Astronomy:HD 189567

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Short description: Star in the constellation Pavo
HD 189567
Location of HD 189567 (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Pavo[1]
Right ascension  20h 05m 32.76549s[2]
Declination −67° 19′ 15.2261″[2]
Apparent magnitude (V) 6.07[3]
Characteristics
Evolutionary stage Main sequence
Spectral type G3V[3]
Apparent magnitude (U) 6.79[4]
Apparent magnitude (B) 6.71[3]
Apparent magnitude (V) 6.07[3]
Apparent magnitude (J) 5.108±0.266[5]
Apparent magnitude (H) 4.724±0.076[5]
Apparent magnitude (K) 4.511±0.026[5]
Astrometry
Radial velocity (Rv)−10.548±0.0003[6] km/s
Proper motion (μ) RA: 845.252±0.016[2] mas/yr
Dec.: −674.213±0.024[2] mas/yr
Parallax (π)55.7654 ± 0.0245[2] mas
Distance58.49 ± 0.03 ly
(17.932 ± 0.008 pc)
Absolute magnitude (MV)4.75[3]
Details
Mass0.83±0.01[3] M☉
Radius1.1[2] R☉
Luminosity2.11[3] L☉
Surface gravity (log g)4.41±0.01[3] cgs
Temperature5,726±15[3] K
Metallicity [Fe/H]−0.24±0.01[3] dex
Rotation38.8 days[3]
Rotational velocity (v sin i)2.0[7] km/s
Age11.0±0.5 Gyr[3]
7.23±2.99 Gyr[8]
4.11[9] Gyr
Other designations
CD−67 2385, CPD−67 3703, GJ 776, HD 189567, HIP 98959, HR 7644, SAO 254721, PPM 364390, Ci 20 1180, LFT 1512, LHS 484, LPM 720, LTT 7928, NLTT 48618, PLX 4738, PM 20006-6727, TYC 9098-1638-1, GSC 09098-01638, IRAS 20006-6727, 2MASS J20053286-6719156[4]
Database references
SIMBADdata

HD 189567 is a star with a pair of orbiting exoplanets, located in the southern constellation of Pavo. It is also known as Gliese 776, CD-67 2385, and HR 7644. The star has an apparent visual magnitude of 6.07,[3] which is bright enough for it to be dimly visible to the naked eye. It lies at a distance of 58 light years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −10.5 km/s.[6]

The spectrum of HD 189567 presents as an ordinary G-type main-sequence star with a stellar classification of G3V.[3] It has 83%[3] of the mass of the Sun but 110% of the Sun's radius.[2] The star is moderately depleted in heavy elements, having 55% of the solar abundance of iron,[10] but is less depleted in oxygen, having 80% of its solar abundance.[11] It has a low level of magnetic activity in its chromosphere.[3] Age estimates range from 4.11 Gyr based on chromospheric heating to 11.26 Gyr from stellar rotation.[9] The star is radiating 2.1 times the luminosity of the Sun from its photosphere at an effective temperature of 5,726 K.[3]

Planetary system

One exoplanet was discovered around the star in 2011, HD 189567 b.[12] This exoplanet has an estimated minimum mass of 8.5 Earth masses, which means that it is most likely a mini-Neptune.[13] It has an orbital period of 14.3 days, placing it well interior to the habitable zone of the star system.[14] The planet's existence was confirmed in 2021, along with the discovery of a second planet, HD 189567 c.[3]

The HD 189567 planetary system[3]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b ≥8.5±0.6 M⊕ 0.111±0.002 14.288±0.002 <0.189 — —
c ≥7.0±0.9 M⊕ 0.197±0.003 33.688±0.025 0.16±0.09 — —

References

  1. ↑ Staff (2 August 2008). "Finding the constellation which contains given sky coordinates". DJM.cc. http://djm.cc/constellation.html. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 Unger, N. et al. (2021). "The HARPS search for southern extra-solar planets. XLVI. 12 super-Earths around the solar type stars HD 39194, HD 93385, HD 96700, HD 154088, and HD 189567". Astronomy & Astrophysics 654: A104. doi:10.1051/0004-6361/202141351. Bibcode: 2021A&A...654A.104U. 
  4. ↑ 4.0 4.1 "HD 189567". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+189567. 
  5. ↑ 5.0 5.1 5.2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  6. ↑ 6.0 6.1 Soubiran, C. et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics 616: A7. doi:10.1051/0004-6361/201832795. Bibcode: 2018A&A...616A...7S. 
  7. ↑ Llorente de Andrés, F. et al. (October 2021). "The evolution of lithium in FGK dwarf stars". Astronomy & Astrophysics 654: A137. doi:10.1051/0004-6361/202141339. ISSN 0004-6361. Bibcode: 2021A&A...654A.137L. 
  8. ↑ Pace, G. (March 2013). "Chromospheric activity as age indicator. An L-shaped chromospheric-activity versus age diagram". Astronomy & Astrophysics 551: 4. doi:10.1051/0004-6361/201220364. L8. Bibcode: 2013A&A...551L...8P. 
  9. ↑ 9.0 9.1 Vican, Laura (June 2012). "Age Determination for 346 Nearby Stars in the Herschel DEBRIS Survey". The Astronomical Journal 143 (6): 135. doi:10.1088/0004-6256/143/6/135. Bibcode: 2012AJ....143..135V. 
  10. ↑ Giribaldi, R. E. et al. (2019). "Faint solar analogues at the limit of no reddening". Astronomy & Astrophysics 629: A33. doi:10.1051/0004-6361/201935901. 
  11. ↑ Nissen, P. E. et al. (2020). "High-precision abundances of elements in solar-type stars". Astronomy & Astrophysics 640: A81. doi:10.1051/0004-6361/202038300. Bibcode: 2020A&A...640A..81N. 
  12. ↑ "The HARPS search for southern extra-solar planets XXXIV. Occurrence, mass distribution and orbital properties of super-Earths and Neptune-mass planets". 12 September 2011. arXiv:1109.2497 [astro-ph].
  13. ↑ "The Habitable Exoplanets Catalog - Planetary Habitability Laboratory @ UPR Arecibo". http://phl.upr.edu/projects/habitable-exoplanets-catalog. 
  14. ↑ "HD 189567 b". Extrasolar Planets Encyclopaedia. https://exoplanet.eu/catalog/hd_189567_b--973/. 



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