Circular Orbit Calculator

Click on a radio button to select a Solar System object to calculate a circular orbit around. Clicking on a name between the buttons hyperlinks to Bill Arnetts' The Nine Planets web page. The formulas used below can be found at Robert A. Braeunig's Rocket and Space Technology web site.
Altitude(km):  
Sun
Mercury
Venus
Earth
Moon
Mars
Jupiter
Saturn
Uranus
Neptune
Pluto
Altitude(km):  
Select a radio button from the left radio button column, enter an altitude, click "Calculate" to calculate the values shown below. Select a radio button from the right radio button column, enter an altitude, click "Calculate" to calculate the values shown below.
Orbital Velocity (km/s) Orbital Velocity (km/s)
v = (GM/r)1/2 v = (GM/r)1/2
Orbital Period (y:d:h:m:s) Orbital Period (y:d:h:m:s)
ps = (4Pi2r3/GM)1/2 ps = (4Pi2r3/GM)1/2
Acceleration (m/s2) Acceleration (m/s2)
g = GM/r2 g = GM/r2
Escape Velocity (km/s) Escape Velocity (km/s)
vesc = (2GM/r)1/2 vesc = (2GM/r)1/2
**Note on all calculated values: r = (r [radius shown below] + Altitude [user input above]) x 1000**
The values below are the variables the program uses to calculate the above values. Clicking on a radio button sets G, M, and r below to the values for that particular solar system object, but feel free to change them. Then click calculate...
G = G - Newtonian Constant of Gravitation (m3kg-1s-2) G =
M = M - Mass(kg) of the object to calculate the orbit around M =
r = r - radius(km) of the object to calculate the orbit around r =
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