empty_observation

rubin_sim.scheduler.utils.empty_observation()

Return a numpy array that could be a handy observation record

Returns:

empty_observationnp.array

The numpy fields have the following labels. These fields are required to be set to be a valid observation

the model observatory can execute.

RAfloat

The Right Acension of the observation (center of the field) (Radians)

decfloat

Declination of the observation (Radians)

mjdfloat

Modified Julian Date at the start of the observation (time shutter opens)

exptimefloat

Total exposure time of the visit (seconds)

filterstr

The filter used. Should be one of u, g, r, i, z, y.

rotSkyPosfloat

The rotation angle of the camera relative to the sky E of N (Radians). Will probably be overridden if rotTelPos is not np.nan.

rotTelPosfloat

The rotation angle of the camera relative to the telescope (radians). Set to np.nan to force rotSkyPos to be used.

rotSkyPos_desiredfloat

If both rotSkyPos and rotTelPos are None/NaN, then rotSkyPos_desired is used. If rotSkyPos_desired results in a valid rotTelPos, rotSkyPos is set to rotSkyPos_desired. Otherwise, something else will happen–XXX.

nexpint

Number of exposures in the visit.

flush_by_mjdfloat

If we hit this MJD, we should flush the queue and refill it.

notestr (optional)

Usually good to set the note field so one knows which survey object generated the observation.