The Triana Mission-next generation systems architecture ready for flight

Solar Sail Formation Flying for Deep-Space Remote Sensing

“…This provides a comprehensive and synoptic view of the Earth, enabling the development of our understanding of the Earth's climate system. Such Earth observations from L 1 are both useful and feasible for remote sensing, as highlighted in the Triana mission concept [1]. A solar sail that uses solar radiation for propulsion is known to be effective in maintaining orbits about and above such libration points [2][3][4].…”

“…In addition, practical trajectories that pass close to the Earth and wind onto these periodic orbits above the ecliptic are identified. Nomenclature a = semimajor axis a s = solar sail acceleration, m=s 2 a x , a y , a z = components of solar sail acceleration such that a s a x ; a y ; a z T , m=s 2 e = eccentricity of the Earth's orbit about the sun e 0:0167 f = true anomaly of the Earth about the sun, rad G = universal gravitational constant, 6:673 10 11 m 3 kg 1 s 2 m 1 = mass of the sun, 1:98892 10 30 kg m 2 = mass of the Earth, 5:9742 10 24 kĝ n = unit normal to the sail p = semilatus rectum t = dimensionless time r = position vector of the solar sail in the rotating frame, astronomical units (AU) r 1 = position of the solar sail with respect to the sun, AU r 2 = position of the solar sail with respect to the Earth, AU V = velocity vector of the solar sail X, Y, Z = rotating coordinate frame, AU x, y, z = rotating-pulsating coordinate frame, AU = solar sail lightness-number ratio of solar sail radiation pressure acceleration to solar gravitational acceleration 0:05 = the angle that the sail normal makes with the y axis, rad = the angle that the sail normal makes with the x axis, rad = distance between the sun and the Earth, AU = dimensionless mass of the Earth, 3 10 6 ! = angular velocity vector of the rotating frame I.…”