HR 4458
From Infogalactic: the planetary knowledge core
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Hydra |
| Right ascension | 11h 34m 29.487s[1] |
| Declination | –32° 49′ 52.82″[1] |
| Apparent magnitude (V) | 5.97[2]/15 |
| Characteristics | |
| Spectral type | K0 V[3] + DC8[4] |
| U−B color index | 0.325[2] |
| B−V color index | 0.80[2] |
| V−R color index | 0.44 |
| R−I color index | 0.40 |
| Astrometry | |
| Radial velocity (Rv) | –22.21[5] km/s |
| Proper motion (μ) | RA: –671.54[6] mas/yr Dec.: 823.85[6] mas/yr |
| Parallax (π) | 104.61 ± 0.37[6] mas |
| Distance | 31.2 ± 0.1 ly (9.56 ± 0.03 pc) |
| Details | |
| HR 4458 A | |
| Radius | 0.84[7] R☉ |
| Luminosity (bolometric) | 0.368[8] L☉ |
| Surface gravity (log g) | 4.59[9] cgs |
| Temperature | 5,241[9] K |
| Metallicity [Fe/H] | –0.37[9] dex |
| Rotational velocity (v sin i) | 6.79[10] km/s |
| Age | 4.6–5.8[11] Gyr |
| Other designations | |
| WD 1132-325: VB 04 | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
HR 4458 (289 G. Hydrae) is a binary star system in the constellation Hydra. At a distance of 31 light years, it is the closest star system to the solar system within this constellation. The primary is K-type main-sequence star of class K0. It has a common proper motion companion at an angular separation of 16.2″. This is a white dwarf star with a classification of DC8.[4]
The primary has been examined for the presence of an infrared excess, but none was detected.[8]
References
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