HD 23127

HD 23127
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Reticulum
Right ascension 03h 39m 23.63799s[1]
Declination −60° 04′ 40.2386″[1]
Apparent magnitude (V) +8.576±0.002[2]
Characteristics
Spectral type G2V[3]
B−V color index 0.701±0.013[2]
Astrometry
Radial velocity (Rv)+21.9±1.7[4] km/s
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 mas[1]
Distance306.9 ± 0.7 ly
(94.1 ± 0.2 pc)
Absolute magnitude (MV)3.62[4]
Details[2]
Mass1.208±0.045 M
Radius1.490±0.104 R
Luminosity3.01±0.03[5] L
Surface gravity (log g)4.146±0.054 cgs
Temperature5,843±52 K
Metallicity [Fe/H]0.29±0.03 dex
Rotation~33 days
Age4.508±0.788 Gyr
Other designations
CD−60°762, HD 23127, HIP 17054, SAO 248860, TYC 8867-913-1, GSC 08867-00913[6]
Database references
SIMBADdata

HD 23127 is a star in the southern constellation of Reticulum. With an apparent visual magnitude of +8.58[4] it is not visible to the naked eye, but can be viewed with a good pair of binoculars. The star is located at a distance of 307 light years from the Sun based on parallax, and is drifting further away with a radial velocity of ~22 km/s.[4] It has an absolute magnitude of 3.62.[4]

This is a G-type main-sequence star with a stellar classification of G2V,[3] which means it is generating energy through core hydrogen fusion. HD 23127 is more massive than the Sun at 1.21 solar masses and has a 49% larger radius. It is metal-rich, having nearly double the abundance of iron in its atmosphere compared to the Sun. This star has an age of 4.5 billion years;[2] about the same as the Sun.

On Friday, February 9, 2007, a 3.32 years period jovian planet was found by using the wobble method by O'Toole and colleagues in Australia.[7] It has minimum mass 53% greater than Jupiter and orbits with a 41% eccentricity. The maximum stable period for a hypothetical inner planet is 322.1 days.[2]

The HD 23127 planetary system[2]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b ≥1.527+0.037
−0.038
 MJ
2.370±0.032 1,211.17+11.11
−8.91
0.406+0.083
−0.09
  1. ^ a b c d e Cite error: The named reference Gaia DR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference Barbato_et_al_2018 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1979 was invoked but never defined (see the help page).
  4. ^ a b c d e Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Bonfanti2015 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference O'Toole2007 was invoked but never defined (see the help page).