HD 13931

HD 13931 is a Sun-like star in the northern constellation of Andromeda. It can be viewed with binoculars or a small telescope but is too faint to be seen with the naked eye, having an apparent visual magnitude of 7.60.[2] This object is located at a distance of 155 light years from the Sun, as determined from its parallax, and is drifting further away with a radial velocity of +30 km/s.[1]

HD 13931
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Andromeda
Right ascension  02h 16m 47.3784s[1]
Declination +43° 46′ 22.7896″[1]
Apparent magnitude (V) 7.60[2]
Characteristics
Spectral type G0V[3]
Apparent magnitude (B) 8.237[2]
Apparent magnitude (R) 7.2[4]
Apparent magnitude (I) 6.9[4]
Apparent magnitude (J) 6.452[5]
Apparent magnitude (H) 6.234[5]
Apparent magnitude (K) 6.139[5]
B−V color index 0.640[2]
R−I color index 0.3[4]
Astrometry
Radial velocity (Rv)30.28±0.22[1] km/s
Proper motion (μ) RA: 98.797±0.121[1] mas/yr
Dec.: −183.625±0.107[1] mas/yr
Parallax (π)21.0701 ± 0.0637[1] mas
Distance154.8 ± 0.5 ly
(47.5 ± 0.1 pc)
Absolute magnitude (MV)4.32±0.10[6]
Details[7]
Mass1.04±0.01 M☉
Radius1.18±0.02 R☉
Luminosity1.49±0.01 L☉
Surface gravity (log g)4.3±0.03 cgs
Temperature5868±24 K
Metallicity+0.03±0.04[6]
Rotation~26 days[6]
Age6.8±0.6 Gyr
Other designations
BD+43°459, HD 12467, HIP 10626, SAO 37918, PPM 44946, LTT 10766, NLTT 7491[8]
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

This is an ordinary G-type main-sequence star with a stellar classification of G0V,[3] which indicates it, like the Sun, is generating energy through core hydrogen fusion. It is slightly larger, hotter, brighter, and more massive than our Sun. The metal content is about 8% greater than the Sun, and it has a quiet (magnetically inactive) chromosphere.[6] The star is an estimated 6.8 billion years old and it is spinning with a rotation period of about 26 days[6]

In 2009, a very long-period giant planet, more massive than Jupiter, was found in orbit around the star by measuring changes in the star's radial velocity. This planet takes 11.55 years to orbit the star at the typical distance of 5.15 AU (770 Gm). The planet's eccentricity (0.02) is about the same as Earth.[6]

According to a 2018 research, HD 13931 is the most promising Solar System analogue known, since it has a star similar to the Sun and a planet with mass and semimajor axis similar to Jupiter. Those characteristics yield a probability almost 75% for the existence of a dynamically stable habitable zone, where an Earth-like planet may exist and sustain life.[9]

The HD 13931 planetary system[6]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥ 1.88±0.15 MJ 5.15±0.29 4,218±388 0.02±0.05 — —

See also
  • List of extrasolar planets

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy & Astrophysics, 355: L27–L30, Bibcode:2000A&A...355L..27H.
  3. Grenier, S.; Baylac, M.-O.; Rolland, L.; Burnage, R.; Arenou, F.; Briot, D.; Delmas, F.; Duflot, M.; Genty, V.; Gómez, A. E.; Halbwachs, J.-L.; Marouard, M.; Oblak, E.; Sellier, A. (1999). "Radial velocities. Measurements of 2800 B2-F5 stars for HIPPARCOS" (PDF). Astronomy and Astrophysics Supplement. 137 (3): 451. Bibcode:1999A&AS..137..451G. doi:10.1051/aas:1999489.
  4. Database entry, VizieR Online Data Catalog: The USNO-B1.0 Catalog (Monet+ 2003), D. G. Monet et al., CDS ID I/284 Accessed on line 2018-11-06.
  5. Cutri, R. M.; Skrutskie, M. F.; Van Dyk, S.; et al. (June 2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues (2246): II/246. Bibcode:2003yCat.2246....0C.
  6. Howard, Andrew W.; et al. (2010). "The California Planet Survey. I. Four New Giant Exoplanets". The Astrophysical Journal. 721 (2): 1467–1481. arXiv:1003.3488. Bibcode:2010ApJ...721.1467H. doi:10.1088/0004-637X/721/2/1467.
  7. Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951.
  8. "HD 13931". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-11-14.
  9. Agnew, Matthew T.; Maddison, Sarah T.; Horner, Jonathan (2018). "Properties of the single Jovian planet population and the pursuit of Solar system analogues". Monthly Notices of the Royal Astronomical Society. 477 (3): 3646. arXiv:1804.06547. Bibcode:2018MNRAS.477.3646A. doi:10.1093/mnras/sty868.

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