Alpha Centauri

Henderson obtained for Alpha Cen the value 1.16 +/- 0.11 arcsec.

He found that his method should have detected Alpha Cen Bb.

The spectacular, zero-magnitude double star Alpha Cen AB, and its faint, red-dwarf tag-along Alpha Cen C (Proxima Centauri) 2[degrees] to one side, are so far south at about declination -61[degrees] that they're forever out of sight north of Miami or thereabouts.

The exoplanet whips around its sun in 3.2 days, hugging it at one-tenth the distance Mercury orbits the Sun--nowhere near Alpha Cen B's habitable zone, which lies where Venus's orbit would be.

The Villanova group speculates that Alpha Cen A is undergoing a decrease in stellar magnetic activity, similar to the Maunder Minimum that the Sun experienced from 1645 to 1715.

Viewed with binoculars, Alpha Centauri can be easily split into two near-equal suns--Alpha Cen A and Alpha Cen B.