HD 147018

HD 147018 is a G-type main sequence star in the constellation of Triangulum Australe.[2] It has an apparent visual magnitude of approximately 8.4.[2] 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.[6]

The HD 147018 planetary system[7]

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	1008 ± 18	0.133 ± 0.011	—	—

HD 147018

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Triangulum Australe
Right ascension	16^h 23^m 00.1470^s[1]
Declination	−61° 41′ 19.5629″[1]
Apparent magnitude (V)	8.4[2]
Characteristics
Spectral type	G9V[2]
Apparent magnitude (B)	9.0[2]
Apparent magnitude (J)	6.963[2]
Apparent magnitude (H)	6.640[2]
Apparent magnitude (K)	6.571[2]
B−V color index	0.6[2]
Astrometry
Radial velocity (Rv)	−27.9 ± 0.2[2] km/s
Proper motion (μ)	RA: −177.498±0.060[1] mas/yr Dec.: −316.244±0.057[1] mas/yr
Parallax (π)	24.7079 ± 0.0434[1] mas
Distance	132.0 ± 0.2 ly (40.47 ± 0.07 pc)
Absolute magnitude (MV)	5.14[3]
Details
Mass	0.88 (0.86 to 0.95)[4] M☉
Temperature	5,400[5] K
Metallicity [Fe/H]	0.06[5] dex
Rotational velocity (v sin i)	0[4] km/s
Age	12.6 (6.0 to 16.6)[5] Gyr
Other designations
CD−61°5387, CPD−61°5655, HIP 80250, SAO 253526, LTT 6522, NLTT 42574[2]
Database references
SIMBAD	data
Exoplanet Archive	data

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. LTT 6522 -- High proper-motion Star, database entry, SIMBAD. Accessed on line August 26, 2009.
3. 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.
4. HD 147018, database entry, The Geneva-Copenhagen Survey of Solar neighbourhood, J. Holmberg et al., 2007, CDS ID V/117A. Accessed on line August 26, 2009.
5. HD 147018, database entry, The Geneva-Copenhagen Survey of the Solar neighbourhood III, J. Holmberg et al., 2009, CDS ID V/130. Accessed on line August 26, 2009.
6. 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, D. Segransan, S. Udry, M. Mayor, D. Naef, F. Pepe, D. Queloz, N.C. Santos, B-O. Demory, P. Figueira, M. Gillon, M. Marmier, D. Megevand, D. Sosnowska, O. Tamuz, and A. H.M.J. Triaud, arXiv:0908.1479v1, August 11, 2009.
7. Star : HD 147018, entry, Extrasolar Planets Encyclopaedia. Accessed on line September 16, 2009.