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We report the atmospheric turbulence parameters namely, atmospheric seeing,the tilt-anisoplanatic angle ($\theta_0$) and the coherence time ($\tau_0$),measured under various sky conditions, at Vainu Bappu Observatory in Kavalur.Bursts of short exposure images of selected stars were recorded with ahigh-speed, frame-transfer CCD mounted on the Cassegrain focus of a newlycommissioned 1.3 m telescope. The estimated median seeing is $ \approx1.85^{\prime\prime} $ at wavelength of $\sim 600$ nm, the image motioncorrelation between different pairs of stars is $\sim 44\%$ for $\theta_0\approx 36^{\prime\prime}$ and mean $\tau_0$ is $\approx 2.4$ ms. This work wasmotivated by the design considerations and expected the performance of anadaptive optics system that is currently being planned for the telescope.

Measurements of atmospheric turbulence parameters at Vainu Bappu Observatory using short-exposure CCD images