Short answer: Sriharikota’s Satish Dhawan Space Centre (SDSC-SHAR) is India’s established, multi-pad orbital launch hub. Thumba is the historic sounding-rocket site where India’s space programme began. Kulasekarapattinam is a new, complementary spaceport being built mainly for Small Satellite Launch Vehicle (SSLV) missions, sun-synchronous polar orbits and launches by non-government entities. India needs both established capacity and a site whose geography makes certain small-satellite launches more efficient.
India has three launch sites with different jobs
Calling every Indian rocket facility a “spaceport” can hide the most important distinction: the sites do not perform the same kind of launch. Satish Dhawan Space Centre at Sriharikota is the country’s operational orbital complex. It integrates satellites with launch vehicles and sends those vehicles into orbit. Thumba Equatorial Rocket Launching Station (TERLS) is an older, continuing facility for sounding rockets and atmospheric research. Kulasekarapattinam’s SSLV Launch Complex is being developed for a narrower but strategically important role: frequent small-launch missions, particularly to sun-synchronous polar orbit (SSO), including missions from non-government entities.
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The comparison is therefore not “which one is India’s real spaceport?” It is “which site has the range, pads, trajectory and user infrastructure that a particular mission requires?”
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| Site | Primary role | Operational status | Typical mission fit |
|---|---|---|---|
| Sriharikota (SDSC-SHAR) | Full orbital-launch base and satellite/vehicle integration complex | Two operational launch pads; a third pad has been approved | PSLV, GSLV, LVM3 and SSLV missions |
| Thumba (TERLS) | Sounding-rocket launches and the historic starting point of India’s space programme | Established sounding-rocket facility | Atmospheric, ionospheric and technology experiments using sounding rockets |
| Kulasekarapattinam (SSLV Launch Complex) | New launch complex focused on SSLV-class and similar missions | Under construction; government schedules are targets | SSLV missions to SSO and launches by non-government entities |
Why Sriharikota is India’s main orbital spaceport
ISRO calls Satish Dhawan Space Centre at Sriharikota “the Spaceport of India.” The site is on the east coast, about 80 kilometres from Chennai, and lies near the equator. Its coastal position gives launch trajectories an open path over the Bay of Bengal, while its latitude provides some of the rotational advantage that makes eastward orbital launches efficient.
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Sriharikota is not a single launch pad. It is a broad complex with vehicle assembly, propellant and testing infrastructure, tracking and range-safety systems, mission-control facilities and separate launch pads. That integrated arrangement is what allows India to prepare different classes of orbital missions at one location rather than treating each launch as a temporary field operation.
“SHAR is located just above the equator on the Northern latitude bounded by the vast Indian coast line, making it one of the most ideal launch sites in the world today.”
Indian Space Research Organisation, launch-services description
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The two existing pads divide much of the current workload. The First Launch Pad handles PSLV and SSLV missions. The Second Launch Pad handles PSLV, GSLV and LVM3 missions. PSLV can therefore use either pad depending on the campaign, while the larger GSLV and LVM3 vehicles are assigned to the infrastructure built for them at the Second Launch Pad.
ISRO’s published launch-services figures describe the intended performance of these vehicles rather than a guarantee for every mission. The SSLV is listed at about 500 kilograms to a 500-kilometre low Earth orbit (LEO), GSLV at about 2,200 kilograms to geosynchronous transfer orbit (GTO), and LVM3 at more than 4,000 kilograms to GTO. Actual payload depends on orbit, spacecraft design, mission trajectory, safety constraints and other flight-specific conditions.
What the planned third pad changes
The Union government approved a Third Launch Pad in 2025. The Press Information Bureau reported in 2026 that it is targeted for the 2029–30 timeframe. It is intended to provide additional capacity for next-generation launch vehicles and to give the national programme more resilience as launch demand grows. “Approved” and “targeted” do not mean that the pad is already available; construction, qualification and operational-readiness work still determine when it can support flights.
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What Thumba does—and why it is not a second Sriharikota
India’s space programme began at TERLS in Thumba, on the coast near Thiruvananthapuram. Early sounding-rocket work there established the country’s experimental and scientific launch capability. Sounding rockets make short suborbital flights: they carry instruments up through the atmosphere, collect measurements and return without placing a satellite into orbit.
