Queqiao-2 relay satellite (Chinese: 鹊桥二号中继卫星; pinyin: Quèqiáo èr hào zhōngjì wèixīng; lit.

[11][14] Originally, the idea was to design the relay satellite as an improved version of the Queqiao and launch it together with the Chang'e 7 probe.

[14] Although the first Queqiao can provide the unique function of relaying constant communications to and from the far side of the Moon, aided by Chinese Deep Space Network, its halo orbits around the Earth-Moon L1 and L2 were inherently unstable[17] and requires the satellite to consumes 80 g (2.8 oz) of fuel for a small orbit correction maneuver approximately every 9 days.

Eventually, Queqiao-2 will enter a large elliptical frozen orbit of 200 × 16,000 km with a period of 24 hours, which is inclined at 62.4° to the equator.

[5] The Ka band is used to transmit payload data to the ground stations of the Chinese Academy of Sciences, both from the surface probes on the Moon and from the satellite itself.

With quadrature phase shift keying, encryption with low-density parity check code and a traveling wave tube amplifier with 55 W output power, the data transfer rate is on average 100 Mbit/s.

The position is determined using a combination of the so-called Unified S-Band Technology (USB), where the distance and speed of the satellite are calculated from the Doppler shift of the carrier wave for the telemetry signals, and long-base interferometry, where connected radio telescopes are using the Chinese VLBI network to determine the exact angular position.

In the event of a failure of the S-band system, the telemetry and control signals can also be transmitted via the Ka band, and if the Ka band signals are subject to strong attenuation by the water droplets in the Earth's atmosphere during the hot and wet season, the payload data can also be transmitted via the S-band, but only with a data transfer rate of a maximum of 6 Mbit/s.

[36][33] Both are equipped with a communications payload and first one has a laser passive retroreflector and an in-space router, with another has navigational devices.

It facilitates communication between Earth and lunar probes signaling China's commitment to space exploration and international cooperation.