BD+20 2457

BD+20 2457 is a 10th-magnitude K-type bright giant star located approximately 4,800 light-years away[1] in the constellation of Leo.

This star contains a very small amount of metals, containing only 10% as enriched with elements heavier than hydrogen and helium as the Sun.

[2] A dynamical analysis reveals that the proposed system is unstable on astronomically short timescales and so the suggested planetary configuration is unlikely to be correct: further data is needed to determine a physically plausible explanation for the radial velocity variations.

The researchers constrain the minimum age and the stars upper mass to ≥8 billion years and ≤1 M☉.

As an alternative it could have formed from debris of the Gaia-Enceladus galaxy as it merged with the Milky Way.