The force of attraction between two objects is calculated through the equation,
F = Gm₁m₂ / d²
where G is universal gravitational constant equal to 6.674 x 10⁻¹¹ Nm²/kg². m₁ and m₂ are masses of the objects, and d is the distance between them. Substituting the known values,
1.79 x 10⁻¹⁴ N = (6.674 x 10⁻¹¹ Nm²/kg²) x (57 kg)(m₂) / (1020 m)²
The value of m₂ from the equation above is equal to
m₂ = 4.895 kg