Description
This property has been Deprecated. Please use Spacecraft.SGP4.Bstar instead.
A special "drag" term associated with the Norad SGP4/SDP4 propagators. It measured in units of 1/earth radii and is related to the Spacecraft's Cd. It is obtained by having FreeFlyer import the NORAD Two-Line Element (TLE) state vector. It is also computed by FreeFlyer when a conversion from Cartesian elements to Norad element is invoked.
B* is calculated as follows:
|
Where:
•ρ0 ≡ Norad Atmospheric Density, 2.461e-5 kg/m2/RE •CD ≡ Coefficient of drag •A ≡ Spacecraft drag area in m2 •RE ≡ Norad Earth Equatorial Radius, 6378.136 km •m ≡ Spacecraft mass in kg |
Timing Precision Mode
This page describes functionality in nanosecond timing precision mode.
Click here to see the documentation for this object in millisecond timing precision mode.
Attributes
Type: |
number |
Access: |
read/write |
Units: |
er-1 |
Default Value: |
0.0002 |
Syntax
myVariable1 = mySpacecraft1.Bstar;
mySpacecraft1.Bstar = myVariable1; |
See also
Coverage and Contact Analysis Guide