HD 129445

Last updated
HD 129445
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Circinus
Right ascension 14h 46m 03.06521s [1]
Declination –68° 45′ 45.8797″ [1]
Apparent magnitude  (V)8.80 [2]
Characteristics
Spectral type G6 V [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  mas/yr [1]
Dec.: –57.069  mas/yr [1]
Parallax (π)14.9136 ± 0.0147  mas [1]
Distance 218.7 ± 0.2  ly
(67.05 ± 0.07  pc)
Absolute magnitude  (MV)4.73 [2]
Details [4]
Mass 1.06+0.03
−0.05  M☉
Radius 1.18±0.01 [5]   R☉
Luminosity 1.229+0.005
−0.004 [5]   L☉
Surface gravity (log g)4.39±0.08  cgs
Temperature 5,605+21
−34 [5]   K
Metallicity [Fe/H]0.36±0.10  dex
Rotational velocity (v sin i)1.4 [6]  km/s
Age 4.94+3.77
−2.04  Gyr
Other designations
CD–68°1403, HD  129445, HIP  72203, PPM  360965, LTT  5856, NLTT  38236 [7]
Database references
SIMBAD data
Exoplanet Archive data

HD 129445 (HIP 72203; LTT 5856) is a star located in the southern constellation Circinus. It has an apparent magnitude of 8.80, [2] making it faintly visble in binoculars but not to the naked eye. The object is located relatively close at a distance of 219 light-years based on Gaia DR3 parallax measurements but it is drifting away with a spectroscopic radial velocity of 8.56  km/s . [1] It has an absolute magnitude of +4.73, [2] which is similar to the Sun's absolute magnitude of 4.83.

Contents

Physical characteristics

HD 129445 has a stellar classification of G6 V, [3] indicating that it is an ordinary G-type main-sequence star like our Sun, albeit a bit cooler. It has 106% the mass of the Sun [4] and 118% the radius of the Sun. [5] It radiates 1.23 times the luminosity of the Sun from its photosphere at an effective temperature of 5,605  K , [5] giving it a yellow hue when viewed in the night sky. HD 129445 is extremely metal enriched with an iron abundance more than twice of that of the Sun's [4] and it spins slowly with a projected rotational velocity of 1.4  km/s . [6] It is slightly older than the Sun at the age of 4.94 billion years. [4]

Planetary system

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

Related Research Articles

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HD 190228 is a star with an orbiting substellar companion in the northern constellation of Vulpecula. Its apparent magnitude is 7.30 – too faint to be seen with the naked eye – and the absolute magnitude is 3.34. Based on parallax measurements, it is located at a distance of 205 light-years from the Sun. The system is drifting closer with a radial velocity of −50 km/s.

HD 196050 is a triple star system located in the southern constellation of Pavo. This system has an apparent magnitude of 7.50 and the absolute magnitude is 4.01. It is located at a distance of 165 light-years from the Sun based on parallax, and is drifting further away with a radial velocity of +61 km/s. It is also called by the Hipparcos designation HIP 101806.

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HD 171238 is a star with an orbiting exoplanet in the southern constellation of Sagittarius. It is located at a distance of 145 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of 21 km/s. The star has an absolute magnitude of 5.15, but at the distance of this system it is too faint to be viewed with the naked eye, having an apparent visual magnitude of 8.61.

HD 181720 is star with an orbiting substellar companion in the southern constellation of Sagittarius. It is located at a distance of 196 light years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −45.4 km/s. The star has an absolute magnitude of 4.10, but at that distance it has an apparent visual magnitude of 7.84, which is too faint to be seen with the naked eye. It shows a high proper motion, traversing the celestial sphere at an angular rate of 0.444 arcsec yr−1.

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HD 86226 is a star with a pair of orbiting exoplanet companions, found in the constellation of Hydra. With an apparent visual magnitude of 7.93, it is too dim to be visible with the naked eye. The distance to this system has been determined by the parallax method, yielding a range of 149 light years. It is receding with a heliocentric radial velocity of +19.6 km/s. A survey in 2015 has ruled out the existence of any stellar companions at projected distances above 12 astronomical units.

HD 152079 is a star with an orbiting exoplanet in the southern constellation of Ara. It is located at a distance of 287 light years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −21 km/s. At that distance the star is much too faint to be visible with the naked eye, having an apparent visual magnitude of 9.18.

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HD 175167 is a star with an exoplanet companion in the southern constellation of Pavo. It is too faint to be visible with the naked eye at an apparent visual magnitude of 8.01. The system is located at a distance of 232 light-years from the Sun based on parallax measurements, and it is drifting further away with a radial velocity of 5 km/s. It shows a high proper motion, traversing the celestial sphere at an angular rate of 0.190 arcsec yr−1.

HD 175167 b is an exoplanet orbiting HD 175167, which is a G type star within the Pavo constellation 232 light-years away from the Earth. The planet was discovered by the Magellan Planet Search Program as the astronomical object fit the Keplerian orbital model. During the observations 13 doppler velocity tests were conducted, which showed this object's mass was at least 7.8 Jovian-masses and its orbit has a high eccentricity. The exoplanet takes 3.53 years to complete a full stellar orbit.

HD 220689 is a single star in the equatorial constellation of Aquarius. It is a challenge to view with the naked eye, having an apparent visual magnitude of +7.74, but is readily viewed with a pair of binoculars. The star is located at a distance of 153 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +12 km/s. A survey in 2015 has ruled out the existence of any additional stellar companions at projected distances from 26 to 305 astronomical units.

References

  1. 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.
  2. 1 2 3 4 5 6 7 8 9 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. S2CID   119257644.
  3. 1 2 Houk, Nancy (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 1. Ann Arbor, Michigan: Department of Astronomy, University of Michigan. Bibcode:1978mcts.book.....H.
  4. 1 2 3 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. arXiv: 1803.05922 . Bibcode:2018A&A...614A..55A. doi:10.1051/0004-6361/201732209. S2CID   62799777. A55.
  5. 1 2 3 4 5 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics . 616. A1. arXiv: 1804.09365 . Bibcode: 2018A&A...616A...1G . doi: 10.1051/0004-6361/201833051 . Gaia DR2 record for this source at VizieR.
  6. 1 2 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. arXiv: 1103.0584 . Bibcode:2011A&A...531A...8J. doi:10.1051/0004-6361/201016333. S2CID   55800969. A8.
  7. ↑ "HD 129445". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2021-03-22.
  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. arXiv: 1001.4093 . Bibcode:2010ApJ...711.1229A. doi:10.1088/0004-637X/711/2/1229. S2CID   118682009.
  9. ↑ "Estrella del Anfitrión: HD 129445". Planet Quest. Archived from the original on 2010-07-04. Retrieved 2010-02-12.
  10. ↑ "HD 129445". Exoplanets. Archived from the original on 2010-03-17. Retrieved 2010-02-12.
  11. 1 2 Xiao, Guang-Yao; Liu, Yu-Juan; et al. (May 2023). "The Masses of a Sample of Radial-Velocity Exoplanets with Astrometric Measurements". Research in Astronomy and Astrophysics . 23 (5): 055022. arXiv: 2303.12409 . Bibcode:2023RAA....23e5022X. doi:10.1088/1674-4527/accb7e.
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