HIP 79431

Last updated
HIP 79431 / Sharjah
Observation data
Epoch J2000.0        Equinox J2000.0
Constellation Scorpius
Right ascension 16h 12m 41.780s [1]
Declination −18° 52′ 31.81″ [1]
Apparent magnitude  (V)11.34 [2]
Characteristics
Spectral type M3V [3]
Apparent magnitude  (B)12.826 [2]
Apparent magnitude  (R)10.46 [2]
Apparent magnitude  (I)9.370 [2]
Apparent magnitude  (J)7.555±0.026 [2]
Apparent magnitude  (H)6.855±0.044 [2]
Apparent magnitude  (K)6.589±0.018 [2]
B−V color index 1.486±0.011 [2]
V−R color index 0.88 [2]
R−I color index 1.09 [2]
Astrometry
Radial velocity (Rv)−4.66±0.28 [4]  km/s
Proper motion (μ)RA: 35.707  mas/yr [1]
Dec.: −214.050  mas/yr [1]
Parallax (π)68.7833 ± 0.1217  mas [1]
Distance 47.42 ± 0.08  ly
(14.54 ± 0.03  pc)
Absolute magnitude  (MV)10.55 [2]
Details
Mass 0.49±0.05 M☉ [5]
0.445 M☉ [6]
0.466 [7]   M☉
Radius 0.54±0.02 R☉ [8]
0.391  R☉ [6]
0.442 [7]   R☉
Surface gravity (log g)4.86 cgs [6]
4.815 [7]   cgs
Temperature 3,689±20 [9]   K
Metallicity [Fe/H]+0.46±0.17 [9]   dex
Other designations
Sharjah, HIP  79431, LP  804-27, NLTT  42226 [10]
Database references
SIMBAD data
Exoplanet Archive data
ARICNS data

HIP 79431 is a red dwarf star with a planetary companion in the constellation Scorpius. It has the proper name Sharjah, as selected in the NameExoWorlds campaign by United Arab Emirates, during the 100th anniversary of the IAU. Sharjah is the cultural capital of United Arab Emirates. [11] [12] The star has an apparent visual magnitude of 11.34, [2] which is far too faint to be visible to the naked eye. Based on parallax measurements, this system is located at a distance of 47.4  light-years from the Sun. It is drifting closer with a radial velocity of −5 km/s. [4]

This is an M-type main-sequence star with a stellar classification of M3V. [3] This star is smaller, cooler, dimmer, and less massive than the Sun, but the estimated metal content is 2.5 times as much as the Sun. The level of chromospheric activity does not appear to be unusually high for a star of this class. [9]

In 2010, a superjovian exoplanetary companion was discovered using the radial-velocity method. It is orbiting at a distance of 0.36  AU from the hos star with a period of 0.3 years and an eccentricity (ovalness) of 0.29. Since the inclination of the orbit is unknown, only a lower bound on the mass can be determined. It has at least 2.1 times the mass of Jupiter. [5]

The HIP 79431 planetary system [5]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b / Barajeel ≥2.1  MJ 0.36111.7 ± 0.70.29 ± 0.02——

See also

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References

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  8. ↑ Stassun, Keivan G.; et al. (2016). "Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes". The Astronomical Journal. 153 (3): 136. arXiv: 1609.04389 . Bibcode:2017AJ....153..136S. doi: 10.3847/1538-3881/aa5df3 . S2CID   119219062.
  9. 1 2 3 Rojas-Ayala, Bárbara; et al. (April 2012), "Metallicity and Temperature Indicators in M Dwarf K-band Spectra: Testing New and Updated Calibrations with Observations of 133 Solar Neighborhood M Dwarfs", The Astrophysical Journal, 748 (2): 93, arXiv: 1112.4567 , Bibcode:2012ApJ...748...93R, doi:10.1088/0004-637X/748/2/93, S2CID   41902340
  10. ↑ "LP 804-27". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2021-11-13.
  11. ↑ "Approved names". NameExoworlds. Retrieved 2020-01-02.
  12. ↑ "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
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