm by about 46 mm.)
From http://bollerandchivens.com/?p=561
So photographic plates or sheets of …
- 49.5k
3
votes
Have lasers ever been used to track laser-reflective parachute cloth for spaceflight mission...
I think it is a retroreflective material like that used for High-visibility_clothing. There are reflective tape originally developed by 3M. A reflective coating of tiny glas spheres is used as retrore …
- 49.5k
6
votes
Are crewed spacecraft missions that appear stationary from the ground possible?
To be stationary above ground we need an orbit with a period of about 24 hours ( exactly 23 hours, 56 minutes and 4 seconds, one sideral day). Such an orbit is called GEO and is 35,786 km above ground …
- 49.5k
6
votes
How do rocket propellant combinations rank in terms of "brightness"?
The different brightness is caused by the fuel. The liquid fuel rockets burn hydrogen with oxygen, both are gases and the reaction product is hot water vapour, also a gas. But pure gas flames emit ver …
- 49.5k