00h44m26.65s, −26° 30′ 56.45″| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Sculptor |
| Right ascension | 00h44m 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] |
| Distance | 111.6 ± 0.2 ly (34.23 ± 0.07 pc) |
| Absolute magnitude (MV) | 5.23[2] |
| Details[4] | |
| Mass | 0.883±0.024 M☉ |
| Radius | 0.846±0.028 R☉ |
| Luminosity | 0.71±0.004[5] L☉ |
| Surface gravity (log g) | 4.501±0.036 cgs |
| Temperature | 5,717±33 K |
| Metallicity [Fe/H] | −0.28±0.02 dex |
| Rotational velocity (v sin i) | 4.4[6] km/s |
| Age | 6.6±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 | |
| SIMBAD | data |
| ARICNS | data |
HD 4208 is a star with an orbiting exoplanetary companion in the southern constellationofSculptor. 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 classificationofG7V 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]
| 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 |
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