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 millisecond timing precision mode. Millisecond timing precision mode is deprecated and will be removed in a future release. We recommend that you migrate your Mission Plans to nanosecond timing precision mode.
Click here to see the documentation for this object in nanosecond 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