HD 147018

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HD 147018
Observation data
Epoch J2000      Equinox J2000
Constellation Triangulum Australe[1]
Right ascension 16h 23m 00.14788s[2]
Declination −61° 41′ 19.5599″[2]
Apparent magnitude (V) 8.30[1]
Characteristics
Evolutionary stage main sequence[2]
Spectral type G8/K0V[3]
Apparent magnitude (B) 9.063[1]
Apparent magnitude (J) 6.963±0.023[1]
Apparent magnitude (H) 6.640±0.044[1]
Apparent magnitude (K) 6.571±0.021[1]
B−V color index 0.763±0.002[1]
Astrometry
Radial velocity (Rv)−27.5±0.3[1] km/s
Proper motion (μ) RA: −177.896[2] mas/yr
Dec.: −316.435[2] mas/yr
Parallax (π)24.7763±0.0217 mas[2]
Distance131.6 ± 0.1 ly
(40.36 ± 0.04 pc)
Absolute magnitude (MV)5.14[1]
Details
Mass0.96±0.12[4] M☉
Radius0.93±0.04[4] R☉
Luminosity0.71±0.02[4] L☉
Surface gravity (log g)4.48±0.08[4] cgs
Temperature5,489±110 K
Metallicity [Fe/H]0.10±0.05[5] dex
Rotation31.1 days[6]
Rotational velocity (v sin i)1.56[5] km/s
Age6.36±4.33[5] Gyr
Other designations
CD−61°5387, CPD−61°5655, HIP 80250, SAO 253526, LTT 6522, NLTT 42574[7]
Database references
SIMBADdata
Exoplanet Archivedata

HD 147018 is a star in the southern constellation of Triangulum Australe.[7] It has a yellow-orange hue with an apparent visual magnitude of 8.30,[1] which is too faint to be seen with the naked eye but can be viewed with a small telescope. The star is located at a distance of 132 light years from the Sun based on parallax,[2] but is drifting closer with a radial velocity of −27.5 km/s.[1]

The stellar classification of HD 147018 is G8/K0V[3] or G9V,[5] matching a late G-type main-sequence star that is generating energy through core hydrogen fusion. It is roughly six billion years old and is spinning with a projected rotational velocity of 1.56 km/s. The star has 96% of the mass of the Sun and 93% of the Sun's radius.[4] The metallicity, or abundance of heavier elements, is higher than in the Sun.[5] The star is radiating 71% of the luminosity of the Sun from its photosphere at an effective temperature of 5,489 K.[4]

In August 2009, two extrasolar planets, HD 147018 b and HD 147018 c, were reported to be orbiting this star. The planets were found using the radial velocity method, using the CORALIE spectrograph at La Silla Observatory, Chile.[5]

The HD 147018 planetary system[5]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b ≥2.12±0.07 MJ 0.2388±0.0039 44.236±0.008 0.4686±0.0081 — —
c ≥6.56±0.32 MJ 1.922±0.039 1,008±18 0.133±0.011 — —

See also

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References

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  1. ^ a b c d e f g h i j k Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
  2. ^ a b c d e f g Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. ^ a b Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  4. ^ a b c d e f Stassun, Keivan G.; et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467.
  5. ^ a b c d e f g Segransan, D.; et al. (February 2010), "The CORALIE survey for southern extrasolar planets. XVI. Discovery of a planetary system around HD 147018 and of two long period and massive planets orbiting HD 171238 and HD 204313", Astronomy and Astrophysics, 511: 6, arXiv:0908.1479, Bibcode:2010A&A...511A..45S, doi:10.1051/0004-6361/200912136, S2CID 8864844, A45
  6. ^ Cruz Aguirre, Fernando; Youngblood, Allison; France, Kevin; Bourrier, Vincent (2023). "Disentangling Stellar and Airglow Emission Lines from Hubble Space Telescope (HST) Cosmic Origins Spectrograph (COS) Spectra". The Astrophysical Journal. 946 (2): 98. Bibcode:2023ApJ...946...98C. doi:10.3847/1538-4357/acad7d.
  7. ^ a b "HD 147018". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-12-12.