HD 121504

HD 121504
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]
Distance135.6 ± 0.2 ly
(41.56 ± 0.05 pc)
Absolute magnitude (MV)4.27[1]
Details
Mass1.16±0.02[6] M☉
Radius1.15±0.03[6] R☉
Luminosity1.62±0.04[6] L☉
Surface gravity (log g)4.38±0.03[6] cgs
Temperature6,089±47[6] K
Metallicity [Fe/H]0.16[4] dex
Rotation8.6 days[4]
Rotational velocity (v sin i)2.6[4] km/s
Age1.9±1.0[6] Gyr
Other designations
CD−55°5427, GC 18842, HD 121504, HIP 68162, SAO 241321, WDS J13573-5602A, LTT 5432, NLTT 35734[7]
Database references
SIMBADdata
Exoplanet Archivedata

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]

  1. ^ a b c d e Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1979 was invoked but never defined (see the help page).
  4. ^ a b c d e f Cite error: The named reference Mayor2004 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Soubiran_et_al_2018 was invoked but never defined (see the help page).
  6. ^ a b c d e f g h Cite error: The named reference Bonfanti_et_al_2016 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Luyten1995 was invoked but never defined (see the help page).