Scan

class Scan(id: int | None = None, antennas: list[Antenna] | None = None, intents: list[str] | None = None, fields: list[Field] | None = None, states: list[State] | None = None, data_descriptions: list[DataDescription] | None = None, scan_times: dict | None = None)

Bases: object

A logical representation of a single scan.

id

The scan number within the MeasurementSet.

antennas

Set of Antenna objects for antennas associated with this scan.

intents

Set of Pipeline intents corresponding to the states associated with this scan.

fields

Set of Field objects for fields associated with this scan.

states

Set of State objects for states associated with this scan.

data_descriptions

Set of DataDescription objects for data description entries associated with this scan.

Attributes Summary

end_time	Return end time of the Scan as a CASA 'epoch' measure dictionary.
spws	Return set of SpectralWindow objects for spectral windows associated with this Scan.
start_time	Return start time of the Scan as a CASA 'epoch' measure dictionary.
time_on_source	Return time-on-source for the Scan.

Methods Summary

exposure_time(spw_id)	Return exposure time for this Scan for given spectral window ID.
mean_interval(spw_id)	Return the "mean" sub-scan integration time for given spectral window ID.

Attributes Documentation

end_time

Return end time of the Scan as a CASA 'epoch' measure dictionary.

spws

Return set of SpectralWindow objects for spectral windows associated with this Scan.

start_time

Return start time of the Scan as a CASA 'epoch' measure dictionary.

time_on_source

Return time-on-source for the Scan.

Methods Documentation

exposure_time(spw_id: int) → timedelta

Return exposure time for this Scan for given spectral window ID.

Parameters:

spw_id -- Numerical identifier of spectral window to select.

Returns:

Exposure time for this Scan and given spectral window ID.

mean_interval(spw_id: int) → timedelta

Return the "mean" sub-scan integration time for given spectral window ID.

Note: at present, it is assumed that the integration time does not vary per sub-scan, and it therefore takes the integration time from the first sub-scan in this Scan to be representative (i.e. it does not take the mean from all sub-scan integration times).

Parameters:

spw_id -- Numerical identifier of spectral window to select.

Returns:

Sub-scan integration time for given spectral window ID.