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TYCHO 4144 329 2

TYCHO 4144 329 2 as part of a double star orbits a solar mass companion. The star itself isn't young any more, at least some hundred million years old. So it should already be finished with its planet forming phase. But is has a dust disk with a planetary system in formation, so to speak a second generation of planets. It is together with BP Piscum the first star with an observed planet formation so late in its age. Why this happened, no one knows. This discovery is considered to be a sensation.

Constellation: Ursa Major
Distance: 200 light-years
Visual magnitude: 10.8

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    TYCHO 4144 329 2
Photo: ESO Online Digitized Sky Survey

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