# HIP 70849 b

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Extrasolar planet in the constellation Lupus

HIP 70849 b Discovery Discovered by Segransan et al.[1] Discovery site La Silla Observatory Discovery date October 19, 2009[2] Detection method radial velocity (HARPS) Orbital characteristics[3] Semi-major axis 3.99+0.06 −0.07 AU Eccentricity 0.65+0.02 −0.01 Orbital period (sidereal) 3,649 ± 18 days (9.990 ± 0.049 a) Inclination 96°±16° Longitude of ascending node 35°±6° Argument of periastron 182°±1° Star HIP 70849 Physical characteristics[3] Mass 4.5+0.4 −0.3 MJ

**HIP 70849 b** is an [extrasolar planet](/source/Extrasolar_planet) which orbits the [K-type](/source/K-type_star) [main sequence](/source/Main_sequence) [star](/source/Star) [HIP 70849](/source/HIP_70849), located approximately 79 [light years](/source/Light_year) away in the [constellation](/source/Constellation) [Lupus](/source/Lupus_(constellation)). This planet was detected by [HARPS](/source/HARPS) and announced on October 19, 2009, together with 31 other planets.[2] Its parameters were initially poorly constrained, estimated to have a [minimum mass](/source/Minimum_mass) of 3-15 [MJ](/source/Jupiter_mass) and take anywhere from 5-90 years to orbit the star at a [semimajor axis](/source/Semimajor_axis) of 4.5-36 [AU](/source/Astronomical_unit), with the [eccentricity](/source/Orbital_eccentricity) and [inclination](/source/Inclination) being unknown.[1] This was significantly updated in a December 2022 paper, which found much better constrained parameters including a high eccentricity,[4] and in a January 2023 paper which determined the planet's inclination and true mass via [astrometry](/source/Astrometry).[3]

## References

1. ^ [***a***](#cite_ref-Ségransan2011_1-0) [***b***](#cite_ref-Ségransan2011_1-1) 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"](http://www.aanda.org/articles/aa/full_html/2011/11/aa13580-09/aa13580-09.html). *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).

1. ^ [***a***](#cite_ref-eso0939_2-0) [***b***](#cite_ref-eso0939_2-1) ["32 New Exoplanets Found"](https://www.eso.org/public/news/eso0939/). [ESO](/source/European_Southern_Observatory). 19 October 2009. Retrieved 4 January 2023.

1. ^ [***a***](#cite_ref-Philipot2023_3-0) [***b***](#cite_ref-Philipot2023_3-1) [***c***](#cite_ref-Philipot2023_3-2) Philipot, F.; Lagrange, A.-M.; et al. (January 2023). "Updated characterization of long-period single companion by combining radial velocity, relative astrometry, and absolute astrometry". *Astronomy & Astrophysics*. **670**: A65. [arXiv](/source/ArXiv_(identifier)):[2301.01263](https://arxiv.org/abs/2301.01263). [Bibcode](/source/Bibcode_(identifier)):[2023A&A...670A..65P](https://ui.adsabs.harvard.edu/abs/2023A&A...670A..65P). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202245396](https://doi.org/10.1051%2F0004-6361%2F202245396). [S2CID](/source/S2CID_(identifier)) [255393653](https://api.semanticscholar.org/CorpusID:255393653).

1. **[^](#cite_ref-Šubjak2022_4-0)** 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).

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