Kosmos 1409

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

{{Use dmy dates|date=November 2021}}

{{Infobox spaceflight

| name = Kosmos 1409

| names_list = Космос 1409

| image =

| image_caption =

| image_size = 300px

| mission_type = Early warning system

| operator = Russian Strategic Nuclear Forces

| COSPAR_ID = 1982-095A

| SATCAT = 13585

| mission_duration = 4 years (achieved) {{cite journal|url=http://iis-db.stanford.edu/pubs/20734/Podvig-S&GS.pdf|title=History and the Current Status of the Russian Early-Warning System|first=Pavel|last=Podvig|journal=Science and Global Security|volume=10|pages=21–60|issn=0892-9882|doi=10.1080/08929880212328|url-status=dead|archive-url=https://web.archive.org/web/20120315024323/http://iis-db.stanford.edu/pubs/20734/Podvig-S%26GS.pdf|archive-date=2012-03-15|citeseerx=10.1.1.692.6127|date=6 February 2002|issue=1|bibcode=2002S&GS...10...21P|s2cid=122901563|access-date=16 November 2021}}

| spacecraft =

| spacecraft_type = Oko No. 6008

| spacecraft_bus = US-K

| manufacturer =

| launch_mass = {{cvt|2400|kg}}

| dry_mass = {{cvt|1250|kg}}

| dimensions = {{cvt|2|m}} long and {{cvt|1.7|m}} diameter

| power =

| launch_date = 22 September 1982,
06:23:11 UTC{{cite web|url=https://planet4589.org/space/log/launchlog.txt|title=Launch Log|first=Jonathan|last=McDowell|publisher=Jonathan's Space Report|date=21 July 2021|access-date=16 November 2021}}

| launch_rocket = Molniya-M / Blok 2BL

| launch_site = Plesetsk, Site 16/2

| launch_contractor = TsSKB-Progress

| entered_service = 22 September 1982

| last_contact =

| deactivated = 5 January 1987

| decay_date = 8 June 2009

| orbit_reference = Geocentric orbit{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/displayTrajectory.action?id=1982-095A|title=Trajectory: Kosmos 1409 (1982-095A) |publisher=NASA|date=28 October 2021|access-date=16 November 2021}} {{PD-notice}}

| orbit_regime = Molniya orbit

| orbit_slot = 2

| orbit_periapsis = {{cvt|613|km}}

| orbit_apoapsis = {{cvt|39340|km}}

| orbit_inclination = 62.80°

| orbit_period = 709.00 minutes

| apsis = gee

| instruments = Telescope

| programme = Kosmos Series

| previous_mission = Kosmos 1408

| next_mission = Kosmos 1410

}}

Kosmos 1409 ({{langx|ru|Космос 1409}} meaning Cosmos 1409) was a Soviet US-K missile early warning satellite which was launched in 1982 as part of the Soviet military's Oko programme.{{cite web|url=https://space.skyrocket.de/doc_sdat/us-k.htm|title=US-K (73D6)|publisher=Gunter's Space Page|date=11 December 2017|access-date=16 November 2021}} Kosmos 1409 replaced Kosmos 1217 as part of the Oko constellation of satellites and covered the plane 2 - 317° longitude of ascending node.{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1982-095A|title=Display: Kosmos 1409 (1982-095A)|publisher=NASA|date=28 October 2021|access-date=16 November 2021}} {{PD-notice}}