skyscapes.io._frames

Frame conversions for ExoVista-style barycentric -> sky-plane rotations.

Ports exoverses.util.misc.gen_rotate_to_sky_coords (convention "exovista") to JAX-friendly degrees-in-floats inputs. The math is identical: rotate by -inclination around X, then by +position_angle around Z, then flip the Z sign so that the resulting frame has +Z toward the observer.

Functions

_rot_x(angle_rad)	3x3 rotation matrix around the X axis.
_rot_z(angle_rad)	3x3 rotation matrix around the Z axis.
rotate_to_sky_coords(vectors, inc_deg, pa_deg)	Rotate Nx3 barycentric vectors into the sky frame.

Module Contents

skyscapes.io._frames._rot_x(angle_rad)

3x3 rotation matrix around the X axis.

Parameters:

angle_rad (float)

Return type:

jaxtyping.Array

skyscapes.io._frames._rot_z(angle_rad)

3x3 rotation matrix around the Z axis.

Parameters:

angle_rad (float)

Return type:

jaxtyping.Array

skyscapes.io._frames.rotate_to_sky_coords(vectors, inc_deg, pa_deg)

Rotate Nx3 barycentric vectors into the sky frame.

Matches exoverses.util.misc.gen_rotate_to_sky_coords with convention="exovista":

1. Rotate by -inc_deg around the X axis.

2. Rotate by +pa_deg around the Z axis.

3. Flip the Z component sign.

Args:

vectors: (N, 3) array of barycentric position or velocity

vectors.

inc_deg: System midplane inclination in degrees. pa_deg: System midplane position angle in degrees.

Returns:

(N, 3) array of vectors expressed in the sky frame.

Parameters:

• vectors (jaxtyping.Array)

• inc_deg (float)

• pa_deg (float)

Return type:

jaxtyping.Array