Satellite Data System (SDS) spacecraft are communication relay satellites for transmitting real-time data from US reconnaissance satellites (e.g. KH-11, Onyx, Topaz) in polar areas. They are also used for communications to USAF aircraft on polar routes and connect the various ground stations of the Air Force Satellite Control Network (AFSCN). The spacecraft relay the downlinked data to a ground station at Fort Belvoir, Virginia.
Elliptical OrbitSoyuz TM-27 was the 35th mission and the 25th long-duration expedition to Mir space station. It was also a part of the US/Russian Shuttle-Mir Program. The mission began on January 29, 1998, 16:33:42 UTC, launching Commander Talgat Musabayev, Flight Engineer Nikolai Budarin and Research Cosmonaut Léopold Eyharts into orbit. They docked with Mir two days later. During their stay there, cosmonauts performed several EVAs and various scientific experiments in medicine, biotechnology, Earth sciences etc. Station crew was visited by several Progress resupply spacecrafts, STS-91, and welcomed aboard Soyuz TM-28 with the next expedition crew. The mission concluded with a safe landing back on Earth on August 25, 1998, 05:24:44 UTC.
Low Earth OrbitIntended for surveillance of Israel's neighbours, the Ofeq series is unusual in having a retrograde orbit. This is due to the geographical location of Israel, which gives only an unobstructed launch path over the mediterranean sea. It is similar to the EROS-A civilian Earth observation satellite. Ofeq 4 (which was possibly the prototype EROS-A satellite) was lost in an launch failure in early 1998.
Low Earth OrbitEarlyBird 1, a remote sensing satellite built by CTA Space Systems (now part of Orbital Sciences Corporation (OSC)) for EarthWatch, Inc., was to provide high resolution commercial imagery. EarthWatch planed to offer black-and-white images with a resolution as high as 3 meters per pixel, and color images with a resolution of 15 meters per pixel. The imaging sensor was derived from NASA's cancelled Clark satellite.
Low Earth OrbitThe Intelsat VIII-VIII/A series has been designed to meet the needs of Intelsat users throughout the system for improved C-band coverage and service. These spacecraft will incorporate six-fold C-band frequency reuse, two-fold frequency reuse of expanded C-band capacity, and the highest C-band power level ever for an Intelsat satellite. Consequently, Intelsat VIII will provide significantly more C-band capacity for public switched telephony and Intelsat Business Service, better quality for video services, and encourage new international VSAT applications.
Geostationary Orbit