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HIP 79431

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]
Distance47.42 ± 0.08 ly
(14.54 ± 0.03 pc)
Absolute magnitude (MV)10.55[2]
Details
Mass0.49±0.05 M☉[5]
0.445 M☉[6]
0.466[7] M☉
Radius0.54±0.02 R☉[8]
0.391 R☉[6]
0.442[7] R☉
Surface gravity (log g)4.86 cgs[6]
4.815[7] cgs
Temperature3,689±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
SIMBADdata
Exoplanet Archivedata
ARICNSdata

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 host 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 0.36 111.7 ± 0.7 0.29 ± 0.02 — —
  1. ^ a b c d Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i j k l Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Gray_et_al_2006 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Terrien_et_al_2015 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Apps2010 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Doyle_et_al_2018 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Tsuji_Nakajima_2014 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Stassun_et_al_2016 was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference apj748_2_934 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference nameexoworlds was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference IAU1912 was invoked but never defined (see the help page).

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