PSLV-C1

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

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

{{Infobox spaceflight

| name = PSLV-C1

| image = PSLV.svg

| image_caption = Model of the PSLV rocket

| image_size = 70px

| mission_type = Deployment of one satellite

| operator = ISRO

| COSPAR_ID =

| SATCAT =

| website = [http://www.isro.gov.in/ ISRO website]

| mission_duration = 1090.52 seconds

| spacecraft = Polar Satellite Launch Vehicle

| spacecraft_type = Launch vehicle

| spacecraft_bus =

| manufacturer = ISRO

| launch_mass = {{cvt|294000|kg}}

| payload_mass = {{cvt|1250|kg}}

| dimensions =

| power =

| launch_date = 29 September 1997, 04:47 UTC

| launch_rocket = PSLV

| launch_site = Sriharikota Launching Range

| launch_contractor = ISRO

| orbit_reference = Geocentric orbit

| orbit_regime = Sun-synchronous orbit

| orbit_periapsis =

| orbit_apoapsis =

| orbit_inclination = 98.7°

| apsis = gee

| payload_items = IRS-1D

| insignia =

| insignia_caption =

| insignia_size = 200px

| programme = Polar Satellite Launch Vehicle missions

| previous_mission = PSLV-D3

| next_mission = PSLV-C2

}}

PSLV-C1 was the overall fourth mission of the Polar Satellite Launch Vehicle (PSLV) program by Indian Space Research Organisation (ISRO). The vehicle carried IRS-1D satellite which was deployed in the Sun-synchronous orbit (SSO).{{cite news|title=PSLV-C1|publisher=Indian Space Research Organisation|access-date=24 Jun 2016|url=http://www.isro.gov.in/launcher/pslv-c1}}{{cite news|title=PSLV-C1 brochure|publisher=Indian Space Research Organisation|access-date=24 June 2016|url=http://www.isro.gov.in/sites/default/files/pdf/pslv-brochures/PSLVC1.pdf}}{{cite news|url=http://www.spacelaunchreport.com/pslv.html|archive-url=https://archive.today/20130104225437/http://www.spacelaunchreport.com/pslv.html|url-status=usurped|archive-date=4 January 2013|title=PSLV|publisher=Space Launch Report|access-date=24 June 2016}}{{cite news|title=ISRO Timeline|publisher=Indian Space Research Organisation|access-date=24 June 2016|url=http://www.isro.gov.in/about-isro/isros-timeline-1960s-to-today#39}} This was India's first launch vehicle built without Russian assistance and PSLV's first operational flight placed IRS-1D into a polar orbit. However, it could not place the satellite in the desired circular orbit but in an elliptical orbit due to a leak of helium gas from one of the components. The mission was termed partial failure since the satellite could not be placed at the desired altitude.{{cite news |title=Space|publisher=digitaltoday.in|access-date=24 June 2016|url=http://archives.digitaltoday.in/indiatoday/13101997/space.html}}{{cite news|title=PSLV fail |publisher=spacelaunchreport.com|access-date=24 June 2016|url=http://www.spacelaunchreport.com/slvfail.txt|archive-url=https://archive.today/20120913053550/http://www.spacelaunchreport.com/slvfail.txt|url-status=usurped|archive-date=13 September 2012}}