NSS-806 (New Skies Satellite 806), before Intelsat 806, is a communications satellite originally operated by Intelsat. Launched in 1998 it was operated in geostationary orbit at a longitude of 47 degrees west for around 15 years. It is currently located in the orbital position of 47.5 degrees west longitude, was initially operated by Intelsat, orbited at 40.5 degrees west, and was purchased by SES World Skies (a subsidiary of SES).
Satellite NSS-806 is equipped with 28 transponders in C band and 3 in Ku band, making transmissions for the Americas and parts of Europe. In order to receive the signal it requires a monofocal antenna (LNBF antenna in the center), a LNBF for C band (5150 MHz) and a digital receiver compatible with C band. The NSS-806 emits its signal in circular polarization.
Launch The launch of NSS-806 made use of an Atlas II rocket flying from Cape Canaveral Air Force Station, Florida, United States. The launch took place at 00:21 UTC on February 28, 1998, with the spacecraft entering a geosynchronous transfer orbit. NSS-806 subsequently fired its apogee motor to achieve geostationary orbit.
Health and replacement In July 2017, seven years past its 12-year intended design life, NSS-806 lost the use of 12 of its 39 transponders. NSS-806's replacement, SES-14, was scheduled to be launched in first quarter of 2018 on a SpaceX Falcon 9, and SES predicted that the transponder failure would result in a revenue loss of between 7 and 9 million euros. The following month, SES arranged to swap flights so that SES-12 would launch in January 2018 on an Ariane 5, with SES-12, originally scheduled for that flight, now launching on the Falcon 9 later in Q1.
SES-14 was launched from Kourou on 25 January 2018, but was placed in an incorrect orbit due to a launch vehicle anomaly. SES reported that the all-electric SES-14 would take four more weeks than originally planned to reach its operating orbit, but that the satellite was healthy and was expected to meet its designed life time. SES-14's in-service date, originally set for July 2018, was expected to be pushed back until at least August 2018.
Technical details
C-Band slot chartSlotUplink (GHz)Downlink (GHz)Hemi AHemi BBandwidth (MHz) 5'-6' 6.527 3.502 12' 22' 72 3'-4' 6.607 3.582 11' 21' 72 1'-2' 5.888 3.663 10 20 72 1-2 5.968 3.743 11 21 72 3 6.028 3.803 12A 22A 36 4 6.068 3.843 12B 22B 36 5 6.108 3.883 13A 23A 36 6 6.148 3.923 13B 23B 36 7 6.201 3.976 14A 24A 36 9 6.280 4.055 15 25 36 10 6.320 4.095 16 26 36 11 6.360 4.135 17 27 36 12 6.4025 4.1775 18 28 41
Ku-band slot chartSlotUplink (GHz)Downlink (GHz)Spot 1Bandwidth (MHz) 1-2 14.0425 12.7475 261 77 3-4 14.125 11.830 262 72 5-6 14.205 11.910 263 72
References