A Significant Feature in the General Relativistic Time Evolution of the Redshift of Photons Coming from a Star Orbiting Sgr A*

Understand

The star S0-2, orbiting the Galactic central massive black hole candidate Sgr A*, passed its pericenter in May 2018.

• This event is the first chance to detect the general relativistic (GR) effect of a massive black hole, free from non-gravitational physics.
• The observable GR evidence in the event is the difference between the GR redshift and the Newtonian redshift of photons coming from S0-2.
• Within the present observational precision, the 1st post-Newtonian (1PN) GR evidence is detectable.