NT28: eROSITA-DE DR1 Preliminary

This note reports the first COCM use of the eROSITA-DE Data Release 1 (DR1) archive, implementing Route 3 of the three-route eccentricity unification of NT25: , where is the sector invariant. The full analysis requires the DR1 cluster catalogue (erass1cl_main_v3.2.fits, 12,247 clusters, Bulbul et al. 2024). As preliminary result, manual extraction from the eRODat portal yields 9 official DR1 sources: the Virgo Cluster and 8 extended sources in the Abell 3558 field. These confirm DR1 catalogue quality but are insufficient to measure — the field diameter (3.6 Mpc) is 0.17% of Mpc. Claim 7 () remains Ab (Abierto). Protocol fully defined; companion Python script provided.