AEHF 1.jpg
Artist's impression of an AEHF satellite
Mission typeMilitary communications
OperatorUS Air Force
COSPAR ID2012-019A
SATCAT no.38254
Mission duration14 years
Spacecraft properties
ManufacturerLockheed Martin
Launch mass6,168 kilograms (13,598 lb)
Start of mission
Launch date4 May 2012, 18:24 UTC
RocketAtlas V 531 (AV-031)
Launch siteCape Canaveral, SLC-41
Orbital parameters
Reference systemGeocentric
Perigee altitude35,770 kilometers (22,230 mi)
Apogee altitude35,815 kilometers (22,254 mi)
Period23.93 hours

USA-235, also known as Advanced Extremely High Frequency 2 or AEHF-2, is a military communications satellite operated by the United States Air Force. It is the second of six spacecraft to be launched as part of the Advanced Extremely High Frequency program, which replaced the earlier Milstar system.[1]


The USA-235 spacecraft was constructed by Lockheed Martin, and is based on the A2100 satellite bus. The spacecraft has a mass of 6,168 kilograms (13,598 lb) and a design life of 14 years.[2] It will be used to provide super high frequency and extremely high frequency communications for the armed forces of the United States, as well as those of the United Kingdom, the Netherlands, and Canada.[1]


USA-235 was launched by United Launch Alliance, aboard an Atlas V 531 flying from Space Launch Complex 41 at the Cape Canaveral Air Force Station. The launch occurred at 18:24 UTC on 4 May 2012,[3] first placing the spacecraft in a parking orbit of 185 kilometers by 905 kilometers. A second burn placed the satellite into a geosynchronous transfer orbit with a perigee of 225 kilometres (140 mi), an apogee of 50,031 kilometres (31,088 mi), and 20.6° inclination.[4] The satellite was successfully deployed in this orbit 51 minutes after launch.[1]

See also


  1. ^ a b c "Atlas V AEHF-2" (PDF).
  2. ^ Krebs, Gunter. "AEHF 1, 2, 3, 4, 5, 6". Gunter's Space Page. Retrieved 25 March 2021.
  3. ^ "NASA - NSSDCA - Spacecraft - Details". Retrieved 26 March 2021.
  4. ^ "Jonathan's Space Report".