Calculation results of flyby asteroids using probability density and grid search methods

The data files contain the statistical results of the required maneuver magnitudes and transfer times for designing DRO-origin asteroid flyby trajectories to 326 candidate asteroids using the probabilistic density network (PDN) method and the traditional grid search method, respectively.For the PDN-based method, three DRO departure maneuver magnitudes, namely 1.0 km/s, 1.2 km/s, and 1.5 km/s, are selected to calculate the required intermediate correction maneuvers for asteroid flyby trajectories.

In comparison, the grid search method is only performed under the 1.5 km/s departure maneuver condition.The variables in the three datasets generated by the PDN method are defined as follows:Asteroid: Target asteroid identification number or name.dvx: The x-component of the velocity increment applied at the Earth perigee, represented in normalized velocity units (VU).dvy: The y-component of the velocity increment applied at the Earth perigee, represented in normalized velocity units (VU).dvz: The z-component of the velocity increment applied at the Earth perigee, represented in normalized velocity units (VU).t_arrive: The arrival epoch at the target asteroid, expressed as the number of days relative to January 1, 2029.dayt_tran: The heliocentric transfer time from the Earth departure interface to the target asteroid, expressed in days.dv_all: The total intermediate correction maneuver magnitude required during the heliocentric transfer, expressed in km/s.The variables in the dataset generated by the grid search method are defined as follows:asteroid file: The identifier, name, or corresponding ephemeris file label of the target asteroid.t dep MJD offset: The DRO departure epoch offset relative to the reference epoch, expressed in days.r dep LU: The DRO departure position vector expressed in normalized lunar distance units (LU).v dep VU: The DRO departure velocity vector expressed in normalized velocity units (VU).phase dep DRO: The departure phase angle on the DRO, expressed in radians.alpha rad: The first direction angle of the departure maneuver, expressed in radians.beta rad: The second direction angle of the departure maneuver, expressed in radians.h peri km: The perigee altitude relative to the Earth's surface, expressed in km.r peri LU: The position vector at perigee expressed in normalized lunar distance units (LU).v peri VU: The velocity vector at perigee expressed in normalized velocity units (VU).t peri MJD offset: The perigee epoch offset relative to the reference epoch, expressed in days.dv peri km/s: The velocity increment vector applied at perigee, expressed in km/s.dv peri norm km/s: The magnitude of the perigee velocity increment, expressed in km/s.t transfer DRO2peri: The transfer time from the DRO departure point to Earth perigee, expressed in days.t transfer peri2ast: The total transfer time from Earth perigee to the target asteroid, expressed in days.t leg1: The transfer time from Earth perigee to the Earth departure interface, expressed in days.t tran: The heliocentric transfer time from the Earth departure interface to the target asteroid, expressed in days.r sphere LU: The position vector at the Earth departure interface, expressed in normalized lunar distance units (LU).v sphere actual VU: The actual velocity vector at the Earth departure interface, expressed in normalized velocity units (VU).dv sphere km/s: The velocity matching maneuver vector applied at the Earth departure interface, expressed in km/s.t arrival MJD offset: The arrival epoch offset at the target asteroid relative to the reference epoch, expressed in days.r ast HCI km: The position vector of the target asteroid in the heliocentric inertial coordinate system (HCI) at the arrival epoch, expressed in km.dv total km/s: The total additional velocity increment required by the trajectory solution, which is used as the final metric for trajectory screening and comparison, expressed in km/s.