Which star represents Brazil's Federal District on the national flag?

Sigma Octantis represents Brazil’s Federal District on the national flag.

Brazil’s flag depicts a celestial globe with stars corresponding to the country’s states and Federal District. Sigma Octantis, also called Polaris Australis or the Southern Pole Star, is the small star near the south celestial pole and represents the Federal District.

The symbolism reflects the Federal District’s political role and the star’s distinctive position in the southern sky. Brazil’s original Federal District was established in 1889 around Rio de Janeiro, then the national capital. When Brasília became the capital in 1960, the Federal District moved to its present territory, but it continued to be represented by Sigma Octantis.

The other choices identify different Brazilian flag stars. Canopus represents Goiás, Sirius represents Mato Grosso, and Spica represents Pará—the only star positioned above the white band. Sigma Octantis is notably faint, so it is easy to overlook despite its constitutional importance.