R-band Starcounts for SIM

The following plots show the expected R-band starcounts for a low, moderate and high galactic latitude field. The counts can be used to estimate the number of field giants that SIM will need as astrometric reference stars.

l = 90 deg, b = 90 deg

l = 90 deg, b = 30 deg

l = 90 deg, b = 10 deg