ReserveIsolatedStarsTask is a simple task to generate a consistent selection of reserved stars.

Processing summary

ReserveIsolatedStarsTask uses a hashed string to generate a random seed to select a random subset of the total number of stars. The hash is generated from the lower 32 bits of the SHA-256 hash of a combination of the configured reserve_name and an optional extra string. In this way, consistent reserve selections can be done based on human-readable names, bands, etc, rather than relying on hard-to-remember numbers. The return value is a boolean array of the desired length, with reserve_fraction of the array set to True.

Python API summary

from lsst.pipe.tasks.reserveIsolatedStars import ReserveIsolatedStarsTask
classReserveIsolatedStarsTask(config=None, *, name=None, parentTask=None, log=None)

Reserve isolated stars with repeatable hash...


Access configuration fields and retargetable subtasks.

methodrun(nstar, extra='')

Retrieve a selection of reserved stars...

See also

See the ReserveIsolatedStarsTask API reference for complete details.

Configuration fields


Field type

float RangeField



Fraction of stars to reserve. None if == 0.


Field type

str Field

Name to use for random seed selection hash.