Topaz 5 (FIA-Radar 5, USA 281, NROL 47)

Launch data:

Spacecraft data:

Mission details:

• ULA launched a Delta 4 from Vandenberg on Jan 12, 2018 on behalf of the US National Reconnaissance Office.
  Launch NROL-47 placed the secret USA 281 satellite in a 1050 km retrograde orbit; the satellite is believed to be a TOPAZ radar imaging vehicle. The Delta 4 second stage was deorbited after payload separation and did not get a US catalog number.

External links:

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