Eleven hundred meter length.
Active gravity generation.
Residual heat. Fast neutron scatter.
Designation code: CORRUPTED
Date of commissioning: Unknown
Origin point: Unknown
Presumed to have collided/merged with one-kilometer comet: assessment based on depth of hydrocarbon crust covering the hull, water content of soil, atmosphere of oxygen and carbon dioxide with isotopic ratios placing the comet in the Oort population.
Low-light foliage grown from terrestrial stocks, mirrors focusing starlight into growth chambers...resident fauna...five insect species, plus rats descended from uncertain ancestors.
Surface heavily wooded until recently, unknown event triggering firestorm...seventy percent of world forest consumed, atmosphere laced with smoke and particulates...free oxygen in short supply.
No distress calls noted. No evidence of crew or passengers on exterior.
Interior scans inconclusive.
Cleared to attempt approach.