HD 52265
Star in the constellation Monoceros
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HD 52265, also named Citalá, is a star with an orbiting exoplanet companion in the equatorial constellation of Monoceros. It is dimly visible to the naked eye with an apparent visual magnitude of 6.29.[1] The star is located at a distance of 98 light-years based on parallax measurements, and is drifting further away with a heliocentric radial velocity of 54 km/s.[1]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Monoceros[1] |
| Right ascension | 07h 00m 18.036s[2] |
| Declination | −05° 22′ 01.78″[2] |
| Apparent magnitude (V) | 6.29[1] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | G0 V[3] |
| B−V color index | 0.572±0.003[1] |
| Variable type | None[4] |
| Astrometry | |
| Radial velocity (Rv) | 53.86±0.09[1] km/s |
| Proper motion (μ) | RA: −116.513 mas/yr[2] Dec.: 80.633 mas/yr[2] |
| Parallax (π) | 33.425±0.0223 mas[2] |
| Distance | 97.58 ± 0.07 ly (29.92 ± 0.02 pc) |
| Absolute magnitude (MV) | 3.98[1] |
| Details | |
| Mass | 1.21±0.02[5] M☉ |
| Radius | 1.27±0.03[5] R☉ |
| Luminosity | 2.08±0.01[5] L☉ |
| Surface gravity (log g) | 4.31±0.03[5] cgs |
| Temperature | 6,163±41[5] K |
| Metallicity [Fe/H] | +0.11[4] dex |
| Rotation | 12.3±0.15 d[6] |
| Rotational velocity (v sin i) | 3.6+0.3 −1.0[6] km/s |
| Age | 2.6±0.6[5] Gyr |
| Other designations | |
| Citalá, BD−05°1910, HD 52265, HIP 33719, HR 2622, SAO 134031[7] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
It was given the proper name Citalá, meaning "river of stars" in the native Nahuat language. The name was selected in the NameExoWorlds campaign by El Salvador, during the 100th anniversary of the IAU.[8][9]
This is a G-type main-sequence star with a stellar classification of G0 V.[3] It is 21% more massive than the Sun and is 27% larger in radius. The star is 2.6 billion years,[5] and is spinning with a rotation period of 12.3 days.[6] It is radiating more than double the luminosity of the Sun from its photosphere at an effective temperature of 6,163 K.[5] The level of chromospheric activity is similar to the Sun.[4]
Planetary system
In 2000 the California and Carnegie Planet Search team announced the discovery of an extrasolar planet orbiting the star.[4] It was independently discovered by the Geneva Extrasolar Planet Search team.[10][11] The planet has since been designated Cayahuanca by the IAU, which means "the rock" in the Nahuat language.[9] A possible two-planet model was proposed in 2013,[12] but was not supported by follow-up studies.[13]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b / Cayahuanca | ≥1.21±0.05 MJ | 0.520±0.009 | 119.27±0.02 | 0.27±0.02 | — | — |