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Thumba continues to launch sounding rockets. That makes it an active research facility, not merely a museum or historical landmark. Its mission profile is different from an orbital spaceport: the vehicles are smaller, flights are shorter, and the payloads are usually scientific or technology experiments rather than operational satellites.
ISRO distinguishes the roles clearly: sounding rockets are launched from TERLS, while satellite and launch-vehicle integration and orbital launches are carried out from SDSC-SHAR. Thumba is therefore the answer to “Is India still launching rockets there?” when the question refers to sounding rockets. It is not the normal answer for a PSLV, GSLV, LVM3 or orbital SSLV mission.
Why orbital launches moved away from Thumba
Vikram Sarabhai Space Centre (VSSC) explains that Thumba’s available space and range-safety limitations led India to establish a second rocket-launching station at Sriharikota. An orbital launcher needs a long, carefully controlled downrange corridor. Stages and debris can travel hundreds or thousands of kilometres, and a launch range must protect populated areas, shipping and aircraft while providing tracking and command-destruct coverage.
As launch vehicles became larger and missions more ambitious, the urban and coastal setting around Thumba could not offer the same safety margins and room for expansion. Sriharikota’s geography allowed a purpose-built range with separated launch pads, larger assembly areas and an unobstructed path over the sea. The move was thus an engineering and public-safety decision, not a judgment that Thumba had stopped being useful.
Why India needs Kulasekarapattinam when Sriharikota already exists
Kulasekarapattinam addresses a specific trajectory problem rather than replacing Sriharikota. The Government of India says that an SSLV launched toward a sun-synchronous polar orbit from Sriharikota must manoeuvre to avoid spent stages and other hardware falling over landmasses. Those avoidance manoeuvres consume performance and can reduce the payload that the rocket can deliver.
Kulasekarapattinam’s coastal geometry is intended to provide a more direct route for this class of polar mission. A more direct azimuth can reduce the amount of steering needed after liftoff, allowing a greater share of the vehicle’s performance to be used for the spacecraft. The benefit is mission-specific: it matters most for SSLV-sized payloads headed to SSO or related polar orbits, not automatically for every vehicle or destination.
Why sun-synchronous orbit matters
An SSO passes over areas of Earth at nearly the same local solar time on each visit. That consistent lighting is valuable for Earth-imaging, mapping, environmental monitoring and some reconnaissance applications. Small satellites commonly use SSO, so a launch site optimized for that trajectory can serve a growing market of compact spacecraft.
From Sriharikota, a launcher can still reach SSO. The issue is the route and the safety manoeuvres required to keep falling stages away from land. Kulasekarapattinam is designed to make that particular route cleaner, not to make Sriharikota obsolete.
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A second user base: non-government launch providers
The new complex is also intended for launches by non-government entities. Separating SSLV-focused activity from the heavily scheduled national launch range can make it easier to plan commercial and institutional missions, provided the facility, range systems and regulatory approvals are completed. It does not mean every private launch will use Kulasekarapattinam, nor that the site is already accepting routine commercial flights.
Which vehicles launch from which Indian site?
The practical allocation is easiest to see in the table below. “Handles” means the site and pad are designed or assigned for that vehicle class; it does not imply that every vehicle flies on a fixed timetable.
| Vehicle or mission type | Sriharikota | Thumba | Kulasekarapattinam |
|---|---|---|---|
| PSLV orbital missions | First or Second Launch Pad | Not the orbital-launch site | Not the primary role |
| GSLV orbital missions | Second Launch Pad | Not the orbital-launch site | Not the primary role |
| LVM3 orbital missions | Second Launch Pad | Not the orbital-launch site | Not the primary role |
| SSLV orbital missions | First Launch Pad | Not the orbital-launch site | Primary planned role, especially SSO missions |
| Sounding rockets | Not the site’s defining role | Established role | Not the site’s defining role |
This division answers a common shorthand question: PSLV, GSLV and LVM3 are associated with Sriharikota for orbital missions; SSLV can launch from Sriharikota’s First Launch Pad and is the main focus of the developing Kulasekarapattinam complex; sounding rockets are associated with Thumba.
