# HIP 70849

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Star in the constellation Lupus

HIP 70849 Observation data Epoch J2000.0 Equinox J2000.0 Constellation Lupus Right ascension 14h 29m 18.56436s[1] Declination −46° 27′ 49.7378″[1] Apparent magnitude (V) 10.36[2] Characteristics Spectral type K7Vk[3] Apparent magnitude (B) 11.787[2] Apparent magnitude (J) 7.639±0.023[2] Apparent magnitude (H) 7.006±0.061[2] Apparent magnitude (K) 6.790±0.027[2] B−V color index 1.427±0.019[2] Variable type 8.50[2] Astrometry Radial velocity (Rv) −0.134±0.0013[4] km/s Proper motion (μ) RA: −44.051±0.017 mas/yr[1] Dec.: −201.577±0.020 mas/yr[1] Parallax (π) 41.4618±0.0175 mas[1] Distance 78.66 ± 0.03 ly (24.12 ± 0.01 pc) Absolute magnitude (MV) 8.5[2] Details Mass 0.647±0.013[5] M☉ Radius 0.62±0.02[6] R☉ Luminosity (bolometric) 0.0892±0.0005[6] L☉ Surface gravity (log g) 3.70±0.09[7] cgs Temperature 4,103±25[7] K Metallicity [Fe/H] 0.00±0.03[7] dex Rotation 41.2 d[6] Rotational velocity (v sin i) 1.93 km/s[6] 0.30±0.30[7] km/s Age 3.6±0.15[6] Gyr Other designations NSV 6678, CD−45°9206, GJ 550.3, HIP 70849, PPM 760399, LTT 5717, NLTT 37446[8] Database references SIMBAD data Exoplanet Archive data

**HIP 70849** is a [star](/source/Star) with two non-stellar companions in the southern [constellation](/source/Constellation) [Lupus](/source/Lupus_(constellation)). It is a 10th [magnitude](/source/Apparent_magnitude) star, making it too faint to be visible to the naked eye.[2] The system is located at a distance of 78.7 [light-years](/source/Light-year) from the [Sun](/source/Sun) based on [parallax](/source/Stellar_parallax) measurements.[1]

This is a [K-type main-sequence star](/source/K-type_main-sequence_star) with a [stellar classification](/source/Stellar_classification) of K7Vk,[3] where the 'k' indicates interstellar absorption features in the [spectrum](/source/Stellar_spectrum). The star is [magnetically active](/source/Magnetic_activity) with a 10.1±1.4 yr starspot cycle. It appears about 3.6 billion years old and the light emission shows a 41.2 day periodicity, which is likely the [rotation period](/source/Rotation_period).[6] This star, which resembles a brighter [red dwarf](/source/Red_dwarf), is smaller and less massive than the Sun. It is radiating just 9%[6] of the luminosity of the Sun from its [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 4,103 K.[7]

The companion is a T4.5 [brown dwarf](/source/Brown_dwarf) companion orbiting it at a separation around ~9,000 [AU](/source/Astronomical_unit).[9][10]

## Planetary system

In 2009, a [gas giant](/source/Gas_giant) planet was found in orbit around it.[11] Designated HIP 70849 b, it has 4.55 times the mass of [Jupiter](/source/Jupiter) and takes 10.05 years to orbit at a [semimajor axis](/source/Semimajor_axis) of 4.04 [AU](/source/Astronomical_unit), with a high eccentricity.[5]

The HIP 70849 planetary system[5] Companion (in order from star) Mass Semimajor axis (AU) Orbital period (years) Eccentricity Inclination (°) Radius b 4.55±0.51 MJ 4.037±0.030 10.046+0.054 −0.046 0.584+0.070 −0.079 130+14 −26 —

