All of the mentioned institutions, namely IIA, PRL, and ARIES, have made significant contributions to the field of asteroid spectroscopy and compositional analysis in India.

Visible and Infrared Spectroscopy is the primary technique used in asteroid spectroscopy to study the chemical composition and surface properties of asteroids.

Dr. U.C. Joshi is a renowned Indian scientist who has made significant contributions to asteroid spectroscopy and is known for his pioneering work in this field.

Compositional analysis helps scientists understand the chemical composition and mineralogy of asteroids, providing insights into their origin and evolution.

Astrosat, India's first dedicated astronomy satellite, was equipped with an imaging spectrometer called the Ultraviolet Imaging Telescope (UVIT), which was used for asteroid studies.

Studying NEAs is important because they pose a potential threat to Earth, can provide insights into the early history of the solar system, and may contain valuable resources.

The Vainu Bappu Telescope, located at Kavalur, Tamil Nadu, was used to observe the composition of asteroid 433 Eros.

Studying the composition of asteroids helps scientists understand the formation and evolution of the solar system, identify potential resources for future space missions, and assess the risk posed by asteroids to Earth.

Dr. J.N. Goswami led the team that discovered the presence of water on asteroid 25143 Itokawa using data from the Japanese spacecraft Hayabusa.

The discovery of water on asteroids has implications for understanding the presence of water in the early solar system, the possibility of life-sustaining environments on asteroids, and the potential for future space exploration missions.

Dr. R.K. Kochhar is known for his work on the composition of Trojan asteroids, a group of asteroids that share Jupiter's orbit.

Studying the composition of asteroids poses challenges due to the vast distances between Earth and asteroids, the small size of asteroids, and the need for specialized instruments for analysis.

The Physical Research Laboratory (PRL) in Ahmedabad, Gujarat, houses the largest collection of meteorite samples in India.

Studying meteorites is important in asteroid research because they provide direct samples of asteroids, helping scientists understand their composition, structure, and early history.

Dr. A.S. Rajagopal is known for his work on the classification of meteorites, contributing to the understanding of their origin and evolution.