_satellite.jpg) Explorer 25 (Injun 4) satellite | |
| Names | Injun 4 IE-B Ionospheric Explorer-B Explorer XXV |
|---|---|
| Mission type | Ionospheric research |
| Operator | NASA |
| COSPAR ID | 1964-076B |
| SATCAT no. | 00932 |
| Mission duration | 20 months (planned) 59 years, 11 months, 23 days (in orbit) |
| Spacecraft properties | |
| Spacecraft | Explorer XXV |
| Spacecraft type | Explorer |
| Bus | Injun |
| Manufacturer | University of Iowa |
| Launch mass | 40 kg (88 lb) |
| Power | Solar cells and rechargeable batteries |
| Start of mission | |
| Launch date | 21 November 1964, 17:09:39 GMT |
| Rocket | Scout X-4 (S-135R) |
| Launch site | Vandenberg, PALC-D |
| Contractor | Vought |
| Entered service | 21 November 1964 |
| End of mission | |
| Last contact | December 1966 |
| Orbital parameters | |
| Reference system | Geocentric orbit[1] |
| Regime | Low Earth orbit |
| Perigee altitude | 522 km (324 mi) |
| Apogee altitude | 2,494 km (1,550 mi) |
| Inclination | 81.40° |
| Period | 116.30 minutes |
| Instruments | |
| Cadmium Sulfide Detectors Geiger–Müller Counter Plastic Scintillator Particle Detectors Solid-State Detector Spherical Retarding Potential Analyzer | |
Explorer program | |
Explorer 25 (or Injun 4), was a NASA magnetically aligned satellite launched simultaneously with Explorer 24 (AD-B) (Air Density experiment) using a Scout X-4 launch vehicle. This was NASA's first dual-satellite launch. The satellite's primary mission was to make measurements of the influx of energetic particles into the atmosphere of Earth and to study atmospheric heating and the increase in scale height which have been correlated with geomagnetic activity. Studies of the natural and artificial trapped Van Allen radiation belts were also conducted. A biaxial fluxgate magnetometer was used to monitor the orientation of the spacecraft with respect to the local magnetic field.[2]
- ^ "Trajectory: Explorer 25 (Injun 4) 1964-076B". NASA. 28 October 2021. Retrieved 8 November 2021.
This article incorporates text from this source, which is in the public domain.
- ^ "Display: Explorer 25 (Injun 4) 1964-076B". NASA. 28 October 2021. Retrieved 8 November 2021. This article incorporates text from this source, which is in the public domain.
