HIP 79431

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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[1] mas
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
LP 804-27, NLTT 42226
Database references
SIMBAD data
Exoplanet Archive data
ARICNS data
Extrasolar Planets
Encyclopaedia
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 HIP 79431 planetary system[3]
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[edit]

References[edit]

  1. ^ Validation of the new Hipparcos reduction, van Leeuwen, F. 2007
  2. ^ 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, The Astrophysical Journal 748 (2): 93, arXiv:1112.4567, Bibcode:2012ApJ...748...93R, doi:10.1088/0004-637X/748/2/93 
  3. ^ 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.  (web preprint)

Coordinates: Sky map 16h 12m 41.77s, −1852° 31.8′ 49″