Free tools Windows power users keep installed
One-click scans. No signup required.
iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
Short answer: Sriharikota’s Satish Dhawan Space Centre (SDSC-SHAR) is India’s established orbital spaceport, handling PSLV, GSLV, LVM3 and SSLV missions from two operating launch pads. Thumba is a historic sounding-rocket station that remains used for sounding rockets, not a competing orbital base. Kulasekarapattinam is a new, complementary complex being built mainly for SSLV-class missions to sun-synchronous polar orbits and for launches by non-government entities.
The sites exist because a launch site is chosen for more than proximity to a factory. Range safety, available land, the direction a rocket must fly, the orbit a customer needs and the type of vehicle all matter. Those differences explain why India is expanding beyond Sriharikota rather than replacing it.
India’s launch sites at a glance
| Launch site | Main role | Operational status | Vehicles or missions associated with it | Defining consideration |
|---|---|---|---|---|
| Sriharikota (SDSC-SHAR) | Broad-spectrum orbital launch complex and integration base | Two operational pads; a third pad was approved in 2025 | First Launch Pad: PSLV and SSLV. Second Launch Pad: PSLV, GSLV and LVM3 | Large, established range on India’s east coast, about 80 km from Chennai and near the equator |
| Thumba (TERLS) | Sounding-rocket launches and the historic starting point of India’s space programme | Established sounding-rocket facility | Sounding rockets | Limited space and range-safety constraints make it unsuitable for the country’s main orbital-launch role |
| Kulasekarapattinam (SSLV Launch Complex) | Dedicated or primarily dedicated site for SSLV, polar missions and non-government launchers | Under construction; completion and commissioning dates are government targets | SSLV and comparable missions by non-government entities | Designed to improve the flight geometry for sun-synchronous polar orbits and reduce land-avoidance manoeuvres |
Calling all three places “spaceports” can hide an important distinction. Sriharikota is an operational orbital spaceport. Thumba is chiefly a sounding-rocket range. Kulasekarapattinam is an additional orbital launch complex still moving through construction and commissioning.
What makes a launch site a spaceport?
An orbital launch site is an integrated system rather than a concrete pad. It normally includes vehicle assembly and checkout areas, a launch mount, propellant and ground-support systems, tracking and telemetry, flight-safety facilities, roads and protected zones. The site must also have a safe corridor in which spent stages and other hardware can fall without endangering people or property.
#1 Best Overall
A sounding rocket follows a shorter, suborbital flight and returns to Earth without placing a satellite in orbit. An orbital launcher must reach the required speed and then release a payload into a precisely selected trajectory. That demands a much larger safety envelope and more complex coordination with tracking stations and range authorities.
For this reason, a station can be historically important and still have a different job from a modern orbital spaceport. Thumba’s continuing sounding-rocket work does not make it an alternative to Sriharikota for PSLV, GSLV, LVM3 or SSLV orbital missions.
Sriharikota: India’s established orbital hub
Location and geographic advantage
ISRO describes Satish Dhawan Space Centre at Sriharikota as the “Spaceport of India.” The launch complex is on India’s east coast, about 80 km from Chennai, and close to the equator. ISRO says its position just above the equator and beside India’s long coastline makes it one of the world’s most suitable launch locations.
An east-coast site gives a launcher room to head over the sea after liftoff, subject to the approved flight corridor. Being near the equator can also be useful for missions that need an eastward component of velocity, although the benefit depends on the target orbit and the vehicle’s trajectory. Location is therefore an enabler, not a guarantee that every mission will use the same heading or receive the same performance.
Two operating pads with different vehicle assignments
Sriharikota’s First Launch Pad is assigned to PSLV and SSLV missions. Its Second Launch Pad supports PSLV, GSLV and LVM3. PSLV can therefore be handled on either of the listed pads, while the larger GSLV and LVM3 are associated with the Second Launch Pad in the current allocation.
Rank #2
- Book - space atlas, second edition: mapping the universe and beyond
- Language: english
- Binding: hardcover
The separation is practical. Different vehicles require different launch mounts, propellant systems, safety procedures and processing flows. Multiple pads also let teams prepare one mission while another pad is being refurbished or configured for a different vehicle, although no guaranteed launch cadence or fixed turnaround time is stated.
Payload figures that are actually stated
ISRO’s launch-services information lists an intended SSLV capability of 500 kg to a 500 km low Earth orbit. The same information gives GSLV performance of about 2,200 kg to geosynchronous transfer orbit and LVM3 performance of over 4,000 kg to geosynchronous transfer orbit. These are vehicle-level figures for the stated destination or orbit class, not promises that every customer payload will reach those numbers under every mission profile.
Do these 3 things before closing this tab:
1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesNo comparable PSLV capacity figure is stated here, so it is better to identify PSLV by its pad assignment and broad operational role than to attach an unsupported number.
The planned third pad
The Government of India approved a Third Launch Pad in 2025 for next-generation vehicles. A 2026 Press Information Bureau update put the target timeframe at 2029–30. That is a planning target, not a completed facility or a guaranteed opening date. Its purpose is to add future capacity alongside the two existing pads rather than to make Sriharikota obsolete.
Thumba: the historic sounding-rocket station
Why Thumba matters
India’s space programme began at the Thumba Equatorial Rocket Launching Station, commonly abbreviated TERLS. The site’s history is tied to early atmospheric and upper-air experiments using sounding rockets. Those missions helped build expertise in tracking, telemetry, launch operations and scientific payloads before India had today’s orbital launch infrastructure.
Thumba still has a role: ISRO states that sounding rockets are launched there. A sounding mission can carry instruments into the upper atmosphere for a focused experiment without placing a satellite into orbit. That makes the site useful for research and technology work even though it is not the base for India’s principal orbital launch vehicles.
Outdated Drivers Are Slowing You Down
One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchPC Slower Than It Used to Be?
A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Why Thumba did not remain the orbital base
Vikram Sarabhai Space Centre (VSSC) explains that Thumba’s limited space and range-safety constraints led India to establish a second rocket-launching station at Sriharikota. An orbital launcher needs room for assembly and support infrastructure, protected exclusion zones and a flight path that keeps falling hardware away from populated areas. As launch vehicles grew larger and missions became more demanding, those requirements exceeded what the Thumba location could safely provide.
ISRO distinguishes the functions explicitly: sounding rockets are launched from TERLS, while satellite and launch-vehicle integration and orbital launches are carried out from SDSC-SHAR. Thumba is therefore best understood as a continuing specialist facility and a historic origin point, not a smaller version of Sriharikota.
Why India needs Kulasekarapattinam when Sriharikota already works
The problem is orbital geometry, not simply pad capacity
The Government of India identifies a specific limitation for SSLV missions to sun-synchronous polar orbit from Sriharikota. To keep spent stages from falling over landmasses, a rocket may need to manoeuvre away from the most direct trajectory. Those manoeuvres consume performance and can reduce the payload the vehicle carries to orbit.
This is a trajectory-and-safety trade-off. Sriharikota remains fully capable of launching SSLV, but a particular polar mission may not get the same payload potential there as it would from a site with a more favourable launch azimuth. Building another complex can solve that mission-specific constraint without displacing the established fleet at Sriharikota.
Rank #4
What Kulasekarapattinam is intended to do
Kulasekarapattinam is being developed primarily for SSLV missions, especially sun-synchronous polar orbits, and for launches by non-government entities. Its value is concentrated rather than universal: it is intended to provide a more direct and efficient geometry for the missions for which Sriharikota’s land-avoidance manoeuvres are costly.
The complex is not described as a replacement for the First or Second Launch Pad. Nor is it presented as the destination for GSLV or LVM3 missions. Those vehicles remain assigned to Sriharikota’s existing orbital infrastructure in the current plan.
Construction and commissioning targets
Two official documents provide related but different milestones. ISRO’s Annual Report 2025–26 targeted completion of the Kulasekarapattinam complex by the end of 2026. A 2026 Press Information Bureau update targeted commissioning during financial year 2026–27. Completion of construction and commissioning for launch operations are separate steps, and both dates are targets that can move as work progresses.
Until the facility is commissioned and a mission is assigned to it, Sriharikota remains India’s operational orbital hub. The new complex should be treated as an expansion of national launch options, not as an already active alternative.
The Tool Desk
Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Which site launches which vehicle?
| Vehicle or mission type | Site and pad indicated by current assignments | What that means for a reader |
|---|---|---|
| PSLV | Sriharikota First or Second Launch Pad | PSLV is part of Sriharikota’s established orbital launch programme; no single exclusive pad is stated. |
| GSLV | Sriharikota Second Launch Pad | GSLV is handled within the existing orbital complex, with an ISRO-stated figure of about 2,200 kg to geosynchronous transfer orbit. |
| LVM3 | Sriharikota Second Launch Pad | LVM3 is the largest vehicle named in the comparison, with ISRO stating over 4,000 kg to geosynchronous transfer orbit. |
| SSLV | Sriharikota First Launch Pad today; Kulasekarapattinam being developed for SSLV-focused missions | The choice can depend on the target orbit, range-safety geometry and whether the launch is assigned to the new complex. ISRO states an intended 500 kg capability to a 500 km low Earth orbit for SSLV. |
| Sounding rockets | Thumba (TERLS) | These are suborbital research launches, not satellite insertion missions from Sriharikota. |
How sun-synchronous polar missions change the site decision
A sun-synchronous orbit is a type of near-polar orbit selected so that a spacecraft passes over locations at similar local solar times. That lighting consistency is useful for many Earth-observation applications. Reaching it requires a carefully chosen inclination and launch direction, not merely “going south.”
Best Value
From any launch site, mission designers must balance the desired orbital plane against public safety. Stages and fragments follow the trajectory imposed by the vehicle’s guidance and the launch azimuth. If a direct path crosses land, the range may require a turn or another manoeuvre to keep impact zones over safer areas. The Government of India says this is the reason Sriharikota SSLV missions to sun-synchronous polar orbit can lose payload capability.
Kulasekarapattinam is intended to reduce that penalty for the relevant class of mission. The benefit is therefore measured in trajectory efficiency and available payload, not in a blanket claim that every rocket launched there will outperform the same rocket from Sriharikota.
How to choose the right Indian launch site
- Identify whether the mission is orbital. A sounding-rocket experiment belongs to the TERLS role. A satellite mission requires an orbital launch complex.
- Match the vehicle to the available pad. PSLV and SSLV are assigned to Sriharikota’s First Launch Pad; PSLV, GSLV and LVM3 are assigned to the Second Launch Pad.
- Define the target orbit before comparing sites. Low Earth orbit, geosynchronous transfer orbit and sun-synchronous polar orbit impose different trajectory requirements. A site advantage cannot be judged without the orbit.
- Check range-safety geometry. Ask where each stage is expected to fall and whether avoiding land requires a turn or other performance-consuming manoeuvre.
- Check the facility’s status and user eligibility. Sriharikota is operational. Kulasekarapattinam is still subject to construction and commissioning targets and is intended to support non-government entities as well as SSLV-focused missions.
- Confirm the pad and schedule with the launch authority. Pad assignments and opening dates can change as vehicles, safety reviews and construction plans evolve.
Common misconceptions about India’s spaceports
“Thumba and Sriharikota are interchangeable.”
They are not. Thumba’s continuing function is sounding-rocket work, while Sriharikota performs satellite and launch-vehicle integration and orbital launches. The move to Sriharikota was driven by space and range-safety needs.
“Kulasekarapattinam will replace Sriharikota.”
The stated plan is complementary. Sriharikota remains the multi-vehicle orbital hub, with two operating pads and a third approved for future vehicles. Kulasekarapattinam addresses a narrower SSLV and polar-orbit requirement and is being built for additional users, including non-government entities.
“A new launch site automatically means every rocket carries more.”
Payload depends on the vehicle, orbit, trajectory, safety corridor and mission reserves. Kulasekarapattinam’s expected advantage concerns the specific land-avoidance problem identified for SSLV missions to sun-synchronous polar orbit. It should not be generalized to GSLV, LVM3 or every SSLV destination.
“A target date means the site is already available.”
It does not. The end-of-2026 completion target in ISRO’s 2025–26 annual report and the FY 2026–27 commissioning target in the 2026 government update describe planned milestones. Launch availability begins only after construction, testing, safety authorization and commissioning are complete.
What the three-site network means for India’s launch programme
The sites form a division of labour. Thumba preserves a sounding-rocket capability and the location where India’s programme began. Sriharikota supplies the mature infrastructure for the country’s principal orbital vehicles, from PSLV through GSLV and LVM3, while also launching SSLV. Kulasekarapattinam is intended to add a better-tailored option for SSLV-class polar missions and a broader role for non-government launch providers.
Recommended Free Tools
That arrangement improves resilience without pretending that one pad can be optimal for every mission. A launch provider can select the site whose safety corridor, vehicle systems and orbital geometry best fit the payload. For readers comparing the locations, the decisive question is not which site is “best” in the abstract; it is which site is operational for the required date and vehicle, and which one offers the safest and most efficient path to the target orbit.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
