CAS 7 (Chinese Amateur Radio Satellite 7) or BP 1 are two Chinese nanosatellites for amateur radio communication and education.

The Chinese Amateur Satellite Group (CAMSAT) is working on the project with the Beijing Institute of Technology (BIT). The university provides support for the launch of the satellite, with teachers and students from this university participating in the development and testing of the satellite. With the help of CAMSAT, the university has established an amateur radio club for gaining experience with amateur radio satellite communication.

The satellites are based on a 1.5U CubeSat structure but modified with a larger base plate. It will deploy an inflatable balloon, which stays attached to the satellite to provide passive aerodynamic stabilization.

This is an unidentified satellite from Aerospace Science and Technology Space Engineering Development Co. (Hangtian KKG Fazhang).

Reportedly it was an inflatable balloon payload for air density experiments.