HD 121504

HD 121504 is an 8th magnitude star in the constellation of Centaurus. It is a yellow dwarf (spectral type G2V) and remarkably similar to our Sun, only slightly brighter like α Centauri A. However, it is located at a distance of about 135 light years and thus is not visible to the unaided eye; binoculars or small telescope is required to see this star.

HD 121504
Observation data
Epoch J2000      Equinox J2000
Constellation Centaurus
Right ascension 13h 57m 17.2388s[1]
Declination −56° 02 24.159[1]
Apparent magnitude (V) 7.52[2]
Characteristics
Spectral type G2V[2]
B−V color index 0.593[3]
Astrometry
Proper motion (μ) RA: −249.397±0.048[1] mas/yr
Dec.: −84.656±0.056[1] mas/yr
Parallax (π)24.24 ± 0.25[1] mas
Distance135 ± 1 ly
(41.3 ± 0.4 pc)
Details[3]
Mass1.18 M
Luminosity1.55 L
Surface gravity (log g)4.64 cgs
Temperature6075 K
Metallicity [Fe/H]0.16 dex
Rotation8.6 days
Rotational velocity (v sin i)2.6 km/s
Age1.2 Gyr
Other designations
CD-55°5427, GC 18842, HIP 68162 LTT 5432, NLTT 35734, SAO 241321[2]
Database references
SIMBADdata
Exoplanet Archivedata

Another component, designated as SAO 241323 has been proposed as a component of the system. However, the star is an optical binary component and in reality is a white giant star located thousands of light years away.

In 2000 the Geneva Extrasolar Planet Search Team announced the discovery of an extrasolar planet orbiting the star.[4]

The HD 121504 planetary system[3]
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

See also

  • List of extrasolar planets

References


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