lens star

By 2006, the source and lens star had moved far enough apart (as viewed from Earth) that their light could be separated.

The lens star is a binary system approximately 10,000 light years away in the constellation Sagittarius.

From these ratios, along with assumptions about the lens star, the mass of the planet and its orbital distance can be estimated.

The lens star is an orange dwarf star of spectral type K, which is accompanied by a giant planet.

Observations by the Hubble Space Telescope revealed that in fact the lens star was actually brighter and less red than expected, matching the expected spectra for a K dwarf of about 0.63 solar masses, more massive than the average star in the galaxy.