On February 23, 1999, the close conjunction of Venus and Jupiter will take place. What will their total brightness

On February 23, 1999, the close conjunction of Venus and Jupiter will take place. What will their total brightness be equal to if the brightness of these planets individually is -3.8 ^ m and -2.1 ^ m? What luminaries in the sky can be brighter?

The total brightness of two luminaries with stellar magnitudes m1 and m2 is expressed by the formula:
m = −2.5lg (10−0.4m1 + 10−0.4m2).
The total brightness of Venus (–3.8m) and Jupiter (–2.1m), calculated using this formula, is –4.0m. The sun, the moon and Venus itself can be brighter in our sky when they are closer to the Earth.

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