Telkom-3S

{{Short description|Indonesian communications satellite}}

{{Use British English|date=April 2021}}

{{Use dmy dates|date=February 2017}}

{{Infobox spaceflight

| name = Telkom-3S

| names_list =

| image =

| image_caption =

| image_size = 300px

| mission_type = Communications

| operator = Telkom Indonesia

| COSPAR_ID = 2017-007A

| SATCAT = 41944

| website = https://www.telkom.co.id/sites

| mission_duration = 16 years (planned)
{{time interval|14 February 2017|show=ymd}} (in progress)

| spacecraft = Telkom-3S

| spacecraft_type = Spacebus

| spacecraft_bus = Spacebus-4000B2

| manufacturer = Thales Alenia Space

| launch_mass = {{cvt|3550|kg}}

| dry_mass =

| dimensions = 1.8 m x 2.95 m x 2.86 m

| power = 6.4 kW

| launch_date = 14 February 2017, 21:39 UTC

| launch_rocket = Ariane 5ECA (VA235)

| launch_site = Centre Spatial Guyanais,
Kourou, ELA-3

| launch_contractor = Arianespace

| entered_service = 17 April 2017

| disposal_type =

| deactivated =

| last_contact =

| orbit_reference = Geocentric orbit{{cite web|url=http://www.n2yo.com/satellite/?s=41944|title=TELKOM 3S|publisher=N2YO.com|access-date=29 April 2021}}

| orbit_regime = Geostationary orbit

| orbit_longitude = 118° East

| apsis = gee

| trans_band = 42 transponders:
24 C-Band
8 Extended C-Band
10 Ku-Band

| trans_frequency =

| trans_bandwidth =

| trans_capacity =

| trans_coverage = Indonesia, Southeast Asia, Malaysia

| programme = Palapa constellation

| previous_mission = Telkom-3

| next_mission = Telkom-4

}}

Telkom-3S is an Indonesian geostationary communications satellite built as a replacement of Telkom-3 that was lost due to a launch failure on 6 August 2012.{{cite web |url=http://space.skyrocket.de/doc_sdat/telkom-3s.htm|title=Telkom-3S|publisher=Gunter's Space Page|date=22 June 2018|access-date=29 April 2021}} Telkom-3S was successfully launched on 14 February 2017, at 21:39 UTC{{cite web|title=Arianespace orbits two digital HDTV satellites, SKY Brasil-1 and Telkom-3S, on Ariane 5's 77th successful launch in a row |url=http://www.arianespace.com/press-release/arianespace-orbits-two-digital-hdtv-satellites-sky-brasil-1-and-telkom-3s-on-ariane-5s-77th-successful-launch-in-a-row/|publisher=Arianespace|date=14 February 2017 |access-date=29 April 2021}} and commissioned into service on 17 April 2017.{{cite web|last1=Wijaya|first1=Yulius|title=Peresmian Pengoperasian Satelit Telkom-3S |url=http://www.antaranews.com/foto/107553/peresmian-pengoperasian-satelit-telkom-3s|website=antaranews.com|publisher=Antara News.com|language=id|date=17 April 2017|access-date=29 April 2021}}