INSAT-2D

{{Short description|Indian geostationary communications satellite}}

{{Infobox spaceflight

| name = INSAT-2D

| image =

| image_caption =

| mission_type = Multipurpose communication

| operator = INSAT

| COSPAR_ID =

| SATCAT =

| website =

| mission_duration = 7 Years

| spacecraft_bus =

| manufacturer = ISRO

| launch_mass = {{convert|2079|kg|abbr=on}}

| dry_mass = {{convert|995|kg|abbr=on}}

| power = 1650 watts

| launch_date = 4 June 1997

| launch_rocket = Ariane-4

| launch_site = French Guiana

| entered_service =

| disposal_type =

| deactivated = 4 Oct, 1997

| orbit_reference = Geocentric

| orbit_regime = Geostationary

| orbit_longitude = 93.5 Degree East

| orbit_slot =

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| apsis =

| trans_band =

| trans_frequency =

| trans_bandwidth =

| trans_capacity =

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| trans_HPBW =

}}

INSAT-2D was an Indian communications satellite. Launched on 4 June 1997, and similar to INSAT-2C, INSAT-2D went out of order on October 4, 1997, because of a power inconsistency problem and was later replaced by INSAT-2DT, an in-orbit satellite which was previously known as ARABSAT-1C. The main aim of the satellite was improved communication.{{Cite web|title=INSAT-2D - ISRO|url=https://www.isro.gov.in/Spacecraft/insat-2d|access-date=2021-06-18|website=www.isro.gov.in|archive-date=2021-06-24|archive-url=https://web.archive.org/web/20210624200518/https://www.isro.gov.in/Spacecraft/insat-2d|url-status=dead}}{{Cite web|title=INSAT-2D|url=https://www.vssc.gov.in/VSSC/index.php/insat-2d|access-date=2021-06-18|website=www.vssc.gov.in|archive-date=2021-06-24|archive-url=https://web.archive.org/web/20210624201825/https://www.vssc.gov.in/VSSC/index.php/insat-2d|url-status=dead}} In the INSAT-2 (Indian National Satellite System) series, INSAT-2D was the fourth consecutive communication satellite. The satellite was launched using an Ariane 4 rocket from French Guiana.

The satellite was placed into geostationary orbit at an inclination of 93.5 degrees east.{{Cite web|title=Welcome To ISRO :: Satellites :: Geo-Stationary Satellite :: INSAT-2D|url=http://resource.itschool.gov.in/physics-web/isro/www.isro.org/satellites/insat-2d.html|access-date=2021-06-18|website=resource.itschool.gov.in}} INSAT-2D's lift-off mass was {{convert|2079|kg|abbr=on}} with propellants of which {{convert|995|kg|abbr=on}} were the dry weight. The satellite was expected to have a nominal lifespan of around 7–9 years.{{Cite web|title=Insat 2C, 2D|url=https://space.skyrocket.de/doc_sdat/insat-2c.htm|access-date=2021-06-18|website=Gunter's Space Page|language=en}} The onboard power of the satellite was estimated to be 1,650 watts.

File:BepiColombo NBO 2020-04-10.webm, satellite can be seen as a bright spot passing by fast. BepiColombo satellite of JAXA can also be seen as a dot moving slowly across the screen.]]

Its communication payload consisted of 16C-band transponders (extended C-band, for fixed-satellite service), two high-power C-band transponders (for broadcasting-satellite service, BSS), one S-band transponder (for BSS), one C/S-band mobile communication transponder, and three K_u-band transponders.