Astronomy:HD 129445

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Short description: Star in the constellation Circinus
HD 129445
Observation data
Equinox J2000.0]] (ICRS)
Constellation Circinus
Right ascension  14h 46m 03.06521s[1]
Declination –68° 45′ 45.8797″[1]
Apparent magnitude (V) 8.80[2]
Characteristics
Spectral type G6V[3]
Apparent magnitude (B) 9.556[2]
Apparent magnitude (J) 7.531±0.023[2]
Apparent magnitude (H) 7.243±0.027[2]
Apparent magnitude (K) 7.167±0.026[2]
B−V color index 0.756±0.002[2]
Astrometry
Radial velocity (Rv)+8.56±0.13[1] km/s
Proper motion (μ) RA: –197.892[1] mas/yr
Dec.: –57.069[1] mas/yr
Parallax (π)14.9136 ± 0.0147[1] mas
Distance218.7 ± 0.2 ly
(67.05 ± 0.07 pc)
Absolute magnitude (MV)4.73[2]
Details[4]
Mass1.06+0.03
−0.05 M☉
Radius1.18±0.01[5] R☉
Luminosity1.229+0.005
−0.004[5] L☉
Surface gravity (log g)4.39±0.08 cgs
Temperature5,605+21
−34[5] K
Metallicity [Fe/H]0.36±0.10 dex
Rotational velocity (v sin i)1.4[6] km/s
Age4.94+3.77
−2.04 Gyr
Other designations
CD–68°1403, HD 129445, HIP 72203, PPM 360965, LTT 5856, NLTT 38236[7]
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data
Yellow dwarf.jpg

HD 129445 is a G-type star found in the Circinus constellation located 219 light-years (67 parsecs) away from the Sun based on parallax.[1] It is invisible to the naked eye with an apparent visual magnitude of 8.80.[2] The star was observed by the Magellan Planet Search Program due to its absolute visual magnitude and high metallicity. The Magellan program conducted 17 doppler velocity measurements, which spans a full orbital period. The results led the program to detect a planet dubbed HD 129445 b.[8][9][10] In 2023, the inclination and true mass of HD 129445 b were determined via astrometry.[11]

The HD 129445 planetary system[11]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(years) 		Eccentricity Inclination Radius
b 2.51+1.1
−0.54 MJ 		2.984+0.039
−0.054 		4.933+0.093
−0.13 		0.572+0.087
−0.086 		52+24
−19 or 128+19
−24° 		—

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  3. ↑ Houk, Nancy (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. 1. Ann Arbor, Michigan: Department of Astronomy, University of Michigan. Bibcode: 1978mcts.book.....H. 
  4. ↑ Aguilera-Gómez, Claudia et al. (June 2018). "Lithium abundance patterns of late-F stars: an in-depth analysis of the lithium desert". Astronomy & Astrophysics 614: 15. doi:10.1051/0004-6361/201732209. A55. Bibcode: 2018A&A...614A..55A. 
  5. ↑ 5.0 5.1 5.2 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. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  6. ↑ Jenkins, J. S. et al. (July 2011). "Chromospheric activities and kinematics for solar type dwarfs and subgiants: analysis of the activity distribution and the AVR". Astronomy & Astrophysics 531: 15. doi:10.1051/0004-6361/201016333. A8. Bibcode: 2011A&A...531A...8J. 
  7. ↑ "HD 129445". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+129445. 
  8. ↑ Arriagada, Pamela et al. (2010). "Five Long-period Extrasolar Planets in Eccentric orbits from the Magellan Planet Search Program". The Astrophysical Journal 711 (2): 1229–35. doi:10.1088/0004-637X/711/2/1229. Bibcode: 2010ApJ...711.1229A. 
  9. ↑ "Estrella del Anfitrión: HD 129445". Planet Quest. http://planetquest1.jpl.nasa.gov/atlas_espanol/atlas_profile.cfm?Planet=576. 
  10. ↑ "HD 129445". Exoplanets. http://media4.obspm.fr/exoplanets/base/etoile.php?nom=HD+129445. Retrieved 2010-02-12. 
  11. ↑ 11.0 11.1 Xiao, Guang-Yao et al. (May 2023). "The Masses of a Sample of Radial-Velocity Exoplanets with Astrometric Measurements". Research in Astronomy and Astrophysics 23 (5): 055022. doi:10.1088/1674-4527/accb7e. Bibcode: 2023RAA....23e5022X. 

Coordinates: Sky map 14h 46m 03.06s, −68° 45′ 45.9″



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