Astronomy:HD 156411

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Star in the constellation Ara
HD 156411
Observation data
Equinox J2000.0]] (ICRS)
Constellation Ara
Right ascension  17h 19m 51.40032s[1]
Declination –48° 32′ 57.5538″[1]
Apparent magnitude (V) 6.67[2]
Spectral type G1V(w)[3]
Apparent magnitude (B) 7.284[2]
Apparent magnitude (J) 5.563±0.018[2]
Apparent magnitude (H) 5.241±0.031[2]
Apparent magnitude (K) 5.170±0.021[2]
B−V color index 0.614±0.008[2]
Radial velocity (Rv)−38.76±0.18[1] km/s
Proper motion (μ) RA: −33.184[1] mas/yr
Dec.: −211.549[1] mas/yr
Parallax (π)17.5567 ± 0.0559[1] mas
Distance185.8 ± 0.6 ly
(57.0 ± 0.2 pc)
Absolute magnitude (MV)2.976[4]
Mass1.24±0.03 M
Radius2.15±0.11 R
Luminosity5.38[4] L
Surface gravity (log g)4.03±0.03 cgs
Temperature5,908±16 K
Metallicity [Fe/H]−0.12±0.02 dex
Rotational velocity (v sin i)1.84±0.23 km/s
Age4.28±0.42 Gyr
Other designations
Inquill, CD–48°11605, HD 156411, HIP 84787, SAO 227825, PPM 322823, NLTT 44550[6]
Database references
Exoplanet Archivedata
Extrasolar Planets

HD 156411 is a 7th magnitude G-type main-sequence star located approximately 186 light years away in the southern constellation Ara. This star is larger, hotter, brighter, and more massive than our Sun. Its metal content is three-fourths as much as the Sun. The star is around 4.3 billion years old and is spinning with a projected rotational velocity of 1.8 km/s.[5] Naef and associates (2010) noted the star appears to be slightly evolved,[4] and thus may be in the process of leaving the main sequence. In 2009, a gas giant planet was found in orbit around the star.[4]

The star HD 156411 is named Inquill. The name was selected in the NameExoWorlds campaign by Peru, during the 100th anniversary of the IAU. Inquil was one half of the couple involved in the tragic love story Way to the Sun by Abraham Valdelomar.[7][8]

The HD 156411 planetary system[4]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b 0.74+0.05
842.2±14.5 0.22±0.08

See also

  • List of extrasolar planets


  1. 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. 2.0 2.1 2.2 2.3 2.4 2.5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode2012AstL...38..331A. 
  3. Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. 2. Ann Arbor: Dept. of Astronomy, University of Michigan. 
  4. 4.0 4.1 4.2 4.3 4.4 Naef, D. et al. (2010). "The HARPS search for southern extrasolar planets XXIII. 8 planetary companions to low-activity solar-type stars". Astronomy and Astrophysics 523: A15. doi:10.1051/0004-6361/200913616. Bibcode2010A&A...523A..15N. 
  5. 5.0 5.1 Jofré, E. et al. (2015). "Stellar parameters and chemical abundances of 223 evolved stars with and without planets". Astronomy & Astrophysics 574: A50. doi:10.1051/0004-6361/201424474. Bibcode2015A&A...574A..50J. 
  6. "HD 156411". SIMBAD. Centre de données astronomiques de Strasbourg. 
  7. "Approved names" (in en). International Astronomical Union. 
  8. "International Astronomical Union | IAU". 

Coordinates: Sky map 17h 19m 51.3992s, −48° 32′ 57.548″