What was the Aryabhata satellite? India's first satellite, explained
By the WhyCosmos team · Last updated:
Aryabhata was India's first satellite. Designed and built by ISRO in Bengaluru under the leadership of U. R. Rao, it was launched on 19 April 1975 by a Soviet Kosmos-3M rocket from Kapustin Yar. The 360 kg spacecraft carried experiments in X-ray astronomy, solar physics and the upper atmosphere, and re-entered Earth's atmosphere on 10 February 1992.
Every Indian space success since, from Chandrayaan-3 to Aditya-L1, traces back to a 360 kg satellite designed and built in Bengaluru in the early 1970s. Aryabhata did not go perfectly: a power failure stopped its experiments within days. What it gave India was more lasting, the experience of building and running a spacecraft. Many families also remember it from the old two-rupee note, which carried its picture from 1976 to 1997.
How to explain it to your child
Explain it to an 8-year-old
Aryabhata was the first satellite India ever made. Indian scientists and engineers built it themselves, and the Soviet Union gave it a ride into space on their rocket, because India did not yet have a rocket big enough. Up in space it went round and round Earth, sending messages back to scientists on the ground.
Explain it to a 13-year-old
Aryabhata was a 360 kg experimental satellite, designed and fabricated entirely in India, that orbited Earth between about 563 and 619 km up, completing a lap roughly every 96 minutes. It carried three experiments: X-ray astronomy, solar physics and aeronomy, the study of the upper atmosphere. A power failure halted the experiments after four days, yet ISRO records that the spacecraft's main systems remained active until March 1981, and its engineers gained hands-on experience in tracking, telemetry and satellite operations.
Key facts
| Significance | India's first satellite |
|---|---|
| Launch date | 19 April 1975 |
| Launch vehicle | Soviet Kosmos-3M rocket |
| Launch site | Kapustin Yar, in the former Soviet Union (now Russia) |
| Built by | ISRO, in Bengaluru; project led by U. R. Rao |
| Mass and power | About 360 kg; 46 watts from solar cells |
| Orbit | About 563 to 619 km above Earth, roughly 96 minutes per lap |
| Experiments | X-ray astronomy, solar physics and aeronomy (upper atmosphere) |
| Re-entry | 10 February 1992 |
| Named after | Aryabhata, the 5th-century Indian mathematician and astronomer |
Why was Aryabhata so important for India?
ISRO was founded in 1969. Just six years later, its engineers had designed and built a complete satellite: structure, power system, electronics, communications and scientific instruments. Aryabhata was the proof that India could do it.
The mission was not only about reaching orbit. It was about learning how to build, test, track and operate a spacecraft, skills every later Indian mission depended on.
What did the Aryabhata satellite study?
X-ray astronomy. Energetic objects in space give off X-rays, but Earth's atmosphere blocks most of them, so they can only be studied from above it.
Solar physics. Experiments looked at radiation from the Sun, which drives the space environment around Earth.
Aeronomy. The study of the physical and chemical processes in the upper atmosphere, a region too high for balloons and too low for most satellites to stay in for long.
Why was Aryabhata launched on a Soviet rocket?
India did not yet have a rocket that could reach orbit, so under an agreement with the Soviet Union, Aryabhata was launched on a Kosmos-3M rocket from Kapustin Yar, near Volgograd. The satellite was Indian; the ride was borrowed.
India's own launcher came five years later: on 18 July 1980, the SLV-3 rocket lifted off from Sriharikota and placed the Rohini satellite in orbit, the first Indian satellite launched on an Indian rocket.
What went wrong after launch?
A power failure halted Aryabhata's experiments after about four days and 60 orbits, well short of its planned six-month mission. Even so, ISRO records that the spacecraft's main systems remained active until March 1981, and it stayed in orbit for nearly 17 years before re-entering Earth's atmosphere on 10 February 1992.
For a first attempt, that was a valuable outcome. The problems taught engineers as much as the successes did.
How did Aryabhata shape India's space journey?
After Aryabhata came Bhaskara-I, an Earth-observation satellite, in 1979, and then decades of increasingly capable satellites for communication, weather, navigation and science, leading eventually to Chandrayaan-3 on the Moon and Aditya-L1 studying the Sun. India marked the 50th anniversary of Aryabhata's launch on 19 April 2025.
The satellite's name honours Aryabhata, born in 476 CE, whose book, the Aryabhatiya, explained eclipses as shadows, suggested that Earth spins on its axis, and gave a value of pi accurate to four decimal places.
One of our instructors, Ankita Gupta, spent more than eight years as an ISRO scientist developing communication systems for Indian spacecraft, the same kind of system Aryabhata's engineers were learning to build in 1975. For students aged 17 and over, Satellite 101 works through the subsystems every satellite needs: orbits, power, communication with ground stations and thermal control.
Questions parents and kids ask
Aryabhata was India's first satellite, designed and built by ISRO and launched into Earth orbit on 19 April 1975. It carried experiments in X-ray astronomy, solar physics and the upper atmosphere.
On 19 April 1975, from Kapustin Yar in the former Soviet Union, on a Soviet Kosmos-3M rocket.
ISRO engineers and scientists in Bengaluru, in a project led by U. R. Rao, who later became chairman of ISRO.
No. Aryabhata re-entered Earth's atmosphere on 10 February 1992, after nearly 17 years in orbit.
It is named after Aryabhata, the 5th-century Indian mathematician and astronomer who explained eclipses as shadows and suggested that Earth spins on its axis.
Yes. An image of the Aryabhata satellite appeared on the back of Indian two-rupee banknotes from 1976 to 1997.
On 18 July 1980, when the SLV-3 rocket launched the Rohini satellite from Sriharikota.
Your child asks questions like this every week.WhyCosmos runs live online astronomy classes for ages 8–16, taught by real astrophysicists — where questions like these are the curriculum.
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