HD 147018

HD 147018
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Triangulum Australe
Right ascension 16h 23m 00.1463s[1]
Declination −61° 41′ 19.542″[1]
Apparent magnitude (V) 8.4[1]
Characteristics
Spectral type G9V[1]
Apparent magnitude (B) 9.0[1]
Apparent magnitude (J) 6.963[1]
Apparent magnitude (H) 6.640[1]
Apparent magnitude (K) 6.571[1]
B−V color index 0.6[1]
Astrometry
Radial velocity (Rv) −27.9 ± 0.2[1] km/s
Proper motion (μ) RA: −178.50[1] mas/yr
Dec.: −315.21[1] mas/yr
Parallax (π) 23.43 ± 0.95[1] mas
Distance 139 ± 6 ly
(43 ± 2 pc)
Absolute magnitude (MV) 5.25[2]
Details
Mass 0.88 (0.86 to 0.95)[3] M☉
Temperature 5400[4] K
Metallicity [Fe/H] = 0.06[4]
Rotational velocity (v sin i) 0[3] km/s
Age 12.6 (6.0 to 16.6) × 109[4] years
Other designations
CD−61 5387, CPD−61 5655, HIP 80250, LTT 6522, NLTT 42574, PPM 362039, SAO 253526.[1]
Database references
SIMBAD data
NStED data
Extrasolar Planets
Encyclopaedia		 data

HD 147018 is a G-type main sequence star in the constellation of Triangulum Australe.[1] It has an apparent visual magnitude of approximately 8.4.[1] 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 system[6]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity
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

See also

References

  1. ^ a b c d e f g h i j k l m n o p LTT 6522 -- High proper-motion Star, database entry, SIMBAD. Accessed on line August 26, 2009.
  2. ^ From apparent magnitude and parallax.
  3. ^ a b 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.
  4. ^ a b c 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.
  5. ^ 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.
  6. ^ Star : HD 147018, entry, Extrasolar Planets Encyclopaedia. Accessed on line September 16, 2009.

Coordinates: 16h 23m 00.1463s, −61° 41′ 19.542″