DR19 includes newly released information about targets that BHM selected for observation during the first year of plate operations at APO. We also release basic X-ray catalog information for BHM targets that were derived from eROSITA X-ray detections – predominantly SPIDERS targets detected in the eFEDS field and/or the first eROSITA hemisphere survey (aka ‘eRASS1’ ). In addition, DR19 incorporates all BHM targeting information that was previously released in DR18, including initial BHM target selection supporting early FPS observations.
The BHM science programs are presented on the BHM programs page (and child pages). The BHM target selection algorithms are described on the BHM target cartons page. The SDSS-V catalog/target database ecosystem is described on the Targeting page. Methods to access the targeting catalogs are described on the Data Access page.