S. K. Trehan is an Indian astronomer who has made significant contributions to asteroid lightcurve analysis. He has published numerous papers on the subject and has been involved in several international collaborations.

The primary goal of asteroid lightcurve analysis is to determine the asteroid's rotation period. This information can be used to infer the asteroid's shape and density.

The basic principle behind asteroid lightcurve analysis is that the asteroid's brightness varies as it rotates. This is because different parts of the asteroid's surface reflect light differently.

Optical telescopes are typically used for asteroid lightcurve analysis because they can detect the visible light that is reflected by the asteroid's surface.

The typical duration of an asteroid lightcurve observation is a few hours. This is because the asteroid's rotation period is typically on the order of a few hours.

Fourier analysis is the most common method used to analyze asteroid lightcurve data. This is because Fourier analysis can be used to extract the asteroid's rotation period from the lightcurve data.

All of the above are challenges associated with asteroid lightcurve analysis. These challenges can make it difficult to accurately determine the asteroid's rotation period and other properties.

Asteroid lightcurve analysis can be used to determine the asteroid's size, shape, rotation period, surface composition, and distance from Earth. This information can be used to better understand the asteroid's properties and its potential impact on Earth.

The Indian Institute of Astrophysics is known for its contributions to asteroid lightcurve analysis. The institute has a long history of research in this area and has published numerous papers on the subject.

Astrosat is an Indian satellite that was launched in 2015. The satellite is equipped with a variety of instruments that can be used to study asteroids, including a visible light telescope and an infrared telescope.

All of the above are future directions of research in asteroid lightcurve analysis. These areas of research will help us to better understand the properties of asteroids and their potential impact on Earth.

A. S. Sharma is an Indian astronomer who has made significant contributions to the study of asteroid families. He has published numerous papers on the subject and has been involved in several international collaborations.

The Sharma family is an Indian asteroid family that was discovered by A. S. Sharma. The family consists of a group of asteroids that share similar orbital characteristics.

All of the above are challenges associated with the study of asteroid families. These challenges can make it difficult to accurately identify and characterize asteroid families.

The study of asteroid families can be used to understand the formation and evolution of asteroids, identify potential impactors of Earth, and study the composition and structure of asteroids.