# HD 121504

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Yellow dwarf star in the constellation Centaurus

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] 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 CD−55°5427, GC 18842, HD 121504, HIP 68162, SAO 241321, WDS J13573-5602A, LTT 5432, NLTT 35734[7] Database references SIMBAD data Exoplanet Archive data

**HD 121504** is a [star](/source/Star) with an orbiting [exoplanet](/source/Exoplanet) in the southern [constellation](/source/Constellation) of [Centaurus](/source/Centaurus). It is located at a distance of 136 [light years](/source/Light_year) from the Sun based on [parallax](/source/Stellar_parallax) measurements, and is drifting further away with a [radial velocity](/source/Radial_velocity) of 19.6 km/s.[5] With an [apparent visual magnitude](/source/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](/source/Proper_motion), traversing the [celestial sphere](/source/Celestial_sphere) at an [angular rate](/source/Angular_rate) of 0.270 arcsec yr−1.[8]

The [spectrum](/source/Stellar_spectrum) of this star presents as an ordinary [G-type main-sequence star](/source/G-type_main-sequence_star), a yellow dwarf similar in appearance to the Sun, having a [stellar classification](/source/Stellar_classification) of G2V.[3] It is roughly two billion years old and is spinning with a [rotation period](/source/Rotation_period) of 8.6 days. The star has 16% more mass than the Sun and a 15% greater radius.[6] The [metallicity](/source/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](/source/Photosphere) at an [effective temperature](/source/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](/source/Optical_binary) with an [angular separation](/source/Angular_separation) of 34.2″,[4] and in reality this is a white [giant star](/source/Giant_star) located thousands of light years away.[*[citation needed](https://en.wikipedia.org/wiki/Wikipedia:Citation_needed)*]

## Exoplanet

In 2000 the [Geneva Extrasolar Planet Search Team](/source/Geneva_Extrasolar_Planet_Search_Team) announced the discovery of an [extrasolar planet](/source/Extrasolar_planet) orbiting the star.[9]

The HD 121504 planetary system[4] 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](/source/List_of_extrasolar_planets)

## References

1. ^ [***a***](#cite_ref-Anderson_Francis_2012_1-0) [***b***](#cite_ref-Anderson_Francis_2012_1-1) [***c***](#cite_ref-Anderson_Francis_2012_1-2) [***d***](#cite_ref-Anderson_Francis_2012_1-3) [***e***](#cite_ref-Anderson_Francis_2012_1-4) Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", *Astronomy Letters*, **38** (5): 331, [arXiv](/source/ArXiv_(identifier)):[1108.4971](https://arxiv.org/abs/1108.4971), [Bibcode](/source/Bibcode_(identifier)):[2012AstL...38..331A](https://ui.adsabs.harvard.edu/abs/2012AstL...38..331A), [doi](/source/Doi_(identifier)):[10.1134/S1063773712050015](https://doi.org/10.1134%2FS1063773712050015), [S2CID](/source/S2CID_(identifier)) [119257644](https://api.semanticscholar.org/CorpusID:119257644)

1. ^ [***a***](#cite_ref-GaiaDR3_2-0) [***b***](#cite_ref-GaiaDR3_2-1) [***c***](#cite_ref-GaiaDR3_2-2) [***d***](#cite_ref-GaiaDR3_2-3) Vallenari, A.; et al. (Gaia collaboration) (2023). ["*Gaia* Data Release 3. Summary of the content and survey properties"](https://doi.org/10.1051%2F0004-6361%2F202243940). *Astronomy and Astrophysics*. **674**: A1. [arXiv](/source/ArXiv_(identifier)):[2208.00211](https://arxiv.org/abs/2208.00211). [Bibcode](/source/Bibcode_(identifier)):[2023A&A...674A...1G](https://ui.adsabs.harvard.edu/abs/2023A&A...674A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202243940](https://doi.org/10.1051%2F0004-6361%2F202243940). [S2CID](/source/S2CID_(identifier)) [244398875](https://api.semanticscholar.org/CorpusID:244398875). [Gaia DR3 record for this source](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-source=+I%2F355&-from=nav&-nav=cat%3AI%2F355%26tab%3A%7BI%2F355%2Fgaiadr3%7D%26key%3Asource%3D1355%2Fgaiadr3%26HTTPPRM%3A%26-out.add%3D.%26Source%3D%3D%3D5872266689455300608%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-Houk1979_3-0) [***b***](#cite_ref-Houk1979_3-1) Houk, Nancy (1979). *Michigan catalogue of two-dimensional spectral types for the HD stars*. Vol. 1. Ann Arbor, Michigan: Department of Astronomy, University of Michigan. [Bibcode](/source/Bibcode_(identifier)):[1978mcts.book.....H](https://ui.adsabs.harvard.edu/abs/1978mcts.book.....H).

