The Horizons object currently has a newtonian_com property and an average_com_motion method. It might be nice to include several other features needed for the LVC format, which they name
nhat: the separation vector from BH B to BH A (x_A - x_B)
omega_orbit: the orbital angular frequency
LNhat: the direction of the (Newtonian) orbital angular velocity
The
Horizonsobject currently has anewtonian_comproperty and anaverage_com_motionmethod. It might be nice to include several other features needed for the LVC format, which they namex_A - x_B)newtonian_comaverage_com_motionn⃗n̂λ̂ℓ̂chi_prec(Sec. 3 of https://arxiv.org/abs/1408.1810)SigmaandSigma__perp_λ̂(Eq. (5) of https://arxiv.org/abs/1409.4431)