HIP 5158

HIP 5158
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cetus[1]
Right ascension 01h 06m 02.050s[2]
Declination –22° 27′ 11.35″[2]
Apparent magnitude (V) 10.16[1]
Characteristics
Spectral type K5V[3]
Apparent magnitude (B) 11.238[1]
B−V color index 1.078±0.001[1]
Astrometry
Radial velocity (Rv)15.28±0.23[4] km/s
Proper motion (μ) RA: 203.818±0.025 mas/yr[2]
Dec.: −106.926±0.032 mas/yr[2]
Parallax (π)19.3199 ± 0.0198 mas[2]
Distance168.8 ± 0.2 ly
(51.76 ± 0.05 pc)
Absolute magnitude (MV)7.11[1]
Details
Mass0.75±0.01[5] M☉
Radius0.69±0.02[5] R☉
Luminosity0.19±0.01[5] L☉
Surface gravity (log g)4.63±0.02[5] cgs
Temperature4,571±14[5] K
Metallicity [Fe/H]0.10±0.07[3] dex
Rotation42.3 days[3]
Age4.5±3.2[5] Gyr
Other designations
CD–23°395, HIP 5158, SAO 166798, PPM 243575, LTT 617, NLTT 3632, 2MASS J01060202-2227111[6]
Database references
SIMBADdata
Exoplanet Archivedata

HIP 5158 is a star with a pair of orbiting substellar companions, located in the equatorial constellation of Cetus,[1] the whale. It has the older designation CD-23 395, which is derived from the Cordoba Durchmusterung catalogue of southern stars.[6] Based on parallax measurements, it is located 169 light years from the Sun. It has an absolute magnitude of 7.11,[1] but at that distance the star has an apparent visual magnitude of 10.16,[1] which is too dim to be visible to the naked eye. The system is receding with a radial velocity of 15.3 km/s,[4] and it has a relatively high proper motion, traversing the celestial sphere at an angular rate of 0.205″·yr−1.[7]

The spectrum of HIP 5158 matches an ordinary K-type main-sequence star,[8] an orange dwarf, with a stellar classification of K5V.[3] The age of this star is poorly constrained, but it appears to be comparable to the Sun.[5] It is spinning slowly with a rotation period of around 42.3 days. Based on the abundance of iron, this star appears metal rich, having concentration of heavy elements equal to 125% of solar abundance.[3] It has 75% of the mass of the Sun and 60% of the Sun's radius. The star is radiating just 19% of the luminosity of the Sun from its photosphere at an effective temperature of 4,571 K.[5]

  1. ^ a b c d e f g h Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference Lo Curto2010 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  5. ^ a b c d e f g h Cite error: The named reference Bonfanti_et_al_2016 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference simbad was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Luyten1995 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Feroz2011 was invoked but never defined (see the help page).