HD 1502

HD 1502 (proper name Citadelle) is an 8th-magnitude K-type subgiant star in the constellation of Pisces, located at a distance of approximately 630 light-years. A super-Jupiter planet, HD 1502 b (proper name Indépendance), is known to orbit the star.

Nomenclature
In 2019, the Republic of Haiti was assigned to giving the HD 1502 system a proper name as part of the IAU100 NameExoWorlds Project, planned to celebrate the hundredth anniversary of the International Astronomical Union (IAU), which grants the right to name an exoplanetary system to every state and territory in the world. Names were submitted and selected within Haiti, which were then presented to the IAU to be officially recognized. On 17 December 2019, the IAU announced that HD 1502 and its planet, b, were named Citadelle and Indépendance, respectively.

Citadelle refers to the Citadelle Laferrière, a fortress located in Milot in northern Haiti, which was built in 1820 and declared a world heritage site in 1982 as part of the National History Park. Indépendance was named after the Haitian Declaration of Independence, in celebration of the country's independence on 1 January 1804.

Stellar characteristics
The star has evolved past the main sequence stage and is now a subgiant with a mass of 1.46, a radius of 4.67 , and a spectral type of K0. The star is slightly richer than the Sun in elements heavier than hydrogen and helium, with a metallicity of 0.09 ± 0.03.

The star has an effective temperature of 4947 K, making it cooler than the Sun (5,772 K). Despite this, its large size makes it roughly 12 times brighter. At around 3.0 billion years old, the star is about two-thirds the age of the Sun (4.6 Gyr). Due to its high mass, however, it is further evolved than the Sun, which will spend a total of 10 billion years as a main sequence star.

Planetary system
In 2011, an exoplanet orbiting HD 1502, designated HD 1502 b, was discovered using the radial-velocity method. HD 1502 b revolves around its host star at a distance of 1.262 AU with a period of little over one year in a near-circular orbit (i.e., with a low eccentricity), similarly to planets in the Solar System. It is a super-Jupiter planet with a minimum mass of 2.75 and a predicted radius of 1.183.