HD 147018

HD 147018
Observation data; Epoch J2000 Equinox ICRS
Constellation	Triangulum Australe
Right ascension	16h 23m 00.14788s
Declination	−61° 41′ 19.5599″
Apparent magnitude (V)	8.30
Characteristics
Evolutionary stage	main sequence
Spectral type	G8/K0V
Apparent magnitude (B)	9.063
Apparent magnitude (J)	6.963±0.023
Apparent magnitude (H)	6.640±0.044
Apparent magnitude (K)	6.571±0.021
B−V color index	0.763±0.002
Astrometry
Radial velocity (Rv)	−27.5±0.3 km/s
Proper motion (μ)	RA: −177.896 mas/yr ; Dec.: −316.435 mas/yr
Parallax (π)	24.7763±0.0217 mas
Distance	131.6 ± 0.1 ly ; (40.36 ± 0.04 pc)
Absolute magnitude (MV)	5.14
Details
Mass	0.96±0.12 M☉
Radius	0.93±0.04 R☉
Luminosity	0.71±0.02 L☉
Surface gravity (log g)	4.48±0.08 cgs
Temperature	5,489±110 K
Metallicity [Fe/H]	0.10±0.05 dex
Rotation	31.1 days
Rotational velocity (v sin i)	1.56 km/s
Age	6.36±4.33 Gyr
Other designations
	CD−61°5387, CPD−61°5655, HIP 80250, SAO 253526, LTT 6522, NLTT 42574
Database references
SIMBAD	data
Exoplanet Archive	data

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

The stellar classification of HD 147018 is G8/K0V or G9V, 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. The metallicity, or abundance of heavier elements, is higher than in the Sun. The star is radiating 71% of the luminosity of the Sun from its photosphere at an effective temperature of 5,489 K.

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.

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

References

1 2 3 4 5 6 7 8 9 10 11 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.
1 2 3 4 5 6 7 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.
1 2 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.
1 2 3 4 5 6 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.
1 2 3 4 5 6 7 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
↑ 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.
1 2 "HD 147018". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-12-12.

[Anderson2012-1] 1 2 3 4 5 6 7 8 9 10 11 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.

[Gaia_DR3-2] 1 2 3 4 5 6 7 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.

[Houk_Cowley_1979-3] 1 2 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.

[tic-4] 1 2 3 4 5 6 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.

[Segransan_et_al_2009-5] 1 2 3 4 5 6 7 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

[ca2023-6] 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.

[SIMBAD-7] 1 2 "HD 147018". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-12-12.

HD 147018

See also

References