HD 4208

HD 4208 / Cocibolca
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sculptor
Right ascension 00h 44m 26.6507s[1]
Declination –26° 30′ 56.4582″[1]
Apparent magnitude (V) 7.78[2]
Characteristics
Spectral type G7V Fe-1 CH-0.5[3]
B−V color index 0.664±0.004[2]
Astrometry
Radial velocity (Rv)+56.77±0.09[2] km/s
Proper motion (μ) RA: 313.484±0.064[1] mas/yr
Dec.: 149.500±0.047[1] mas/yr
Parallax (π)29.2163 ± 0.0577 mas[1]
Distance111.6 ± 0.2 ly
(34.23 ± 0.07 pc)
Absolute magnitude (MV)5.23[2]
Details[4]
Mass0.883±0.024 M☉
Radius0.846±0.028 R☉
Luminosity0.71±0.004[5] L☉
Surface gravity (log g)4.501±0.036 cgs
Temperature5,717±33 K
Metallicity [Fe/H]−0.28±0.02 dex
Rotational velocity (v sin i)4.4[6] km/s
Age6.6±2.1 gyr[5]
3.813±2.970[4] Gyr
Other designations
Cocibolca, BD−27°223, GJ 9024, HD 4208, HIP 3479, SAO 166526, LTT 410[7]
Database references
SIMBADdata
ARICNSdata

HD 4208 is a star with an orbiting exoplanetary companion in the southern constellation of Sculptor. It has a yellow hue with an apparent visual magnitude of 7.78,[2] making it too dim to be visible to the naked eye. But with binoculars or small telescope it should be an easy target. This object is located at a distance of 111.6 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +57 km/s.[2]

The star HD 4208 is named Cocibolca. The name was selected in the NameExoWorlds campaign by Nicaragua, during the 100th anniversary of the IAU. Cocibolca is the Nahuatl name for the Lake Nicaragua.[8][9]

This is a G-type main-sequence star with a stellar classification of G7V Fe-1 CH-0.5,[3] where the suffix notation indicates underabundances of iron and carbyne in the spectrum. It is roughly 6.6[5] billion years old and is spinning with a projected rotational velocity of 4.4 km/s.[6] The star has 86% of the Sun's mass and radius, and is radiating 71% of the Sun's luminosity from its photosphere at an effective temperature of 5,717 K.[5]

In 2001, a planet was discovered orbiting the star by means of the radial velocity method.[10] This body is orbiting 1.66 AU from the host star with a period of 2.28 years and a low eccentricity of 0.042.[4] The position of this planet near the star's habitable zone means that it will have a strong gravitational perturbation effect on any potential Earth-mass planet that may be orbiting within this region.[11]

The HD 4208 planetary system[4]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b / Xolotlan ≥ 0.810+0.014
−0.015 MJ 		1.662±0.015 832.97+2.15
−1.89 		0.042+0.039
−0.029 		— —
  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 Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Gray2006 was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference Barbato_et_al_2018 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Bonfanti2015 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Earle2017 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).
  8. ^ "Approved names". NameExoworlds. Retrieved 2020-01-02.
  9. ^ "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
  10. ^ Cite error: The named reference Vogt2002 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Hinse2008 was invoked but never defined (see the help page).