HD 23127

HD 23127 is a star in the Reticulum constellation. At the distance of 307 ly, it is not visible to the naked eye, but it is visible with a good pair of binoculars.

HD 23127
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Reticulum
Right ascension  03h 39m 23.6380s[1]
Declination −60° 04′ 40.2386″[1]
Apparent magnitude (V) +8.58
Characteristics
Spectral type G2V
B−V color index 0.65
Variable type “None”
Astrometry
Proper motion (μ) RA: 73.621±0.042[1] mas/yr
Dec.: 142.847±0.045[1] mas/yr
Parallax (π)10.6258 ± 0.0232[1] mas
Distance306.9 ± 0.7 ly
(94.1 ± 0.2 pc)
Absolute magnitude (MV)3.83
Details
Mass1.26 ± 0.04[2] M☉
Radius1.71 ± 0.03[2] R☉
Luminosity3.01 ± 0.03[2] L☉
Surface gravity (log g)4.06 ± 0.02[2] cgs
Temperature5843 ± 52[2] K
Metallicity+0.34
Rotation~46.1 days
Age4.8 ± 0.6[2] Gyr
Other designations
CD−60°762, HIP 17054, SAO 248860, TYC 8867-913-1, GSC 08867-00913[3]
Database references
SIMBADdata

Star

HD 23127 is a hydrogen-fusing sun-like star with spectrum G2V. The star is more massive than our Sun at 1.13 solar mass. The star is also more metal-rich, meaning it contains two times more metals [Fe/H] than our Sun. It is older than the local star at 7 billion years, more than halfway through its life.

Planetary system

On Friday, February 9, 2007, a 1214-day period jovian planet was found by using the wobble method by O’Toole in Australia. It has minimum mass 37% greater than Jupiter and orbits in 44% eccentricity. The distance from the star ranges from 1.28 to 3.30 astronomical units with the average distance 2.29 AU.[4]

The HD 23127 planetary system[4]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b >1.5 ± 0.2 MJ 2.4 ± 0.3 1214 ± 9 0.44 ± 0.07 — —
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See also
  • List of extrasolar planets

References
  1. 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.
  2. Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951.
  3. "HD 23127". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-08-15.
  4. O'Toole, Simon J.; et al. (2007). "New Planets around Three G Dwarfs". The Astrophysical Journal. 660 (2): 1636–1641. arXiv:astro-ph/0702213. Bibcode:2007ApJ...660.1636O. doi:10.1086/513563.

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