1. ^ [***a***](#cite_ref-Mayor2004_4-0) [***b***](#cite_ref-Mayor2004_4-1) [***c***](#cite_ref-Mayor2004_4-2) [***d***](#cite_ref-Mayor2004_4-3) [***e***](#cite_ref-Mayor2004_4-4) [***f***](#cite_ref-Mayor2004_4-5) [***g***](#cite_ref-Mayor2004_4-6) 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](/source/ArXiv_(identifier)):[astro-ph/0310316](https://arxiv.org/abs/astro-ph/0310316). [Bibcode](/source/Bibcode_(identifier)):[2004A&A...415..391M](https://ui.adsabs.harvard.edu/abs/2004A&A...415..391M). [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20034250](https://doi.org/10.1051%2F0004-6361%3A20034250). [S2CID](/source/S2CID_(identifier)) [5233877](https://api.semanticscholar.org/CorpusID:5233877).

1. ^ [***a***](#cite_ref-Soubiran_et_al_2018_5-0) [***b***](#cite_ref-Soubiran_et_al_2018_5-1) Soubiran, C.; et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". *Astronomy and Astrophysics*. **616**: A7. [arXiv](/source/ArXiv_(identifier)):[1804.09370](https://arxiv.org/abs/1804.09370). [Bibcode](/source/Bibcode_(identifier)):[2018A&A...616A...7S](https://ui.adsabs.harvard.edu/abs/2018A&A...616A...7S). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201832795](https://doi.org/10.1051%2F0004-6361%2F201832795). [S2CID](/source/S2CID_(identifier)) [52952408](https://api.semanticscholar.org/CorpusID:52952408).

1. ^ [***a***](#cite_ref-Bonfanti_et_al_2016_6-0) [***b***](#cite_ref-Bonfanti_et_al_2016_6-1) [***c***](#cite_ref-Bonfanti_et_al_2016_6-2) [***d***](#cite_ref-Bonfanti_et_al_2016_6-3) [***e***](#cite_ref-Bonfanti_et_al_2016_6-4) [***f***](#cite_ref-Bonfanti_et_al_2016_6-5) [***g***](#cite_ref-Bonfanti_et_al_2016_6-6) [***h***](#cite_ref-Bonfanti_et_al_2016_6-7) Bonfanti, A.; et al. (2016). "Age consistency between exoplanet hosts and field stars". *Astronomy & Astrophysics*. **585**: 14. [arXiv](/source/ArXiv_(identifier)):[1511.01744](https://arxiv.org/abs/1511.01744). [Bibcode](/source/Bibcode_(identifier)):[2016A&A...585A...5B](https://ui.adsabs.harvard.edu/abs/2016A&A...585A...5B). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201527297](https://doi.org/10.1051%2F0004-6361%2F201527297). [S2CID](/source/S2CID_(identifier)) [53971692](https://api.semanticscholar.org/CorpusID:53971692). A5.

1. **[^](#cite_ref-Simbad_7-0)** ["HD 121504"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+121504). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2018-04-03.

1. **[^](#cite_ref-Luyten1995_8-0)** Luyten, W. J. (June 1995). "VizieR Online Data Catalog: NLTT Catalogue (Luyten, 1979)". *VizieR Online Data Catalog*. [Bibcode](/source/Bibcode_(identifier)):[1995yCat.1098....0L](https://ui.adsabs.harvard.edu/abs/1995yCat.1098....0L).

