DIA object

Derived properties for transient and variable objects.

Schema: DiaObject table

Access

The DIA object catalog is accessible via the TAP and Butler services.

Recommended access service: TAP

TAP

  • Citation: NSF-DOE Vera C. Rubin Observatory (2025); Legacy Survey of Space and Time Data Preview 1: DiaObject searchable catalog DOI Logo https://doi.org/10.71929/rubin/2570319

  • Table name: DiaObject

  • Columns: 137

  • Rows: 1,089,818

Butler

  • Citation: NSF-DOE Vera C. Rubin Observatory (2025); Legacy Survey of Space and Time Data Preview 1: dia_object dataset type DOI Logo https://doi.org/10.71929/rubin/2570318

  • Dataset type: (‘dia_object’, {skymap, tract}, ArrowAstropy)

  • Format: Parquet

  • Number of Butler datasets: 25

Description

A “DIA object” is an astrophysical transient or variable object at a static sky coordinate.

The DIA object table is created by associating DIA sources within a 1 arcsecond radius.

The DIA object catalog contains derived per-filter variability parameters such as the minimum, mean, maximum, standard deviation and skew in the difference-image fluxes, and the light curve’s slope, percentiles, and StetsonJ parameter.

Processing

The DIA object catalog is the result of Difference image analysis (DIA).

Tutorials

See the 200-level notebook or 200-level portal tutorials demonstrating how to access the DIA object table.