China–Brazil Earth Resources Satellite 1 (CBERS-1), also known as Ziyuan I-01 or Ziyuan 1A, is a remote sensing satellite that was operated as part of the China–Brazil Earth Resources Satellite programme between the China National Space Administration and Brazil's National Institute for Space Research.

SACI (Satélite Científico 1) is a 60 kg scientific satellite (Satellite Cientifico). The spacecraft was built by the Brazilian space agency (INPE) and placed into a 732 × 747 km sun-synchronous orbit together with the joint Chinese and Brazilian remote sensing satellite CBERS 1 as primary payload.

The satellite carries four scientific payloads in order to investigate plasma bubbles in the geomagnetic field, air glow, and anomalous cosmic radiation fluxes. It also carries various platform technology developments. The spacecraft has four deployable panels. The ground segment comprises two main stations, and user ground data collecting stations. It is reported that contact with the spacecraft was lost shortly after launch due to either a communications system, antenna, or computer failure.