## References

1. ^ [***a***](#cite_ref-GaiaDR3_1-0) [***b***](#cite_ref-GaiaDR3_1-1) [***c***](#cite_ref-GaiaDR3_1-2) [***d***](#cite_ref-GaiaDR3_1-3) [***e***](#cite_ref-GaiaDR3_1-4) 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%3D6099000589942631424%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-Anderson_Francis_2012_2-0) [***b***](#cite_ref-Anderson_Francis_2012_2-1) [***c***](#cite_ref-Anderson_Francis_2012_2-2) [***d***](#cite_ref-Anderson_Francis_2012_2-3) [***e***](#cite_ref-Anderson_Francis_2012_2-4) [***f***](#cite_ref-Anderson_Francis_2012_2-5) [***g***](#cite_ref-Anderson_Francis_2012_2-6) [***h***](#cite_ref-Anderson_Francis_2012_2-7) [***i***](#cite_ref-Anderson_Francis_2012_2-8) 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-Gray_et_al_2006_3-0) [***b***](#cite_ref-Gray_et_al_2006_3-1) Gray, R. O.; et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample". *[The Astronomical Journal](/source/The_Astronomical_Journal)*. **132** (1): 161–170. [arXiv](/source/ArXiv_(identifier)):[astro-ph/0603770](https://arxiv.org/abs/astro-ph/0603770). [Bibcode](/source/Bibcode_(identifier)):[2006AJ....132..161G](https://ui.adsabs.harvard.edu/abs/2006AJ....132..161G). [doi](/source/Doi_(identifier)):[10.1086/504637](https://doi.org/10.1086%2F504637). [S2CID](/source/S2CID_(identifier)) [119476992](https://api.semanticscholar.org/CorpusID:119476992).

1. **[^](#cite_ref-Soubiran_et_al_2018_4-0)** 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-An2025_5-0) [***b***](#cite_ref-An2025_5-1) [***c***](#cite_ref-An2025_5-2) An, Qier; Brandt, Timothy D.; Brandt, G. Mirek; Venner, Alexander (2025-08-11). "Orbits and Masses for 156 Companions from Combined Astrometry and Radial Velocities, and A Validation of Gaia Non-Single Star Solutions". *[The Astrophysical Journal Supplement Series](/source/The_Astrophysical_Journal_Supplement_Series)*. [arXiv](/source/ArXiv_(identifier)):[2508.08374](https://arxiv.org/abs/2508.08374).

1. ^ [***a***](#cite_ref-Zurlo_et_al_2018_6-0) [***b***](#cite_ref-Zurlo_et_al_2018_6-1) [***c***](#cite_ref-Zurlo_et_al_2018_6-2) [***d***](#cite_ref-Zurlo_et_al_2018_6-3) [***e***](#cite_ref-Zurlo_et_al_2018_6-4) [***f***](#cite_ref-Zurlo_et_al_2018_6-5) [***g***](#cite_ref-Zurlo_et_al_2018_6-6) Zurlo, A.; et al. (October 2018). ["Imaging radial velocity planets with SPHERE"](https://doi.org/10.1093%2Fmnras%2Fsty1809). *Monthly Notices of the Royal Astronomical Society*. **480** (1): 35–48. [arXiv](/source/ArXiv_(identifier)):[1807.01324](https://arxiv.org/abs/1807.01324). [Bibcode](/source/Bibcode_(identifier)):[2018MNRAS.480...35Z](https://ui.adsabs.harvard.edu/abs/2018MNRAS.480...35Z). [doi](/source/Doi_(identifier)):[10.1093/mnras/sty1809](https://doi.org/10.1093%2Fmnras%2Fsty1809).

1. ^ [***a***](#cite_ref-Sousa_et_al_2018_7-0) [***b***](#cite_ref-Sousa_et_al_2018_7-1) [***c***](#cite_ref-Sousa_et_al_2018_7-2) [***d***](#cite_ref-Sousa_et_al_2018_7-3) [***e***](#cite_ref-Sousa_et_al_2018_7-4) Sousa, S. G.; et al. (November 2018). "SWEET-Cat updated. New homogenous spectroscopic parameters". *Astronomy & Astrophysics*. **620**: 13. [arXiv](/source/ArXiv_(identifier)):[1810.08108](https://arxiv.org/abs/1810.08108). [Bibcode](/source/Bibcode_(identifier)):[2018A&A...620A..58S](https://ui.adsabs.harvard.edu/abs/2018A&A...620A..58S). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201833350](https://doi.org/10.1051%2F0004-6361%2F201833350). [S2CID](/source/S2CID_(identifier)) [119374557](https://api.semanticscholar.org/CorpusID:119374557). A58.