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How geography changes a launch
Launch-site location affects more than the distance to a nearby city. Four factors matter in combination:
- Latitude: Earth’s rotation provides the greatest eastward boost near the equator. Sriharikota is just north of the equator, which helps eastward launches.
- Azimuth: The direction a rocket flies determines which orbital planes it can reach without a costly change of direction.
- Downrange safety: Spent stages and debris need an unpopulated corridor, with tracking and range-control authority along the route.
- Available land: Large vehicles require assembly buildings, propellant systems, flame trenches, exclusion zones and room for future pads.
These factors explain why a site can be excellent for one orbit and inconvenient for another. Sriharikota’s east-coast position is broadly useful for India’s orbital programme, while Kulasekarapattinam is being shaped around the geometry of small polar launches. Thumba’s constrained surroundings are acceptable for sounding rockets but unsuitable as the country’s main heavy orbital range.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Construction and commissioning status of Kulasekarapattinam
Kulasekarapattinam is not yet an established operational spaceport. ISRO’s Annual Report 2025–26 targeted completion of the launch complex by the end of 2026. Separately, the Press Information Bureau reported a commissioning target during financial year 2026–27. These are schedule targets, not completed milestones, and construction, testing, safety certification or policy decisions could change the dates.
Until the complex is commissioned and a flight is cleared, Sriharikota remains the dependable orbital launch base for India’s current vehicle fleet. Kulasekarapattinam’s eventual value will be measured by the missions it can support efficiently, not simply by the existence of another launch tower.
How to choose the right site for a mission
Mission planners can reduce the comparison to a sequence of practical questions:
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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →- Is the flight orbital? If it is a sounding-rocket experiment, TERLS is the relevant Indian facility. If it must place a spacecraft into orbit, evaluate the orbital ranges.
- Which launcher is being used? PSLV, GSLV and LVM3 missions are planned around Sriharikota’s existing pads. SSLV missions can use the First Launch Pad at Sriharikota and are the main reason for the new Kulasekarapattinam complex.
- What orbit and inclination are required? SSO and other polar missions may benefit from Kulasekarapattinam’s intended direct geometry; other orbits may gain little from moving away from Sriharikota.
- How much payload margin is available? If land-avoidance manoeuvres would reduce the payload on an SSLV mission, the new site may offer a performance advantage once operational.
- Who is the launch customer? National missions use the established institutional range. Non-government entities are specifically included in Kulasekarapattinam’s planned user profile, subject to licensing and range approval.
- Is the required infrastructure ready? A site’s announced purpose is not the same as flight readiness. Confirm pad qualification, tracking, safety approval and an accepted launch campaign before assigning a mission.
Common misconceptions about India’s launch sites
“Kulasekarapattinam will replace Sriharikota.”
No. The planned site is complementary and specialized. Sriharikota remains the broad-spectrum complex for India’s principal orbital vehicles, while Kulasekarapattinam is optimized for SSLV-class and polar missions.
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“Thumba is no longer used.”
Thumba still launches sounding rockets. Its role is scientific and suborbital rather than the integration and orbital-launch role performed at Sriharikota.
“A launch site’s payload rating is fixed.”
Published vehicle figures are reference capabilities for specified destinations. Changing the orbit, inclination, trajectory, spacecraft separation requirements or safety constraints changes the usable payload.
“A new pad immediately increases launch frequency.”
Pad construction is only one part of capacity. Vehicle production, payload readiness, range scheduling, tracking assets, safety reviews and weather all affect the number of missions that can actually fly.
What the comparison means for India’s launch strategy
India is building a layered launch system rather than a collection of interchangeable sites. Thumba preserves the country’s sounding-rocket and atmospheric-research capability. Sriharikota provides mature, multi-vehicle orbital operations today. Kulasekarapattinam is intended to add an orbit-specific, SSLV-focused path that can serve small satellites and non-government launch customers with less trajectory compromise.
The result is specialization: use the established range when a mission needs the existing heavy-lift and medium-lift infrastructure; use Thumba for sounding-rocket science; and, once commissioned, consider Kulasekarapattinam when an SSLV mission’s polar-orbit geometry and customer requirements make its direct route advantageous.
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