Card 6p - Spinning Definition in Orbit

This optional card specifies the spinning of a spacecraft or a portion of a spacecraft in orbit.

Parameters: L, NPOS, VECTOR

This card must follow the ORBADD card 6l of the corresponding orbit definition.

L

L is the code ORBSPIN (or 30)

NPOS

NPOS is the number of positions per spin. The minimum NPOS value is 2.

VECTOR

VECTOR is the vector number referencing VECTOR card 9. This vector defines the spinning axis.

Code examples

In this example, the ORBSPIN card defines spinning for the whole model.


 ORBSALL PLANET 0.35 12 0 0 0 1.1 0 0 3.6E+03
 
 ORBADD 0 360 0 0 0 0 XYZ 0 0 0
 
 ORBSPIN 8 1

The ORBSPIN card drfines 8 positions for front sides of the elements group "BUS" over which the view factors are averaged. The spinning axis is vector 2.


 ORBDEF1 1 S1 EARTH NADIR PVEL BUS 0
 
 ORBDEF2 1 8.64E+04 6.37E+09 9810 ON .3 FLUX 2.36E+02 FLUX 0
 
 ORBDEF3 1 1.3772E+03 SUNDECL 0 0 0 0 0 0
 
 ORBDEF4 1 CLASSIC AMIN 1.9E+09 ECC 0 45.000 0 LTIME 18
 
 ORBDEF5 1 0 0 -1 -1 0 0 1 0 0
 
 ORBDEF6 1 FULL AN 0 0 360 12
 
 ORBDEF7 1 0 0 0 0 0 0 0
 
 ORBSPIN 8 2

Notes

The ORBSPIN card is always associated with an orbit definition from ORBIT Cards 6k and an ORBADD Card 6l, or an ORBDEF Card 6t. The ORBSPIN card must follow the ORBADD Card 6l or the ORBDEF Card 6t of the corresponding orbit definition.

  • If an ORBSPIN card is specified, SPIN1 or SPINALL cards are generated by the DATACH module for every orbit position specified in the corresponding orbit definition.
  • If an ORBSPIN card is specified, the solar, earth, albedo, and black body view factors are averaged over each spin position.