  | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pisces[1] |
| Right ascension | 00h 19m 17.0660s[2] |
| Declination | +14° 03′ 17.123″[2] |
| Apparent magnitude (V) | 8.36[3] |
| Characteristics | |
| Evolutionary stage | subgiant[4][2] |
| Spectral type | K0 IV[3][4][5] |
| B−Vcolor index | 0.92[3] |
| Astrometry | |
| Radial velocity (Rv) | −9.98±0.12[2] km/s |
| Proper motion (μ) | RA: +74.472[2]1547mas/yr Dec.: −17.069[2]mas/yr |
| Parallax (π) | 5.2018±0.0341 mas[2] |
| Distance | 627 ± 4 ly (192 ± 1 pc) |
| Absolute magnitude (MV) | +2.39[1] |
| Details | |
| Mass | 1.46±0.15[5] M☉ |
| Radius | 4.67±0.57[5] R☉ |
| Luminosity | 11.75+15.14 −9.12[5] L☉ |
| Surface gravity (log g) | 3.18[5] cgs |
| Temperature | 4947[5] K |
| Metallicity[Fe/H] | 0.09±0.03[3] dex |
| Rotational velocity (v sin i) | 2.70±0.5[3] km/s |
| Age | 3.0+1.2 −0.8[5] Gyr |
| Other designations | |
| BD+13°34,Gaia DR2 2768172019308167296,HD 1502,HIP 1547,SAO 91845,TYC 601-636-1,GSC 00601-00636,2MASS J00191704+1403172[6] | |
| Database references | |
| SIMBAD | data |
HD 1502 (proper nameCitadelle) is an 8th-magnitudeK-typesubgiant star in the constellation ofPisces, located at a distance of approximately 630light-years. Asuper-Jupiter planet, HD 1502 b (proper name Indépendance), is known to orbit the star.
In 2019, theRepublic of Haiti was assigned to giving the HD 1502 system a proper name as part of theIAU100 NameExoWorlds Project, planned to celebrate the hundredth anniversary of theInternational Astronomical Union (IAU), which grants the right to name an exoplanetary system to every state and territory in the world.[7] Names were submitted and selected within Haiti, which were then presented to the IAU to be officially recognized.[8] On 17 December 2019, the IAU announced that HD 1502 and its planet, b, were named Citadelle and Indépendance, respectively.[9]
Citadelle refers to theCitadelle Laferrière, a fortress located inMilot in northern Haiti, which was built in 1820 and declared aWorld Heritage Site in 1982 as part of theNational History Park. Indépendance was named after theHaitian Declaration of Independence, in celebration of thecountry's independence on 1 January 1804.[9]
The star hasevolved past themain sequence stage and is now a subgiant with a mass of 1.46M☉, a radius of 4.67R☉, and a spectral type of K0.[3][4][5] The star is slightly richer than theSun in elements heavier thanhydrogen andhelium, with ametallicity of0.09±0.03.[a][3]
The star has aneffective temperature of 4,947 K (4,674 °C; 8,445 °F),[5] making it cooler than the Sun (5,772 K).[10] Despite this, its large size makes it roughly 12 times brighter.[5] At around 3.0 billion years old,[5] the star is about two-thirds theage of the Sun (4.6Gyr).[11] 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.[12]
In 2011, anexoplanet orbiting HD 1502, designated HD 1502 b, was discovered using theradial-velocity method.[3] HD 1502 b revolves around its host star at a distance of 1.262 AU (188,800,000 km) with a period of little over one year in a near-circular orbit (i.e., with a loweccentricity),[4] similarly to planets in theSolar System.[13] It is a super-Jupiter planet with a minimum mass of 2.75MJ and a predicted radius of 1.183RJ.[4]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b (Indépendance) | ≥2.75±0.16 MJ | 1.262±0.092 | 428.5±1.2 | 0.031±0.022 | — | 1.183 (predicted) RJ |
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