Please make a donation to support Gunter's Space Page.
Thank you very much for visiting Gunter's Space Page. I hope that this site is useful and informative for you.
If you appreciate the information provided on this site, please consider supporting my work by making a simple and secure donation via PayPal. Please help to run the website and keep everything free of charge. Thank you very much.

NTS 2 (P76-4)

NTS 2 [NRL]

The successful launch of NTS-2 (Navigation Technology Satellite) marked the beginning of a new era in navigation and timekeeping history. NTS-2 was launched on 23 June 1977 as the first NAVSTAR GPS Phase I satellite.

NTS-2 technological features included cesium frequency standards, a nickel-hydrogen battery, three-axis gravity-gradient stabilization with momentum-wheel unloading, control of the spacecraft orbit, laser retroreflectors, solar-cell experiments, radiation dosimeters, and a worldwide network for data acquisition. The satellite experiment has verified Einstein's relativistic clock shift.

Nation: USA
Type / Application: Navigation
Operator: USAF STP (Space Test Program)
Contractors: Naval Research Laboratory (NRL)
Equipment:
Configuration: Gravity Stabilized
Propulsion: Star-26 AKM
Power: 2 deployable solar arrays, batteries
Lifetime:
Mass: 431 kg
Orbit: 19545 km × 20187 km × 63.28
Satellite COSPAR Date LS Launch Vehicle Remarks
NTS 2 (P76-4) (ex Timation 4) 1977-053A 23.06.1977 Va SLC-3W Atlas-F SGS-1
Further NTS missions:
Further STP missions: