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Sriharikota

Sriharikota is a spindle-shaped barrier island located off the Bay of Bengal coast in Tirupati district, Andhra Pradesh, India, spanning approximately 175 square kilometers with a 50-kilometer coastline, and serving as the site of the Satish Dhawan Space Centre (SDSC) SHAR, India's primary spaceport responsible for rocket launches and satellite deployments.^[1]^[2] The island lies in the backwaters of Pulicat Lake, bordered to the west by the Buckingham Canal and to the east by the Bay of Bengal, about 80 kilometers north of Chennai and near the equator, which provides optimal conditions for equatorial launches due to Earth's rotational boost.^[3]^[1] Geographically, Sriharikota features a diverse ecosystem including scrub jungles, eucalyptus and casuarina plantations, medicinal herbs, coconut and palm groves, and cane breaks, supporting migratory birds during the October-to-December season and ongoing forest regeneration efforts for flora and fauna conservation.^[1] The island's sandy terrain includes dunes up to 7 meters thick, with groundwater challenges such as saline aquifers in deeper layers, limiting fresh water to shallow depths.^[4]^[5] Prior to the space program's establishment, the island hosted around 32 villages with nearly 20,000 residents, primarily engaged in agriculture and pisciculture, whose lands were acquired in the 1970s, leading to phased relocations to nearby mainland areas like Nemilimitta Agraharam and Talamanchi, significantly altering local livelihoods.^[6] The Satish Dhawan Space Centre, originally known as the Sriharikota Range (SHAR), was selected in 1969 for its strategic location and established on October 9, 1971, with the inaugural launch of the Rohini-125 sounding rocket, marking the beginning of India's operational space launch infrastructure under the Indian Space Research Organisation (ISRO).^[1]^[3] Renamed in 2002 to honor Professor Satish Dhawan, former ISRO chairman and a pioneer in India's space endeavors, the centre has since become pivotal, hosting facilities such as launch pads, vehicle assembly buildings, and mission control, and enabling key missions including the PSLV and GSLV series, Chandrayaan lunar probes, and the Mars Orbiter Mission. In January 2025, the Indian Cabinet approved the establishment of a Third Launch Pad at SDSC SHAR for next-generation launch vehicles.^[7]^[1]^[3] Today, SDSC SHAR supports both national and international satellite launches for remote sensing, communication, navigation, and scientific purposes, underscoring Sriharikota's transformation into a cornerstone of global space exploration.^[3]^[1]

Geography

Location and Topography

Sriharikota is a spindle-shaped barrier island located off the coast of the Bay of Bengal in Tirupati district, Andhra Pradesh, India, at coordinates 13°43′04″N 80°12′00″E. It spans the Sullurpeta and Tada mandals, serving as a natural divider between the brackish Pulicat Lake to the west and the open waters of the Bay of Bengal to the east. This positioning provides a sheltered lagoon environment on one side while exposing the island to marine influences on the other.^[1]^[8]^[9] The island encompasses an area of 175 square kilometers (43,360 acres) with a coastline stretching 50 kilometers along the Bay of Bengal. Topographically, Sriharikota is low-lying, with an average elevation of about 1 meter above sea level, dominated by sandy terrains, dunes, and sparse vegetation including scrub jungles and plantations. Access from the mainland is facilitated by a 16-kilometer elevated road linking to Sullurpeta town, crossing the shallow waters of Pulicat Lake and ensuring connectivity despite the island's isolation.^[10]^[11]^[1] Geologically, Sriharikota formed as a sandbar through long-term coastal processes, including wave-driven sediment deposition and longshore drift, typical of barrier islands in tropical settings. These dynamics have shaped its elongated form and vulnerability to erosion, while its proximity to the equator—about 13 degrees north—supports efficient orbital insertions for space launches eastward over the ocean.^[11]^[12]

Climate

Sriharikota features a tropical wet and dry climate, classified as Aw (tropical savanna) under the Köppen-Geiger system. This classification reflects a distinct wet season driven by monsoons and a pronounced dry period, akin to the climate in Chennai, approximately 105 km to the south. The region's coastal location moderates extremes, but high humidity persists year-round, contributing to muggy conditions.^[13] Temperatures in Sriharikota vary seasonally, with summer months (March to June) reaching highs of up to 38°C and lows around 26°C, while winter months (December to February) see minimums dropping to about 20°C and highs near 28°C. These ranges align with regional patterns in coastal Andhra Pradesh, where diurnal variations are minimal due to the maritime influence. Annual mean temperatures hover around 29°C, supporting consistent warmth without frost.^[14]^[15] Precipitation totals approximately 1,331 mm annually, with over 70% falling during the two monsoon periods: the southwest monsoon from June to September and the northeast monsoon from October to December. The southwest monsoon brings steady rains influenced by the Bay of Bengal, while the northeast phase often delivers intense, short bursts, occasionally exceeding 200 mm in a single day. Dry months from January to May receive less than 50 mm combined, heightening drought risk in non-monsoonal seasons.^[15]

History

Early Settlement and Selection

Sriharikota, a barrier island off the coast of Andhra Pradesh, featured human settlement prior to 1970, consisting of approximately 32 villages with nearly 20,000 residents, including Yenadi tribal communities and others engaged in agriculture, pisciculture, fishing, hunting, and gathering along the coastal fringes near Pulicat Lake. These Telugu-speaking inhabitants maintained lifestyles reliant on the region's ecotones for sustenance, with historical accounts describing them as dwellers of the wilds around the lake where they fished and foraged. Records of their presence trace back to ancient periods, including references in Tamil Sangam literature around 300 BCE, though detailed documentation remains limited due to the area's isolation and the communities' traditional autonomy from centralized records.^[16]^[6] During the late 1960s, the Indian Space Research Organisation (ISRO), under the guidance of Dr. Vikram Sarabhai, conducted initial surveys to identify a suitable rocket launch site, evaluating multiple coastal locations for safety and operational feasibility. These assessments highlighted Sriharikota's strategic isolation, positioned as a narrow land barrier between the brackish waters of Pulicat Lake to the west and the open expanse of the Bay of Bengal to the east, which minimized risks to nearby populations and provided ample downrange tracking over the sea. The island's terrain, despite its settlements, supported its viability by allowing for relocation and ensuring a clear safety buffer from urban centers.^[1] In 1969, Dr. Sarabhai formally selected Sriharikota as ISRO's primary launch site, citing its proximity to the equator at 13.7° N latitude, which imparts an additional rotational velocity of approximately 450 m/s—equivalent to about 5.8% gain relative to typical low Earth orbit speeds of around 7,800 m/s—for eastward launches, thereby optimizing fuel efficiency. This equatorial advantage, combined with the site's open eastern trajectory over the Bay of Bengal, addressed key requirements for both sounding rockets and orbital missions while adhering to international safety norms. The decision marked a pivotal shift, prioritizing the island's natural seclusion for national space ambitions.^[17] By 1970, the Government of India initiated the acquisition of approximately 37,792 acres of Sriharikota, involving the relocation of nearly 20,000 residents from 32 villages to nearby mainland areas such as Nemilimitta Agraharam and Talamanchi, transforming it from a settled area with tribal foraging grounds into a restricted zone under direct control to facilitate ISRO's development. This transition involved designating the area for exclusive space activities, with access controls enforced to protect operational security and environmental integrity during site preparation. The move ensured the island's dedication to rocketry, laying the groundwork for its evolution into a premier spaceport while preserving its inherent isolation.^[18]^[6]^[19]

Post-Independence Development

The Satish Dhawan Space Centre SHAR became operational on October 9, 1971, marking a pivotal moment in India's space program with the launch of the Rohini-125 sounding rocket from Sriharikota.^[10] This commencement transformed the remote barrier island into a key launch site, supporting subsequent sounding rocket experiments and laying the foundation for larger orbital missions. On September 5, 2002, the facility was renamed the Satish Dhawan Space Centre SHAR in honor of Prof. Satish Dhawan, the third chairman of ISRO, recognizing his contributions to aeronautics and space research.^[10] This renaming underscored the centre's growing role in national space infrastructure. Access to Sriharikota was enhanced in the 1970s through the construction of a causeway linking the island to the mainland at Sullurpeta, approximately 17 km away, facilitating a 20-minute drive and integrating with National Highway 5 (now NH16), the Chennai-Kolkata route.^[20] This infrastructure development enabled efficient logistics for personnel and materials, boosting operational efficiency. The establishment of the space centre shifted the island's economy from traditional fishing and agricultural activities to space-related employment opportunities. ISRO developed a self-sustaining township for staff, featuring housing, schools, and amenities, which supported job creation and community growth for thousands of scientists and technicians.^[10] Key milestones included the first Polar Satellite Launch Vehicle (PSLV) launch on September 20, 1993, deploying the IRS-1E satellite, and the initiation of Geosynchronous Satellite Launch Vehicle (GSLV) developments in the 2000s, with the inaugural flight on April 18, 2001, carrying GSAT-1.^[21]^[22]

Satish Dhawan Space Centre

Establishment and Facilities

The Satish Dhawan Space Centre (SDSC) SHAR was established in 1971 as the Sriharikota Range (SHAR) under the Indian Space Research Organisation's (ISRO) Department of Space, building on the efforts of the Indian National Committee for Space Research (INCOSPAR) in the 1960s to develop indigenous launch capabilities.^[3] This founding was driven by the vision of Dr. Vikram Sarabhai to create a dedicated rocket launching site, with initial operations commencing on October 9, 1971, marked by the launch of the Rohini-125 sounding rocket.^[1] The centre was renamed in 2002 to honor Dr. Satish Dhawan, ISRO's former chairman, while retaining the SHAR acronym.^[23] Spanning 175 square kilometers on Sriharikota Island, the facility includes designated safety zones to ensure secure operations across its uninhabited expanse.^[1] Key infrastructure at SDSC SHAR encompasses specialized launch pads tailored for different vehicles: the First Launch Pad (FLP) supports Geosynchronous Satellite Launch Vehicle (GSLV) and Launch Vehicle Mark-3 (LVM3) missions, while the Second Launch Pad (SLP) is dedicated to Polar Satellite Launch Vehicle (PSLV) integrations.^[3] Vehicle assembly buildings facilitate the mating and integration of launch vehicle stages, complemented by solid propellant processing plants that produce and process propellants for boosters.^[23] Testing facilities include static test stands for solid motors under ambient and simulated high-altitude conditions, alongside range operations for sounding rockets.^[24] Support systems feature telemetry, tracking, and command (TTC) stations for real-time monitoring, as well as a mission control center that coordinates integration with other ISRO facilities.^[3] The centre's development unfolded in phases aligned with India's space program milestones: the initial Rohini Sounding Rocket Complex was set up in 1971 for early suborbital tests, followed by expansions in the 1990s to accommodate PSLV assembly and launches, and more recent upgrades for LVM3 capabilities to handle heavier payloads.^[1] These enhancements have positioned SDSC SHAR as the primary launch base for ISRO's indigenous efforts, closely integrating with centers like the Vikram Sarabhai Space Centre (VSSC) for vehicle design and payload preparation.^[24] The site's equatorial proximity provides rotational velocity benefits for efficient orbit insertions, underscoring its strategic selection in the late 1960s.^[3]

Launch Operations and Achievements

Launch operations at Sriharikota commenced with the successful flight of the Rohini-125 sounding rocket on October 9, 1971, establishing the site as India's primary spaceport for testing and deploying launch vehicles.^[25] This two-stage solid-propellant rocket reached an apogee of about 11 km, enabling initial atmospheric and upper-air research.^[26] Key launch vehicles developed and operated from Sriharikota include the Polar Satellite Launch Vehicle (PSLV), which had its maiden flight on September 20, 1993, and has achieved 58 successful missions as of May 2025, establishing it as a reliable workhorse for placing satellites into sun-synchronous polar orbits.^[27] The Geosynchronous Satellite Launch Vehicle (GSLV) followed with its first launch on April 18, 2001, carrying the GSAT-1 satellite into a sub-optimal geostationary transfer orbit, paving the way for heavier geostationary payloads.^[28] The Launch Vehicle Mark-3 (LVM3), formerly GSLV Mk III, had its first developmental flight on December 18, 2014, successfully placing the CARE re-entry experiment into sub-orbit, with its maiden operational mission on June 5, 2017, deploying the GSAT-19 communications satellite; it has since supported missions requiring up to 4-tonne class payloads to geostationary transfer orbit.^[29] These operations have significantly contributed to India's satellite constellations, including the INSAT series for telecommunications and broadcasting, which enhance nationwide connectivity and disaster management, and the Indian Remote Sensing (IRS) series for earth observation in agriculture, forestry, and urban planning.^[25] Sriharikota launches have also enabled interplanetary missions, such as Chandrayaan-1 in 2008 via PSLV-C11, which discovered water molecules on the Moon, and Mangalyaan (Mars Orbiter Mission) in 2013 via PSLV-C25, achieving Mars orbit on a cost-effective budget.^[30] Additionally, the site has supported navigation satellites under the NavIC system, bolstering regional positioning services. Sriharikota's location at 13.7° N latitude offers an equatorial advantage, imparting a rotational velocity boost of approximately 465 m/s to eastward launches, which optimizes fuel efficiency for geostationary and polar orbits.^[18] Safety protocols emphasize over-ocean trajectories into the Bay of Bengal, directing any potential debris away from populated areas across the uninhabited barrier island and surrounding coastal zones.^[31] A recent milestone occurred on November 2, 2025, when the LVM3-M5 vehicle successfully launched the 4,400 kg CMS-03 communications satellite—India's heaviest to date launched from its soil—into geostationary transfer orbit, enhancing secure military telecommunications for naval and air defense operations.^[32]^[33] This mission, the fifth operational flight of LVM3, underscores the site's growing capability for heavy-lift operations.

Ecology and Biodiversity

Flora

Sriharikota's flora is characterized by a mix of native coastal vegetation and introduced plantations, shaped by its barrier island position along the Bay of Bengal. The dominant vegetation includes scrub jungles comprising thorny bushes and low trees adapted to sandy soils, alongside extensive eucalyptus (Eucalyptus spp.) and casuarina (Casuarina equisetifolia) plantations established for soil stabilization and windbreaks. Coconut (Cocos nucifera) and palm groves are prevalent near coastal areas, while cane breaks of Calamus rotang occur in forested patches, contributing to the island's tropical dry evergreen forest ecosystem.^[1]^[34] Sacred groves on the island harbor a diverse array of native plant species, with over 300 medicinal plants documented among the Yanadi tribal communities. Key native species include Butea monosperma (flame of the forest), a deciduous tree with vibrant orange flowers blooming in February; Memecylon umbellatum, an evergreen shrub with elliptic leaves and purple flowers; and Ochna obtusata, a shrub featuring yellow flowers and persistent red sepals. Other notable plants in these groves encompass Albizia amara, Lannea coromandelica, Azadirachta indica (neem), and Aegle marmelos (bael), many of which hold ethnobotanical significance for treating ailments like arthritis, skin conditions, and diabetes.^[35]^[36]^[37] The island's coastal ecosystems feature salt-tolerant flora well-adapted to the brackish conditions near Pulicat Lake, including halophytes on sand dunes and wetlands. Species such as Avicennia marina (mangrove), Cressa cretica, Atriplex repens, and Aleuropus lagopoides thrive in saline marshes, stabilizing dunes with deep root systems and tolerating high salinity levels that fluctuate seasonally. These plants form dense thickets that protect against erosion in the dynamic coastal environment.^[38] Since the 1970s, the Indian Space Research Organisation (ISRO) has undertaken afforestation initiatives at the Satish Dhawan Space Centre to regenerate forests while accommodating launch infrastructure development. These efforts have involved extensive planting, primarily eucalyptus and casuarina for initial stabilization, resulting in forests that are now three times denser than pre-establishment levels. Recent plans include phased removal of exotic eucalyptus to promote native species regeneration, balancing ecological restoration with operational needs.^[39]^[40]

Fauna and Conservation

Sriharikota supports a diverse vertebrate fauna, with surveys documenting 26 species of mammals, many of which are common across southern India but include some rare or threatened forms. Notable among these are the rusty-spotted cat (Prionailurus rubiginosus), a vulnerable small felid considered one of the world's smallest wild cats, and the jungle cat (Felis chaus), which inhabits scrub and wetland edges. The black-naped hare (Lepus nigricollis) is widespread in open grasslands, while otters, likely the smooth-coated otter (Lutrogale perspicillata), occur near the adjacent Pulicat Lake, utilizing the island's fringes for foraging.^[34]^[41]^[42] Avian diversity is particularly rich, with 215 species recorded, encompassing residents, migrants, and wetland specialists. The island hosts significant populations of migratory waterbirds, including colonial nesters in three heronries: Beripeta, Madugu, and Karimanal, where species like the painted stork (Mycteria leucocephala), a near-threatened wader, breeds in large numbers—up to 250 nests at Beripeta in 2005–2006. Frugivores such as the red-vented bulbul (Pycnonotus cafer) play key roles in seed dispersal, feeding on fruits from the dry evergreen forest.^[34]^[43]^[44] Reptiles number 29 species, including the newly described yellow-green cat snake (Boiga flaviviridis) and the endangered olive ridley turtle (Lepidochelys olivacea), which nests on the eastern beaches. Amphibians comprise 12 species, adapted to the island's seasonal wetlands, while 53 fish species inhabit the surrounding brackish waters of Pulicat Lake and coastal zones.^[34] Conservation efforts on Sriharikota date to the 1970s, following the Indian Space Research Organisation's (ISRO) establishment of the Satish Dhawan Space Centre, which relocated human settlements and imposed restricted access, transforming the island into a de facto refuge for wildlife, particularly waterbirds displaced from mainland sites. Collaborations between ISRO and the Bombay Natural History Society (BNHS) have conducted faunal surveys since the late 1970s, informing biodiversity management and halting destructive practices like eucalyptus plantations. To mitigate development impacts, ISRO has initiated forest regeneration by planning the removal of exotic eucalyptus to restore native tropical dry evergreen vegetation, preserving habitats amid ongoing space infrastructure expansion. Restricted zones continue to limit human disturbance, balancing conservation with operational needs, though threats from habitat fragmentation and invasive species persist.^[34]^[43]

Administration and Demographics

Governance

Sriharikota is administratively part of Tirupati district in Andhra Pradesh, falling primarily under the Sullurpeta mandal, with parts in Tada mandal, and has the postal index number (PIN) 524124 and vehicle registration code AP-03.^[45]^[46] The island's primary control is vested in the Indian Space Research Organisation (ISRO), operating under the Department of Space, Government of India, which has managed the site since the operational establishment of the Sriharikota Range (now Satish Dhawan Space Centre) in 1971; this designation establishes it as a restricted area critical to national security.^[1]^[3]^[47] Local governance within the Shar Project settlement, the dedicated residential township for ISRO employees and facilities, is handled internally by ISRO administration, while state-level oversight applies to non-space activities, including coastal zone management and regulations enforced by the Andhra Pradesh State Coastal Zone Management Authority.^[3]^[48]^[49] Access to Sriharikota is limited exclusively to authorized personnel, requiring prior permission from ISRO for entry due to security protocols; additionally, environmental clearances for development in biodiversity-sensitive zones are obtained in compliance with the Wildlife (Protection) Act, 1972, through ISRO's internal clearance committee to safeguard ecological integrity.^[50]

Population and Society

Sriharikota's population is concentrated in the ISRO-managed township known as Shar Project, which houses primarily scientists, engineers, technicians, and their families. As per the 2011 Census of India, the township had 6,097 residents, comprising 3,191 males and 2,906 females, with a sex ratio of 911 females per 1,000 males and a literacy rate of 88.5%.^[51] Following the 2011 census, India's decennial census has been delayed nationally, with the next scheduled to begin in 2026 for some states and 2027 for others; projections estimate the township population at approximately 6,568 residents as of 2025.^[52] The overall island population, including peripheral villages, exceeds 20,000, though access to the core township remains limited.^[6] The demographics reflect India's national diversity, drawn from ISRO's pan-Indian recruitment of professionals from various states. The official language is Telugu, as per Andhra Pradesh state norms, but Hindi, English, and Tamil are widely spoken in professional and daily interactions, with English serving as the primary medium for technical communication within ISRO facilities.^[53] Society in the township revolves around ISRO's self-contained infrastructure, providing essential amenities to support a high-skilled workforce. Key facilities include Space Central School, established for the education of employees' children up to Class XII, emphasizing quality academics in a secure environment.^[54] The SDSC SHAR Hospital offers comprehensive medical care, including general surgery and specialized treatments for the community.^[55] Recreational options, such as community centers and sports grounds, foster work-life balance, while periodic launch events provide an economic boost through temporary influxes of visitors and support staff. This setup marks a shift from the island's historical fishing-based livelihoods to a society dominated by technical professionals. Cultural life blends limited preservation of local Telugu traditions in peripheral villages with modern, space-oriented influences in the township. Fishing communities on the island's edges maintain customary practices, though restricted by security zones.^[6] Within the township, education integrates space-themed curricula, inspiring residents—especially youth—with ISRO's missions and fostering a culture of scientific curiosity.^[56]

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Sriharikota Range Pin Code is 524124. Sriharikota Range comes under Nellore district. PIN Code is also known as Zip Code or Postal Code.
[45]
RTO Tirupati (AP03) - Vehicle Registration Details & RTO Codes
Find vehicle registration details by number at RTO Tirupati (AP03), including the owner's name, address, and RTO office information.
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Sriharikota Space Center (SHAR) - Indian Space Facilities
Oct 17, 2023 · The Sriharikota Space Center (SHAR) is under the jurisdiction of the Indian Space Research Organisation (ISRO).<|control11|><|separator|>
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SULLURPET MUNICIPALITY - Sri Potti Sriramulu Nellore District
The annual rainfall is 84 mm, Most of it received during the months of ... Average temperature of January is 24 C , February is 26 C, March is 30 C ...
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Sriharikota lost 100 m of coastline in 4 yrs, Andhra govt approves ...
Sep 11, 2023 · As a mitigation measure, the Andhra Pradesh State Coastal Zone Management Authority has approved construction of groynes at India's spaceport.
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How to visit Space Research Center at Sriharikota? - NativePlanet
Jul 30, 2023 · Sriharikota is a restricted area due to its significance as a space launch center. Visitors are not allowed to enter without obtaining prior ...
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Shar Project Population - Sri Potti Sriramulu Nellore, Andhra Pradesh
The Shar Project village has population of 6097 of which 3191 are males while 2906 are females as per Population Census 2011. In Shar Project village population ...Missing: Sriharikota 2023
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Shar Project Village Population 2025: Census Data and Literacy
In 2025, Shar Project Village current estimated population is projected to be 6.57 k (6,568), indicating a 7.73% increased from Shar Project's population in the ...
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What language does ISRO use for radio communication?
Nov 6, 2013 · Most probably english. For technical communication, Hindi is avoided because it lacks technical words and instead borrows them from Sanskrit ...
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SPACE CENTRAL SCHOOL
The school is meant for imparting quality education primarily to the wards of the employees of SDSC, SHAR. ... Hospital, etc., The institution is a full ...Teaching Staffs · Mandatory Disclosure · Oath for Childrens · Important Contacts
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SDSC SHAR Clinic, Nellore, Andhra Pradesh - Hospital - Medindia
Discover SDSC SHAR Clinic in Nellore. Get complete hospital information, including contact details and location on an interactive map.
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Overview - SPACE CENTRAL SCHOOL
Space Central School is nestled in a sylvan setting in the idyllic island of Sriharikota. The institution boasts of an excellent infrastructure and has highly ...