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As the comet orbits around the Sun, I gather that its tail loses mass due to solar wind and tidal waves. Approximately, from what distance (with respect to Sun) will the mass loss begin?

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The mass loss begins at approximately 450-600 million kilometers from the sun. This begins roughly in an area between the end of the asteroid belt and 1 AU from Jupiters orbit.

Extract from wikipedia:

The coma is generally made of H 2O and dust, with water making up to 90% of the volatiles that outflow from the nucleus when the comet is within 3 to 4 astronomical units (450,000,000 to 600,000,000 km; 280,000,000 to 370,000,000 mi) of the Sun. Source

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