HD 102365

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HR 4523 A/B
Observation data
Epoch J2000      Equinox J2000
Constellation Centaurus
Right ascension 11h 46m 31.07263s[1]
Declination −40° 30′ 01.2722″[1]
Apparent magnitude (V) 4.88[2]/15[3]
Characteristics
Spectral type G2V[4]/M4V[5]
U−B color index 0.10[2]
B−V color index 0.67[2]
Astrometry
Radial velocity (Rv) 15.3 ± 0.9[6] km/s
Proper motion (μ) RA: −1530.99[1] mas/yr
Dec.: 403.67[1] mas/yr
Parallax (π) 108.45 ± 0.22[1] mas
Distance 30.07 ± 0.06 ly
(9.22 ± 0.02 pc)
Details
Mass 0.889[7] M☉
Radius 0.96[7] R☉
Luminosity 0.85[8] L☉
Surface gravity (log g) 4.51[4] cgs
Temperature 5,643[8] K
Metallicity [Fe/H] −0.28[8] dex
Rotational velocity (v sin i) 0.5[9] km/s
Age 4.5–5.7[10] Gyr
Other designations
66 G. Centauri, GJ 442, HR 4523, CD -39°7301, HD 102365, LHS 311, LTT 4373, GCTP 2725.00, SAO 223020, HIP 57443.[11]
Database references
SIMBAD data
ARICNS data

HR 4523 (66 G. Centauri) is a binary star system that is located in the northeastern part of the Centaurus constellation, at a distance of about 30.07 ly (9.22 pc) from the Solar System. The larger member of the system is a G-type star that is smaller than the Sun but of similar mass. It has a common proper motion companion that was discovered by W. J. Luyten in 1960.[5] This M-type star appears to be in a wide orbit around the primary at a current separation of about 211 astronomical units (AU),[5] (or 211 times the separation of the Earth from the Sun). By comparison, Neptune orbits at an average distance of 30 AU.

The stellar classification for the primary star in this system is G2V;[4] the same as the Sun. That of the red dwarf companion is M4V.[5] The primary star has an estimated 86%[12] to 89% the mass of the Sun, 96% of the Sun's radius,[7] and 85% of the Sun's luminosity.[8] It is a slow rotator, with a projected rotational velocity of 0.5 km/s.[9] Age estimates range from 4.5–5.7 billion years (Gyr)[10] up to 7.1 Gyr[13] or 9.48 Gyr.[7] Compared to the Sun, it only has about 52%[14] of the abundance of elements other than hydrogen and helium; what astronomers term the metallicity of a star.

This star system has a relatively large proper motion.[11] The HR 4523 system is a member of the Epsilon Indi Moving Group, although it is most likely an interloper. (The star is older and has a different composition than the other group members.)[15] It has space velocity components [U, V, W] = [−67, −40, +4] km/s.[16]

Planetary system

The primary star is believed to be orbited by a Neptune-like planet with a mass 16 times that of the Earth. The orbital period of this planet is 122.1 days. No other planets have been discovered orbiting this star.[17] An examination of this system in the infrared did not reveal an excess emission that would otherwise suggest the presence of a circumstellar debris disk.[18]

The HD 102365 planetary system[19]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 0.05 ± 0.008 MJ 0.46 ± 0.04 122.1 ± 0.3 0.34 ± 0.14 — —

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ 2.0 2.1 2.2 Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ 4.0 4.1 4.2 Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ 5.0 5.1 5.2 5.3 Lua error in package.lua at line 80: module 'strict' not found. For the adopted physical separation, see Table 11 in the appendix.
  6. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  7. ↑ 7.0 7.1 7.2 7.3 Lua error in package.lua at line 80: module 'strict' not found.
  8. ↑ 8.0 8.1 8.2 8.3 Lua error in package.lua at line 80: module 'strict' not found.
  9. ↑ 9.0 9.1 Lua error in package.lua at line 80: module 'strict' not found.
  10. ↑ 10.0 10.1 Lua error in package.lua at line 80: module 'strict' not found.
  11. ↑ 11.0 11.1 Lua error in package.lua at line 80: module 'strict' not found.
  12. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  13. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  14. ↑ For a metallicity of [Fe/H] = −0.28 dex, the proportion of metals is given by 10−0.28, or 52%.
  15. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  16. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  17. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  18. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  19. ↑ Lua error in package.lua at line 80: module 'strict' not found.

External links

  • Lua error in package.lua at line 80: module 'strict' not found.
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