GSAT-8

{{Infobox spaceflight

| name = GSAT-8

| image = Gsat8 img.gif

| image_caption = GSAT-8

| mission_type = Communication

| operator = INSAT

| website =

| COSPAR_ID = 2011-022A

| SATCAT =

| mission_duration = Planned: 12 years
Elapsed: {{time interval|20 May 2011|show=ymd|sep=,}}

| spacecraft_bus = I-3K

| manufacturer = ISRO

| dry_mass = {{convert|1426|kg|lb}}{{cite web|title=GSAT-8 Brochure|url=http://www.isro.org:80/pdf/gsat-8-brochure.pdf|archive-url=https://web.archive.org/web/20130311183311/http://www.isro.org/pdf/gsat-8-brochure.pdf|url-status=dead|archive-date=11 March 2013|access-date=30 November 2017}}

| launch_mass = {{convert|3093|kg|lb}}

| power = 6,242 watts

| launch_date = {{start-date|20 May 2011, 20:38|timezone=yes}} UTC

| launch_rocket = Ariane 5ECA VA202

| launch_site = Kourou ELA-3

| launch_contractor = Arianespace

| entered_service =

| disposal_type =

| deactivated =

| orbit_epoch =

| orbit_reference = Geocentric

| orbit_regime = Geostationary

| orbit_periapsis =

| orbit_apoapsis =

| orbit_inclination =

| orbit_period =

| orbit_longitude = 55° East

| orbit_slot =

| apsis = gee

| trans_band = 24 Ku band and 2 in L1 & L5 bands (GAGAN)

| trans_frequency =

| trans_bandwidth =

| trans_capacity =

| trans_coverage =

| trans_TWTA =

| trans_EIRP =

| trans_HPBW =

| programme = GSAT

| previous_mission = GSAT-5P

| next_mission = GSAT-12

}}

GSAT-8 or INSAT-4G is communication satellite. It was constructed by the Indian Space Research Organisation, as part of INSAT system. GSAT-8 was launched on May 21, 2011, from Kourou, French Guiana. The rocket, an Ariane 5 was the carrier, marketed by the European Arianespace. First satellite to carry GAGAN payload followed up by GSAT-10 and in-orbit spare GSAT-15.{{Cite web|url=http://www.isac.gov.in/navigation/gagan.jsp|title=GAGAN - GPS Aided GEO Augumented Navigation|website=www.isac.gov.in|access-date=2017-11-30}}{{Cite web|url=https://www.isac.gov.in/communication/html/gsat-8.jsp|title=SALIENT FEATURES OF GSAT-8|website=www.isac.gov.in|access-date=2018-03-17|archive-date=2018-03-18|archive-url=https://web.archive.org/web/20180318054308/https://www.isac.gov.in/communication/html/gsat-8.jsp|url-status=dead}}