HD 147018

HD 147018
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Triangulum Australe
Right ascension 16h 23m 00.14702s[1]
Declination −61° 41′ 19.5629″[1]
Apparent magnitude (V) 8.30[2]
Characteristics
Spectral type G8/K0V[3]
Apparent magnitude (B) 9.063[2]
Apparent magnitude (J) 6.963±0.023[2]
Apparent magnitude (H) 6.640±0.044[2]
Apparent magnitude (K) 6.571±0.021[2]
B−V color index 0.763±0.002[2]
Astrometry
Radial velocity (Rv)−27.5±0.3[2] km/s
Proper motion (μ) RA: −177.498[1] mas/yr
Dec.: −316.244[1] mas/yr
Parallax (π)24.7079 ± 0.0434 mas[1]
Distance132.0 ± 0.2 ly
(40.47 ± 0.07 pc)
Absolute magnitude (MV)5.14[2]
Details[4]
Mass0.927±0.031 M☉
Radius0.94±0.02[1] R☉
Luminosity0.712±0.002[1] L☉
Surface gravity (log g)4.38±0.16 cgs
Temperature5,441±55 K
Metallicity [Fe/H]0.10±0.05 dex
Rotational velocity (v sin i)1.56 km/s
Age6.36±4.33 Gyr
Other designations
CD−61°5387, CPD−61°5655, HIP 80250, SAO 253526, LTT 6522, NLTT 42574[5]
Database references
SIMBADdata
Exoplanet Archivedata

HD 147018 is a star in the southern constellation of Triangulum Australe.[5] It has a yellow-orange hue with an apparent visual magnitude of 8.30,[2] 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,[1] but is drifting closer with a radial velocity of −27.5 km/s.[2]

The stellar classification of HD 147018 is G8/K0V[3] or G9V,[4] 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 93%[4] of the mass of the Sun and 94%[1] of the Sun's radius. The metallicity, or abundance of heavier elements, is higher than in the Sun.[4] The star is radiating 71%[1] of the luminosity of the Sun from its photosphere at an effective temperature of 5,441 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.[4]

The HD 147018 planetary system[4]
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

References

  1. ^ a b c d e f g h i j 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. ^ a b c d e f g h i j 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, S2CID 119257644.
  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 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
  5. ^ a b "HD 147018". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-12-12.