What is the mass of the Sun?

The solar mass is M_☉ = 1.98892e30 kg (uncertainty ±2e25 kg), based on IAU 2015 nominal values.

Key facts

Frequently asked questions

What is the mass of the Sun in kg?

M_☉ = 1.98892e30 kg, about 333,000 times the mass of the Earth.

Why is the solar mass used as a unit?

In astronomy, stellar and galactic masses are conveniently expressed in solar masses (M_☉).

How is the solar mass measured?

From the Sun's gravitational parameter GM_☉, divided by the gravitational constant G.

Related pages

• Speed of light
• Planck constant
• Reduced Planck constant
• Avogadro constant
• Boltzmann constant
• Molar gas constant
• Elementary charge
• Gravitational constant

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