HD 143361

Last updated
HD 143361
Observation data
Epoch J2000       Equinox J2000
Constellation Norma
Right ascension 16h 01m 50.34828s [1]
Declination −44° 26 04.3434 [1]
Apparent magnitude  (V)9.20 [2]
Characteristics
Spectral type G6 V [3]
Apparent magnitude  (B)~9.93 [4]
Apparent magnitude  (V)~9.16 [4]
Apparent magnitude  (J)7.905 ± 0.026 [5]
Apparent magnitude  (H)7.572 ± 0.038 [5]
Apparent magnitude  (K)7.488 ±0.018 [5]
B−V color index 0.773 [2]
Astrometry
Radial velocity (Rv)−0.56±0.16 [1]  km/s
Proper motion (μ)RA: −156.561  mas/yr [1]
Dec.: −120.231  mas/yr [1]
Parallax (π)14.5456 ± 0.0202  mas [1]
Distance 224.2 ± 0.3  ly
(68.75 ± 0.10  pc)
Details
Mass 0.93 [6]   M
Temperature 5,420 [7]   K
Metallicity [Fe/H]0.06 [2]   dex
Age 8.1 [7]   Gyr
Other designations
CD–44 10569, HD  143361, HIP  78521, SAO  226454.
Database references
SIMBAD data

HD 143361 is a star in the southern constellation Norma. With an apparent visual magnitude of 9.20, [2] this star is too dim to be seen with the naked eye. It is close enough to the Earth that its distance can be determined using parallax measurements, yielding a value of 224 light-years (69 parsecs ). [1]

Contents

This is a G-type main sequence star with a stellar classification of G6 V. [3] It has around 95% of the Sun's mass and is around 8.1 [7] billion years old.

HD 143361 may be a binary star, a red dwarf star has a similar distance and similar proper motions with the primary. If gravitationally bound to HD 143361, the orbit is very wide, as the angular separation of 33 arcminutes translates to a projected separation of 135,000  AU (2.13 light-years). [8]

Planetary system

In October 2008 the exoplanet HD 143361 b was reported to be orbiting this star. This object was detected using the radial velocity method during an astronomical survey conducted by the Magellan Planet Search Program using the MIKE echelle spectrograph on the 6.5-m Magellan II (Clay) telescope. [6] In 2023, the inclination and true mass of HD 143361 b were determined via astrometry. [9]

The HD 143361 planetary system [9]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(years)
Eccentricity Inclination Radius
b 4.35+1.2
−0.66
  MJ
1.994±0.0182.8538+0.0031
−0.003
0.1938+0.0047
−0.0046
55+22
−15
or 125+15
−22
°

See also

Related Research Articles

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References

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  9. 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.