OBJECT_ID:
B_SN1999em

OBJECT_NAME:
SN 1999em

PHASE:
B_supernova_light_curves

RAW_SOURCE:
Open Supernova Catalog / AstroCats year-bucket repository

SOURCE_REPOSITORY:
https://github.com/astrocatalogs/sne-1990-1999

RAW_FILE_URL:
https://raw.githubusercontent.com/astrocatalogs/sne-1990-1999/master/SN1999em.json

LOCAL_RAW_FILE:
B_supernova_light_curves/raw/SN1999em/SN1999em_OSC_raw.json

EXPECTED_CONTENT:
metadata
aliases
classification
photometry
references

UNNS_ROLE:
Observed post-collapse brightness trajectory.
Canonical Type II-P / plateau-regime comparison object.
Useful for constructing a recombination-plateau light-curve ladder.

BOUNDARY_DYNAMICS_INTERPRETATION:
SN 1999em provides a plateau-dominated post-collapse brightness-time record.
It is useful for studying a buffered relaxation regime after boundary failure,
where the observable light curve does not simply decline monotonically but
passes through a structurally persistent plateau phase.

SCHEMA_TARGET:
B_supernova_light_curves/B_light_curve_ladder_schema.csv

EXPECTED_CANONICAL_OUTPUT:
B_supernova_light_curves/ladders/B_SN1999em_light_curve_ladder.csv

STATUS:
Raw OSC JSON acquired.
Awaiting JSON inspection and photometry extraction.