ISRO is the Indian space agency responsible for planning, organizing, and executing India's space exploration programs, including asteroid exploration missions.

Chandrayaan-1 was India's first lunar exploration mission, launched in 2008. During its mission, it also made a close encounter with the asteroid 4 Vesta, becoming the first Indian spacecraft to encounter an asteroid.

Chandrayaan-1 encountered the asteroid 4 Vesta, which is the second-largest asteroid in the asteroid belt and one of the brightest asteroids visible from Earth.

4 Vesta is a Vesta-type asteroid, which is a rare type of asteroid characterized by its unique composition and surface features.

Chandrayaan-1 made several important scientific discoveries during its encounter with 4 Vesta, including the detection of water ice on the asteroid's surface, the identification of various minerals, and the mapping of its surface features.

Mangalyaan, also known as the Mars Orbiter Mission, was India's first interplanetary mission, launched in 2013. It successfully entered Mars' orbit in 2014, making India the first Asian country to reach Mars.

The Mangalyaan mission had several scientific objectives, including studying the Martian atmosphere and its composition, searching for evidence of past or present life on Mars, and mapping the Martian surface and its geological features.

The Mangalyaan mission made several important scientific discoveries, including the detection of methane in the Martian atmosphere, the discovery of water-bearing minerals on the Martian surface, and the identification of ancient river channels and deltas on Mars.

Astrosat, also known as the Indian Space Observatory, is India's first dedicated space observatory. It was launched in 2015 and is designed to study the universe in X-rays, ultraviolet, and optical wavelengths.

The Astrosat mission has several scientific objectives, including studying black holes and neutron stars, observing active galactic nuclei and quasars, searching for exoplanets and studying their atmospheres, and more.

NISAR, or the NASA-ISRO Synthetic Aperture Radar, is a joint mission between ISRO and NASA to study Earth's ecosystems. It is scheduled to be launched in 2023 and will use radar technology to collect data on Earth's forests, wetlands, and other ecosystems.

The NISAR mission has several scientific objectives, including monitoring deforestation and forest degradation, studying the impact of climate change on ecosystems, mapping the distribution of wetlands and their changes over time, and more.

Indian contributions to asteroid exploration missions benefit the global scientific community by providing valuable data and insights into the composition and evolution of asteroids, helping in understanding the formation and history of our solar system, and contributing to our knowledge of potential asteroid hazards and planetary defense strategies.

India has plans for future asteroid exploration missions, including developing a dedicated asteroid sample return mission, participating in international asteroid exploration missions, and establishing an asteroid mining program.

Indian contributions to asteroid exploration missions contribute to India's overall space program by demonstrating India's growing capabilities in space exploration, helping in developing new technologies and expertise for future space missions, and inspiring young people to pursue careers in science and technology.