HIP 79431
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 16h 12m 41.77s |
| Declination | −18° 52′ 31.8″ |
| Apparent magnitude (V) | 11.337 |
| Characteristics | |
| Spectral type | M3V |
| Apparent magnitude (B) | 14.39 |
| Apparent magnitude (R) | 10.46 |
| Apparent magnitude (I) | 9.37 |
| Apparent magnitude (J) | 7.555 |
| Apparent magnitude (H) | 6.855 |
| Apparent magnitude (K) | 6.589 |
| B−V color index | 3.05 |
| V−R color index | 0.88 |
| R−I color index | 1.09 |
| Variable type | none |
| Astrometry | |
| Proper motion (μ) | RA: 24.12 mas/yr Dec.: −210.89 mas/yr |
| Parallax (π) | 69.46 ± 3.12 mas[1] |
| Distance | 47 ± 2 ly (14.4 ± 0.6 pc) |
| Absolute magnitude (MV) | 10.47 |
| Details | |
| Mass | 0.49 ± 0.05 M☉ |
| Temperature | 3,689 ± 20[2] K |
| Metallicity [Fe/H] | +0.46 ± 0.17[2] dex |
| Other designations | |
Sharjah, LP 804-27, NLTT 42226 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| ARICNS | data |
HIP 79431 is an 11th magnitude M-type main sequence star located approximately 47 light years away in the constellation Scorpius. This star is smaller, cooler, dimmer, and less massive than our Sun. Also its metal content is 2.5 times as much as the Sun. In 2010, a superjovian planet was found in orbit around the star. This planet is one of the most massive found around a red dwarf star.
The star HIP 79431 is named Sharjah. The name was 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.[3][4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥2.1 MJ | 0.36 | 111.7 ± 0.7 | 0.29 ± 0.02 | — | — |
See also
References
- ^ Validation of the new Hipparcos reduction, van Leeuwen, F. 2007
- ^ a b 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" (PDF), The Astrophysical Journal, 748 (2): 93, arXiv:1112.4567, Bibcode:2012ApJ...748...93R, doi:10.1088/0004-637X/748/2/93, S2CID 41902340
- ^ "Approved names". NameExoworlds. Retrieved 2020-01-02.
- ^ "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
- ^ Apps; et al. (2010). "M2K: I. A Jupiter-Mass Planet Orbiting the M3V Star HIP 79431" (abstract). Publications of the Astronomical Society of the Pacific. 122 (888): 156–161. arXiv:1001.1174. Bibcode:2010PASP..122..156A. doi:10.1086/651058. S2CID 119186731. (web preprint)
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