PDA

View Full Version : Venus Express's unusual speed



Cassiopeia
2006-Apr-10, 11:39 AM
Hi folks,


I just read the news on

http://www.esa.int/esaCP/SEM0UGNFGLE_index_0.html (http://www.esa.int/esaCP/SEM0UGNFGLE_index_0.html)
where they say

after having travelled 400 million kilometres in only about five months


Hmmmmmm..... as far as I know the "usual" velocities for spaceships is something about 30000km/h (without swingbys - gravity assist maneuvers and so on).
The trajectory seems to be "direct" to Venus. And for me 400.000.000 / 5 months / 30,5 days / 24 hours gives AROUND 110.000 km/h!!! :confused:

How is that possible??? (without any flyby....) :think:
Cheers.


Didi

gwiz
2006-Apr-10, 12:38 PM
Depends what your "usual" speed is relative to. I think they're quoting Venus Express relative to the sun, so you have to consider the earth's orbital velocity to see if the probe is doing anything unusual.

Cassiopeia
2006-Apr-10, 12:42 PM
OK,


good answer - I think you've got it to a T!

Thanks!


Didi.

publiusr
2006-Apr-12, 09:48 PM
Chalk another up to good old R-7.