Solar mass parameter

GM_☉ = 1.327 124 400 18 × 10²⁰ m³ s⁻²

Unit: m³ s⁻²
Value: 1.327 124 400 18 × 10²⁰
Exact: yes
Note: Known to ten digits from orbits — which is why celestial mechanics uses GM, never G and M separately.
Symbol: GM_☉
Category: Astronomical
Numeric: 132712440018000000000
Uncertainty: adopted (IAU nominal)

Open on the Constants & Units shelf — the interactive card, the filters, and everything alongside it.

From the Constants database in Notion, last edited 2026-08-15. This page is the row, rendered by the build; nothing on it is written by hand.