We will comment on the perihelion/periastron advance of celestial bodies due to the cosmological constant $\Lambda$. It is well known that the cosmological constant $\Lambda$ causes the perihelion/periastron shift; however, there seems to still exist a discrepancy among the various derived precession formulae. We will point out that the expression $\Delta \omega_{ \Lambda} = (\pi c^2 \Lambda a^3/(GM))\sqrt{ 1 - e^2}$ is the general formula for any orbital eccentricity $e$ and the expression $\Delta \omega_{ \Lambda} = (\pi c^2 \Lambda a^3/(GM))(1 - e^2)^3$ comes from the nearly circular ($e \ll 1$) approximation.
Categories: gr-qc astro-ph.CO