Hohmann equation help

[Solistics]

Main Question or Discussion Point

I'm having some slight difficulties in calculating the delta-v in a hohmann transfer equation. I used the equation from wikipedia (which i hope is correct) but whenever i replace the variables i get an extremly small delta-v, is this normal???

$$\Delta$$v=$$\sqrt{}(\mu/r1)$$*($$\sqrt{}(2*r2/(r1+r2)$$-1))

r1=6374000 meters
r2=405500000 meters
$$\mu=9.814$$

my final result was 0.00122149m/s
it seems like a really small number, is this right or i'm i doing something really wrong?

i attached an excel sheet to show you my work.

thanks in advance

 

[Janus]

I'm having some slight difficulties in calculating the delta-v in a hohmann transfer equation. I used the equation from wikipedia (which i hope is correct) but whenever i replace the variables i get an extremly small delta-v, is this normal???

$$\Delta$$v=$$\sqrt{}(\mu/r1)$$*($$\sqrt{}(2*r2/(r1+r2)$$-1))

r1=6374000 meters
r2=405500000 meters
$$\mu=9.814$$

my final result was 0.00122149m/s
it seems like a really small number, is this right or i'm i doing something really wrong?

i attached an excel sheet to show you my work.

thanks in advance

The problem is your value for $\mu$

$$\mu = GM$$

Where G is the universal gravitational constant and is equal to

6.67300 × 10^-11 m³ kg^-1 s^-2

and M in this case is the mass of the Earth, or 5.97 x 10²⁴ kg

so

4.651 X $10^{14}m^3 s^{-2}$

 

[Solistics]

thanks for that correction.