Astronomy:HIP 70849

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Short description: Star in the constellation Lupus
HIP 70849
Observation data
Equinox J2000.0]] (ICRS)
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[1] mas/yr
Dec.: −201.577±0.020[1] mas/yr
Parallax (π)41.4618 ± 0.0175[1] mas
Distance78.66 ± 0.03 ly
(24.12 ± 0.01 pc)
Absolute magnitude (MV)8.5[2]
Details
Mass0.63±0.03[5]
0.76±0.07[6] M☉
Radius0.62±0.02[5] R☉
Luminosity (bolometric)0.0892±0.0005[5] L☉
Surface gravity (log g)3.70±0.09[6] cgs
Temperature4,103±25[6] K
Metallicity [Fe/H]0.00±0.03[6] dex
Rotation41.2 d[5]
Rotational velocity (v sin i)1.93 km/s[5]
0.30±0.30[6] km/s
Age3.6±0.15[5] Gyr
Other designations
NSV 6678, CD−45°9206, GJ 550.3, HIP 70849, PPM 760399, LTT 5717, NLTT 37446[7]
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

HIP 70849 is a star with two non-stellar companions in the southern constellation Lupus. It is a 10th 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 from the Sun based on parallax measurements.[1]

This is a K-type main-sequence star with a stellar classification of K7Vk,[3] where the 'k' indicates interstellar absorption features in the spectrum. The star is magnetically active 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.[5] This star, which resembles a brighter red dwarf, is smaller and less massive than the Sun. It is radiating just 9%[5] of the luminosity of the Sun from its photosphere at an effective temperature of 4,103 K.[6]

In 2009, a gas giant planet was found in orbit around it.[8] Designated HIP 70849 b, it has 4.5 times the mass of Jupiter and takes more than 3000 days to orbit at a semimajor axis of 3.99 astronomical unit|AU, with a high eccentricity.[9] There is also a T4.5 brown dwarf companion orbiting ~9000AU from HIP 70849.[10][11]

The HIP 70849 planetary system[9]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 4.5+0.4
−0.3 MJ 		3.99+0.06
−0.07 		3649±18 0.65+0.02
−0.01 		96±16° —

See also

  • List of extrasolar planets

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  3. ↑ 3.0 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 132 (1): 161–170. doi:10.1086/504637. Bibcode: 2006AJ....132..161G. 
  4. ↑ Soubiran, C. et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics 616: A7. doi:10.1051/0004-6361/201832795. Bibcode: 2018A&A...616A...7S. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 Zurlo, A. et al. (October 2018). "Imaging radial velocity planets with SPHERE". Monthly Notices of the Royal Astronomical Society 480 (1): 35–48. doi:10.1093/mnras/sty1809. Bibcode: 2018MNRAS.480...35Z. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 Sousa, S. G. et al. (November 2018). "SWEET-Cat updated. New homogenous spectroscopic parameters". Astronomy & Astrophysics 620: 13. doi:10.1051/0004-6361/201833350. A58. Bibcode: 2018A&A...620A..58S. 
  7. ↑ "CD-45 9206". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=CD-45+9206. 
  8. ↑ 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. doi:10.1051/0004-6361/200913580. Bibcode: 2011A&A...535A..54S. 
  9. ↑ 9.0 9.1 Philipot, F. et al. (January 2023). "Updated characterization of long-period single companion by combining radial velocity, relative astrometry, and absolute astrometry". Astronomy & Astrophysics 670: A65. doi:10.1051/0004-6361/202245396. Bibcode: 2023A&A...670A..65P. 
  10. ↑ 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. doi:10.1051/0004-6361/201424210. Bibcode: 2014A&A...569A.120L. 
  11. ↑ Šubjak, J. et al. (2023). "Search for planets around stars with wide brown dwarfs". Astronomy & Astrophysics 671: A10. doi:10.1051/0004-6361/202244238. 

Coordinates: Sky map 14h 29m 18.5631s, −46° 27′ 49.738″



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