RotType

class lsst.ts.observatory.control.RotType(value)

Bases: IntEnum

Available types of rotation, i.e. the meaning of the rot_angle argument in slew operations.

Sky: Rotate with the sky. The rotator is positioned with respect to the

North axis so rot_angle=0. means y-axis is aligned with North. Angle grows clock-wise.

SkyAuto: Same as sky position angle but it will verify that the requested

angle is achievable and wrap it to a valid range.

ParallacticSky: This strategy is required for taking optimum spectra with

LATISS. If set to zero, the rotator is positioned so that the y-axis (dispersion axis) is aligned with the parallactic angle. IMPORTANT: The position is set at the start of the slew operation and the rotator will then track the sky.

PhysicalSky: This strategy allows users to select the initial position

of the rotator in terms of the physical rotator angle (in the reference frame of the telescope). Note that the telescope will resume tracking the sky rotation.

Physical: Select a fixed position for the rotator in the reference frame of

the telescope. Rotator will not track in this mode.

Attributes Summary

Parallactic
Physical
PhysicalSky
Sky
SkyAuto

Attributes Documentation

Parallactic = 2

Physical = 4

PhysicalSky = 3

Sky = 0

SkyAuto = 1