TIROS-M

{{Short description|Deactivated weather satellite}}

{{Use mdy dates|date=October 2018}}

{{Infobox spaceflight

| name = TIROS-M

| image = ITOS (Tiros-M)-repair.jpg

| image_caption = TIROS-M

| mission_type = Weather

| operator = ESSA{{\}}NASA

| website =

| COSPAR_ID = 1970-008A{{cite web|title=NASA/NSSDC TIROS-M spacecraft details|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1974-089A|access-date=January 6, 2018}}

| SATCAT = 4320

| mission_duration =

| spacecraft_bus =

| manufacturer = RCA Astro

| dry_mass =

| launch_mass = {{convert|309|kg|lb}}

| launch_date = {{start date text|January 23, 1970, 11:31|timezone=yes}} UTC{{cite web|url=http://planet4589.org/space/log/launchlog.txt|title=Launch Log|first=Jonathan|last=McDowell|work=Jonathan's Space Page|access-date=June 6, 2018}}

| launch_rocket = Delta-N6

| launch_site = Vandenberg SLC-2W

| launch_contractor =

| entered_service =

| disposal_type = Decommissioned

| deactivated = {{end date text|June 18, 1971}}

| decay_date =

| orbit_epoch = January 23, 1971

| orbit_reference = Geocentric

| orbit_regime = Low Earth
{{small|Sun-synchronous}}

| orbit_periapsis = {{convert|1432|km|mi|sp=us}}

| orbit_apoapsis = {{convert|1478|km|mi|sp=us}}

| orbit_inclination = 101.99 degrees

| orbit_period = 115 minutes

| orbit_repeat =

| apsis = gee

| programme = ITOS

| previous_mission = ESSA-9
{{small|TOS}}

| next_mission = NOAA-1

}}

TIROS-M, also known as ITOS-1 was a weather satellite operated by the Environmental Science Services Administration (ESSA). It was part of a series of satellites called ITOS, or improved TIROS.{{cite encyclopedia|last=Wade|first=Mark|title=ITOS|encyclopedia=Encyclopedia Astronautica|url=http://www.astronautix.com/craft/itos.htm|archive-url=https://web.archive.org/web/20020621225655/http://www.astronautix.com/craft/itos.htm|url-status=dead|archive-date=June 21, 2002|access-date=June 6, 2018}}{{Cite web |title=WMO OSCAR {{!}} Satellite: ITOS-1 (TIROS-M) |url=https://space.oscar.wmo.int/satellites/view/itos_1_tiros_m |access-date=2024-03-20 |website=space.oscar.wmo.int}} TIROS-M was launched on a Delta rocket on January 23, 1970. The launch carried one other satellite, Australis-OSCAR 5. It was deactivated on June 18, 1971.

File:Graphic of TIROS M, also known as ITOS-1.jpg|TIROS M diagram

File:TIROS M model Spac0067-repair.jpg|TIROS M mechanical and thermal test model

File:Ella1970satimage.png|Image of Hurricane Ella prior to its landfall in northeast Mexico from September 11, 1970, taken by ITOS-1

File:Southern Hemisphere Sea Surface Temperatures, 1970 (50700829562).jpg|Sea-surface temperature map of the Southern Hemisphere created from ITOS data from September 6–8, 1970