Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Centaurus [1] |
Right ascension | 13h 57m 17.239s [2] |
Declination | −56° 02′ 24.16″ [2] |
Apparent magnitude (V) | 7.54 [1] |
Characteristics | |
Spectral type | G2V [3] |
B−V color index | 0.593±0.002 [4] [1] |
Astrometry | |
Radial velocity (Rv) | 19.603±0.0004 [5] km/s |
Proper motion (μ) |
RA: −249.354
mas/
yr
[2] Dec.: −84.570 mas/ yr [2] |
Parallax (π) | 24.0593 ± 0.0269 mas [2] |
Distance | 135.6 ± 0.2
ly (41.56 ± 0.05 pc) |
Absolute magnitude (MV) | 4.27 [1] |
Details | |
Mass | 1.16±0.02 [6] M☉ |
Radius | 1.15±0.03 [6] R☉ |
Luminosity | 1.62±0.04 [6] L☉ |
Surface gravity (log g) | 4.38±0.03 [6] cgs |
Temperature | 6,089±47 [6] K |
Metallicity [Fe/H] | 0.16 [4] dex |
Rotation | 8.6 days [4] |
Rotational velocity (v sin i) | 2.6 [4] km/s |
Age | 1.9±1.0 [6] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
HD 121504 is a star with an orbiting exoplanet in the southern constellation of Centaurus. It is located at a distance of 136 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of 19.6 km/s. [5] With an apparent visual magnitude of 7.54, [1] this star is too faint to be visible to the naked eye. It shows a high proper motion, traversing the celestial sphere at an angular rate of 0.270 arcsec yr−1. [8]
The spectrum of this star presents as an ordinary G-type main-sequence star, a yellow dwarf similar in appearance to the Sun, having a stellar classification of G2V. [3] It is roughly two billion years old and is spinning with a rotation period of 8.6 days. The star has 16% more mass than the Sun and a 15% greater radius. [6] The metallicity (the abundance of elements more massive than helium) is higher than solar. [4] The star is radiating 162% of the luminosity of the Sun from its photosphere at an effective temperature of 6,089 K. [6]
A nearby visual companion, designated as SAO 241323 has been proposed as a component of the system. However, the pair form an optical binary with an angular separation of 34.2″, [4] and in reality this is a white giant star located thousands of light years away.[ citation needed]
In 2000 the Geneva Extrasolar Planet Search Team announced the discovery of an extrasolar planet orbiting the star. [9]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | >1.22 MJ | 0.33 | 63.33 ± 0.03 | 0.03 ± 0.01 | — | — |