Back HR 858 Azerbaijani HR 858 French HR 858 Japanese HR 858 Portuguese HD 17926 Swedish HD 17926 Chinese
 Position of HR 858 in Fornax | |
| Observation data Epoch J2000.00 Equinox J2000.00 | |
|---|---|
| Constellation | Fornax |
| Right ascension | 02h 51m 56.246s[1] |
| Declination | −30° 48′ 52.26″[1] |
| Apparent magnitude (V) | 6.382[2] |
| Characteristics | |
| Evolutionary stage | F6V[3] + M[4] |
| Spectral type | Main sequence |
| B−V color index | +0.484[5] |
| Astrometry | |
| Radial velocity (Rv) | +9.77±0.12[1] km/s |
| Proper motion (μ) | RA: 123.435(25) mas/yr[1] Dec.: 105.996(37) mas/yr[1] |
| Parallax (π) | 31.5418 ± 0.0352 mas[1] |
| Distance | 103.4 ± 0.1 ly (31.70 ± 0.04 pc) |
| Absolute magnitude (MV) | +3.82[5] |
| Details[6] | |
| A | |
| Mass | 1.204±0.052 M☉ |
| Radius | 1.258±0.019 R☉ |
| Luminosity | 2.31±0.12 L☉ |
| Surface gravity (log g) | 4.30±0.06 cgs |
| Temperature | 6,354±70 K |
| Metallicity [Fe/H] | 0.025±0.050 dex |
| Rotation | 6.7±1.3 d |
| Rotational velocity (v sin i) | 7.5±0.2 km/s |
| Age | 2.0±0.6 Gyr |
| B | |
| Radius | 0.17±0.04[4] R☉ |
| Temperature | 2,800±300[4] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
HR 858 (also known as HD 17926 or TOI-396) is a star with a planetary system located 103 light-years from the Sun in the southern constellation of Fornax. It has a yellow-white hue and is visible to the naked eye, but it is a challenge to see with an apparent visual magnitude of 6.4.[2] The star is drifting further away with a radial velocity of 10 km/s.[1] It has an absolute magnitude of +3.82.[5]
This object is a slightly-evolved F-type main-sequence star with a stellar classification of F6V,[3] which indicates it is generating energy through core hydrogen fusion. It is roughly two[8] billion years old and is spinning with a projected rotational velocity of 8.3 km/s. The star has 1.1 times the mass of the Sun and 1.3 times the Sun's radius. It is radiating 2.3 times the luminosity of the Sun from its photosphere at an effective temperature of 6,201 K.[4]
A faint co-moving stellar companion, designated component B, at an angular separation of 8.4″. This corresponds to a projected separation of 270 AU. It is a red dwarf star.[4]
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