Add heating of a +Y or -Y face of a spacecraft component due to off-nominal roll. The
heating is proportional to the projection of the sun on body +Y axis (which is a value
from -1 to 1). There are two parameters P_plus_y and P_minus_y. For sun on
the +Y side the P_plus_y parameter is used, and likewise for sun on -Y. For
example for +Y sun:
Add heating of a +Y or -Y face of a spacecraft component due to off-nominal roll. The heating is proportional to the projection of the sun on body +Y axis (which is a value from -1 to 1). There are two parameters
P_plus_yandP_minus_y. For sun on the +Y side theP_plus_yparameter is used, and likewise for sun on -Y. For example for +Y sun:The following reference has useful diagrams concerning off-nominal roll and projections: http://occweb.cfa.harvard.edu/twiki/pub/Aspect/WebHome/ROLLDEV3.pdf.