TITLE:
High fidelity modeling of SRP and its effect on the
relative motion of Starshade and WFIRST

AUTHORS:
Ariadna Farres^(1), Dave Folta^(2), Cassandra Webster^(2)

(1) University of Maryland Baltimore County
(2) NASA Goddard Space Flight Center,

E-mails: ariadna.farres@maia.ub.es

ABSTRACT:
In this paper we perform a detailed analysis of how Solar Radiation Pressure (SRP)
affects the relative motion of two spacecrafts, the Wide-Field Infrared Survey Telescope
(WFIRST) and Starshade, orbiting in the vicinity of the Sun-Earth L2. While WFIRST
orbits about its own Libration Point Orbit (LPO), Starshade will fly a specific trajectory
to align with WFIRST and observe a Design Reference Mission of pre-determined target
stars. In this analysis, we focus on the transfer orbit for Starshade from one observation
to the other. We will describe how SRP affects the dynamics of the Starshade relative to
WFIRST and how relevant this effect is in order to get an accurate estimate of the total
\Delta v.