Question

What happens if Jupiter is ignited?

Answer 1

Brown dwarfs as light as 13 mass Jupiter can ignite Deuterium fusion. So we seem to have some weak forms of fusion (on low abundance fuels) that can happen for some range of brown dwarf masses. ... No, Jupiter is simply not massive enough to sustain nuclear fusion (and effectively become a star).
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Answer 2

Hi mate

Here is my answer and I hope it helps

First, it wouldn’t really become a star. Despite Jupiter having a really high atmospheric composition of hydrogen and helium, the same as other stars in the Milky Way, it just doesn’t have sufficient mass. The fusion wouldn’t work.

Jupiter would need about 80 times its mass to become a star. And even then, Jupiter is really far. We wouldn’t have very interesting effects. We would receive about 1%-6% more energy, and we’d have a really bright star in the sky (although not as bright as the moon).

Now, things get a lot more fun if Jupiter became a star the size of the sun.

Things get hot. And really messy.

The orbits of all the planets in the solar system change. Jupiter and the Sun attract, and get progressively closer. Everything is sucked in towards them.

And of course, Everyone Dies