Re: FW: Shuttle water dump while attached to ISS

From: Jonathan T Wojack (tlj18@juno.com)
Date: Tue Sep 25 2001 - 11:35:49 EDT

• Next message: Atul Sowani: "Re: Satellites in moon light."

```The following interesting equations were sent by Antonin Vitek on
SeeSat-L.

> > If RCS is indicative of true cross-sectional area, drag force
> increases with
> > RCS.
> > But the EFFECT of the force decreases with more mass of the
> affected object.
>
> Exactly speaking (in equations):
> spacecraft decelaration is given as
>
> a = (1/2).cx.(A/m).rho(h).v.v

My question is: do the dots (.) means multiplication?

> where cx - aerodynamic coefficient (depending on shape of object)
> A - effective cross-sectional area of spacecraft
> m - mass of spacecraft
> rho(h) - atmospheric density at given height h
> v.v - velocity (squared)
>
> For a circular orbit with major semiaxis a, the change (decay) of
> semiaxis per orbit is given as
>
> delta a = -2.PI.cx.(A/m).rho(h).a.a
>
> Consequences: for spacecraft of silimilar shape the decay is
> proportional to the A and inversely proportional to the m (PI is
> Ludolph
> number, 3.14159265....)

------------------------------
Jonathan T. Wojack                 tlj18@juno.com
39.706d N   75.683d W
http://www.angelfire.com/stars2/projectorion
4 hours behind UT (-4)

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```

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