Lunar Trailblazer Attitude Estimation Data for Robinson et al.

The files included in this dataset include the ephemerides, light curve data, attitude estimation results, and material sensitivity results for Robinson et al.: @article{robinson2025ltb, title = {Material Property Sensitivity of Light Curve Attitude Estimation for the Lunar Trailblazer}, journal = {Earth and Space Science}, note = {Submitting for the Lunar Trailblazer special issue}, year = {2025}, volume = {}, number = {}, author = {Liam Robinson and Amanda Steckel and Carolin Frueh and Bethany Ehlmann} } The data is broken up into: ephem.parquet: Ephemeris data for LTB from the JPL Horizons web service with columns: utc: The UTC datetime of each data point r_j2000_km: The position vector of LTB in the J2000 coordinate system in kilometers df_in_{gemini49,lowell310}.parquet: Light curve data from the Gemini and Lowell observatories with columns: dates: the UTC datetime of each photometric measurement ovi: The direction of the observer in inertial (J2000) space from the center of mass of LTB, unit vector svi: The direction of the Sun in inertial (J2000) space from the center of mass of LTB, unit vector irrad: The photometric brightness of LTB, reduced from the raw FITS files and rescaled [dimensionless, proportional to the observed analog-to-digital unit (ADU) counts] irrad_sigma: The standard deviation of the irrad column derived from the image background and the Poisson statistics of the photon counting process [same dimensions as irrad] epsecs: Seconds after the first observation in the current light curve {1,2}{L,G}.parquet: Local minimum attitude state estimates produced by the inversion algorithm described in the work for each of the results cases (1L, 2L, 1G, 2G) described in the work, with columns: index: The sampling index of the initial condition fun: The objective function value at the converged minimum xk: The converged state vector value x0: The initial state vector value before optimization message: The output message of the BFGS solver iterations: The number of iterations of BFGS required to reach convergence feval: The number of objective function evaluations required to reach convergence geval: The number of gradient evaluations required to reach convergence gradient: The gradient vector at xk hessian_inverse: The BFGS approximation of the inverse Hessian matrix at xk lcs: The predicted light curve signal produced by the state xk at each of the observation times epsecs: The number of seconds past the initial observation corresponding to each entry of lcs obj_file_path: The shape file path used for the inversion case substeps: The number of propagation substeps used to simulate each light curve observation self_shadowing: Whether self-shadowing effects are accounted for, always True for this work vary_global_mats: Irrelevant for this work, always False vary_itensor: Irrelevant for this work, always False cache_size: The size of the azimuth and elevation dimensions of the shadow cache cs_scale: Irrelevant for this work, always 0 n_scale: Irrelevant for this work, always 0 i_scale: Irrelevant for this work, always 0 iratios: Inertia ratios of the spacecraft finite_difference_step_size: Step size to compute gradients within BFGS mats: Materials assigned to each face of the object cds: Coefficients of diffuse reflectivity of each face of the object css: Coefficients of specular reflectivity of each face of the object ns: Third BRDF parameter (e.g., surface roughness or specular exponent) 2{L,G}_ms.parquet: The sensitivity information of the top 200 solutions to the 2L and 2G results cases to deviations in the spacecraft's surface reflectivity properties. sol_ind: Row index of the solution in the corresponding 2{L,G}.parquet file mat: The name of the material ang_{cd,cs,n}: The angular deviation in orientation expected for a 10% deviation in the coefficients of diffuse (cd) or specular (cs) reflectivity, or the surface roughness (n). period_mins_nom: The nominal spin rate of this solution in minutes period_mins{cd,cs,n}: The perturbed spin rate of this solution expected for a 10% deviation in the coefficients of diffuse (cd) or specular (cs) reflectivity, or the surface roughness (n).