Quasar 21 (SDS-4 2, USA 279, NROL-52)

Launch data:

Spacecraft data:

Mission details:

• What is probably the 20th QUASAR data relay and communications satellite for the US National Reconnaissance Office was launched to geostationary transfer orbit on Oct 15, 2017. The satellite was named USA 279 and the launch was code-named NROL-52.

External links:

• Satellite tracking (n2ya.com): Real time satellite tracking