1. **[^](#cite_ref-9)** ["European Southern Observatory: Six Extrasolar Planets Discovered"](http://www.spaceref.com/news/viewpr.html?pid=2365). SpaceRef Interactive Inc. 7 August 2000. Retrieved 15 August 2009.

v t e Constellation of Centaurus List of stars in Centaurus Centaurus in Chinese astronomy Stars Bayer α A (Rigil Kentaurus) B (Toliman) C (Proxima Centauri) β (Hadar) γ δ ε ζ (Leepwal) η θ (Menkent) ι (Kulou) κ λ μ ν (Heng) ξ1 ξ2 ο1 ο2 π ρ σ τ υ1 υ2 φ χ ψ x1 x2 C3 D E F G H J K M N Q Flamsteed 1 (i) 2 (g) 3 (k) 4 (h) Variable R T V Y RR SV SX BV DY UY V346 V553 V744 V752 V761 (a) V763 (C1) V766 V779 (Krzemiński's star) V803 V810 V816 (Przybylski's Star) V831 V842 V885 V886 V863 V1032 V1369 V1400 V1935 HR 4460 (A) 4466 (C2) 4499 4522 4523 4537 (j) 4546 (B) 4721 4748 (u) 4796 4817 (l) 4831 (w) 4874 (p) 4888 (e) 4889 (n) 4940 (f) 4979 4989 5006 (r) 5041 (m) 5089 (d) 5174 (z) 5222 (y) 5224 5241 5297 5358 (v) 5371 5471 (b) 5485 (c1) 5489 (c2) HD 97413 98176 100453 101581 101930 102117 (Uklun) 103197 107914 108236 109749 110113 113538 113766 114386 114729 115600 116434 (Matza) 117207 117618 (Dofida) 117939 120411 121228 121504 124448 (Popper's Star) 125072 125595 131399 Other 2MASS J1126−5003 2M1207 Gaia BH2 HD 131399 Ab PSR B1259−63 PSR J1311−3430 TOI-763 WASP-15 (Nyamien) WASP-41 WASP-42 WASP-167/KELT-13 Exoplanets 2M1207b b Centauri b HD 101930 b HD 102117 b (Leklsullun) HD 103197 b HD 109749 b HD 113538 b c HD 114386 b HD 114729 b HD 117207 b HD 117618 b (Noifasui) HD 121504 b HIP 65426 b (Najsakopajk) HIP 67522 b NGTS-13b Proxima Centauri b c d WASP-15b (Asye) Star clusters NGC 3766 4230 4507 5281 5286 5316 5460 5617 5662 Other IC 2944 ω Centauri Scorpius–Centaurus association Stock 16 Nebulae NGC 3918 5307 Other Boomerang Nebula Fleming 1 G292.0+1.8 G306.3-0.9 Gum 41 IC 2944 IRAS 13208−6020 RCW 79 RCW 86 Southern Crab Nebula SuWt 2 Galaxies NGC 3557 3568 3749 3783 4444 4603 4622 4650A 4683 4696 4706 4709 4729 4730 4743 4744 4909 4930 4945 4976 5011 A 5026 5064 5082 5090 5091 5102 5114 5121 5128 (Centaurus A) 5161 5206 5253 5266 5291 5398 5408 5419 5483 5516 Other ESO 269-57 ESO 325-4 ESO 383-76 ESO 444-46 Fourcade-Figueroa Object IC 3370 IC 4214 IC 4329A IRAS 13224−3809 J1144−4308 LEDA 677373 PKS 1144−379 PKS 1353−341 PKS 1424−418 Galaxy clusters Abell S740 Centaurus Cluster Shapley Supercluster Astronomical events GW190521 SN 185 SN 1895B (Z) SN 1972E SN 1986G J1407b SN 2019so Category

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Adapted from the Wikipedia article [HD 121504](https://en.wikipedia.org/wiki/HD_121504) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/HD_121504?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.