HD 121504

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

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 for about 135 light years and thus is not visible to the unaided eye; binoculars or small telescope is required to see this star.

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

References

  1. 1 2 3 4 5 Brown, A. G. A; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512. Gaia Data Release 1 catalog entry
  2. 1 2 3 "HD 121504". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-04-03.
  3. 1 2 3 Mayor, M.; et al. (2004). "The CORALIE survey for southern extra-solar planets XII. Orbital solutions for 16 extra-solar planets discovered with CORALIE". Astronomy and Astrophysics. 415 (1): 391–402. arXiv:astro-ph/0310316. Bibcode:2004A&A...415..391M. doi:10.1051/0004-6361:20034250.
  4. ↑ "European Southern Observatory: Six Extrasolar Planets Discovered". SpaceRef Interactive Inc. 7 August 2000. Retrieved 15 August 2009.

Coordinates: 13h 57m 17.2375s, −56° 02′ 24.153″


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