All Questions
10
questions
-1
votes
0
answers
36
views
Satellite slew rate with respect to a ground station [closed]
For a given satellite orbit and observation time, I have the vectors containing the elevation and azimuth angles of the satellite with respect to a ground station.
I know that the elevation slew rate ...
1
vote
2
answers
115
views
Determining the speed of meteor
How to determine the velocity of a meteor from two video data?
I want to try to determine the orbit of the meteor, but before that I have to determine the meteor's entry velocity and apparent radiant ...
- 11
27
votes
5
answers
6k
views
Can a planet with no atmosphere be orbited at extremely low altitudes?
Can a planet that has absolutely no atmosphere be orbited by a spacecraft at extremely low "altitudes" (if you'd even call it altitude at such a low orbit.
For instance, if this planet's ...
- 379
0
votes
2
answers
117
views
Why collisions between earth orbiting satelites do occur?
According to Kepler laws all earth orbiting satellites should have the same velocity. So how can they collide?
- 31
7
votes
1
answer
1k
views
How to find the shape of an orbit
What is the minimum information I need to be able to draw the shape of an orbit of a body that orbits the sun? With this information how can I figure out the shape of its orbit?
- 173
1
vote
1
answer
70
views
Do planets have effect on velocity of Earth?
There is method for finding extrasolar planets called Transit-timing variation. If I understood correctly, exoplanets accelerate or decelerate each other (according on their position), so we can ...
- 323
4
votes
2
answers
8k
views
Calculating object velocity at perihelion
I would like to calculate the velocity of an asteroid orbiting around a star (Sun) at the perihelion of its orbit. I know the excentricity of the ellipse and its semimajor axis.
I have found that the ...
- 183
2
votes
0
answers
55
views
Find x,y,z velocity component of a star? [closed]
I am trying to find the initial x,y,z velocity components of the Epsilon Lyrae stars. How might I go about doing this? The radial velocities are available on Wikipedia, but I am not sure how to use ...
6
votes
2
answers
1k
views
Why most planets don't spin retrograde? [duplicate]
Edit: just found duplicate
Since orbital velocity is greater on small orbits, and smaller on large orbits, why don't planets spin retrograde around their own axis?
One portion of planet's mass is ...
user16500
5
votes
1
answer
280
views
What is the optimal escape trajectory from near a black hole?
Consider a space ship that is being drawn closer to a black hole. The crew begins to notice the effects, and discovers that they are nearing the black hole. They then manage to halt their ...
- 4,381