Tianhui 2 [CAST]
Official name TIANHUI 2-02B
Alternative name Tianhui 2-02B
Cospar ID 2021-074B
Norad ID 49072
Launch date 2021-08-18
Launch site TSC
Launch vehicle CZ-4B
Country/Organization China
Type application Earth observation (SAR)
RCS size LARGE
Decay date ON ORBIT
Period (min) 94.94
Inclination (deg) 97.47
Perigee (km) 515
Apogee (km) 517
Eccentricity 0.00193798449612403
Mean motion (revs. per day) 15.1674741942279
Semi-Major axis (km) 6894.135
Raan (deg) 134.4987
Arg of perigee (deg) 96.4164
Shape Box + 2 Pan
Mass (kg) 1000
Height (m) 1
Width (m) 1
Depth (m) 1
Span (m^2) 3
Power solar arrays, batteries

TH 2 (Tianhui-2 = "Sky drawing") is a Chinese series of earth observation satellites. The TH-2 satellite system is China?s first microwave surveying satellite system based on interferometric synthetic aperture radartechnology, and is also China?s first close range formation satellite system.

The system works in the X-band, with the resolution of 3 m and a solar synchronous orbit of 500 km. It is composed of two identical satellites. It adopts a technical system of satellite formation in differen torbits and a bistatic radar transceiver mode. It can measure the global digital surface models and acquire radar orthophotos in a short time.

The first group of two satellites was launched on 29 April 2019 on a CZ-4B rocket from Taiyuan. A second group was launched on 18 August 2021.

Satellite COSPAR Date LS Launch Vehicle Remarks
TIANHUI 2-01A 2019-024A 2019-04-29 TSC CZ-4B with Tianhui 2-01B
TIANHUI 2-01B 2019-024C 2019-04-29 TSC CZ-4B with Tianhui 2-01A
TIANHUI 2-02A 2021-074A 2021-08-18 TSC CZ-4B with Tianhui 2-02B
TIANHUI 2-02B 2021-074B 2021-08-18 TSC CZ-4B with Tianhui 2-02A