1. **[^](#cite_ref-SIMBAD_8-0)** ["CD-45 9206"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=CD-45+9206). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2021-11-11.

1. **[^](#cite_ref-Lodieu2014_9-0)** Lodieu, N.; et al. (2014). "Binary frequency of planet-host stars at wide separations. A new brown dwarf companion to a planet-host star". *Astronomy and Astrophysics*. **569**. A120. [arXiv](/source/ArXiv_(identifier)):[1408.1208](https://arxiv.org/abs/1408.1208). [Bibcode](/source/Bibcode_(identifier)):[2014A&A...569A.120L](https://ui.adsabs.harvard.edu/abs/2014A&A...569A.120L). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201424210](https://doi.org/10.1051%2F0004-6361%2F201424210). [S2CID](/source/S2CID_(identifier)) [118516214](https://api.semanticscholar.org/CorpusID:118516214).

1. **[^](#cite_ref-Šubjak2022_10-0)** Šubjak, J.; Lodieu, N.; et al. (2023). "Search for planets around stars with wide brown dwarfs". *[Astronomy & Astrophysics](/source/Astronomy_%26_Astrophysics)*. **671**: A10. [arXiv](/source/ArXiv_(identifier)):[2212.03757](https://arxiv.org/abs/2212.03757). [Bibcode](/source/Bibcode_(identifier)):[2023A&A...671A..10S](https://ui.adsabs.harvard.edu/abs/2023A&A...671A..10S). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202244238](https://doi.org/10.1051%2F0004-6361%2F202244238). [S2CID](/source/S2CID_(identifier)) [254366726](https://api.semanticscholar.org/CorpusID:254366726).

1. **[^](#cite_ref-Ségransan2011_11-0)** Ségransan, D.; et al. (2011). "The HARPS search for southern extra-solar planets. XXIX. Four new planets in orbit around the moderately active dwarfs HD 63765, HD 104067, HD 125595, and HIP 70849". *Astronomy and Astrophysics*. **535**. A54. [arXiv](/source/ArXiv_(identifier)):[1107.0339](https://arxiv.org/abs/1107.0339). [Bibcode](/source/Bibcode_(identifier)):[2011A&A...535A..54S](https://ui.adsabs.harvard.edu/abs/2011A&A...535A..54S). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/200913580](https://doi.org/10.1051%2F0004-6361%2F200913580). [S2CID](/source/S2CID_(identifier)) [119197766](https://api.semanticscholar.org/CorpusID:119197766).

v t e Constellation of Lupus List of stars in Lupus Lupus in Chinese astronomy Stars Bayer α (Uridim) β γ δ ε ζ η θ ι κ λ μ ν1 ν2 ξ ο π ρ σ τ1 τ2 υ φ1 φ2 χ ψ1 ψ2 ω Flamsteed 1 (i) 2 (f) Variable RU EX GG GQ HR II IL IM KT (d) V407 V462 HR 5362 5364 5401 5651 (e) 5724 (k) 5825 (g) 5943 5967 HD 134004 135344 136164 141943 142527 143811 Other Gliese 588 HIP 70849 Lupus-TR-3 SSSPM J1549−3544 WASP-132 Exoplanets GQ Lupi b HIP 70849 b Lupus-TR-3b WASP-178b Star clusters NGC 5749 NGC 5822 NGC 5824 NGC 5927 NGC 5986 Nebulae IC 4406 NGC 5882 Galaxies IC 4444 NGC 5530 NGC 5643 Astronomical events SN 1006 Category

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Adapted from the Wikipedia article [HIP 70849](https://en.wikipedia.org/wiki/HIP_70849) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/HIP_70849?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.