HR 5256
Star in the constellation Ursa Major
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HR 5256 is a star located 32.869[6] light-years away from the Sun in the northern circumpolar constellation of Ursa Major. It has an orange hue and is a challenge to view with the naked eye, having an apparent visual magnitude of 6.52.[2] The distance to this star is just over 10 parsecs, so the absolute magnitude of 6.51[3] is almost the same as the star's apparent magnitude. HR 5256 is drifting nearer to the Sun with a radial velocity of −26.4 km/s,[6] and will make its closest approach to the Sun in about 333,000±16,000 years, when it will be at a distance of 12.72 ± 0.65 light-years.[10]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 13h 57m 32.05836s[1] |
| Declination | +61° 29′ 34.3000″[1] |
| Apparent magnitude (V) | 6.52[2][3] |
| Characteristics | |
| Spectral type | K3 V[4] |
| U−B color index | 0.98[5] |
| B−V color index | 1.01[5] |
| Astrometry | |
| Radial velocity (Rv) | −26.376±0.0011[6] km/s |
| Proper motion (μ) | RA: −31.693(22) mas/yr[1] Dec.: +216.290(21) mas/yr[1] |
| Parallax (π) | 99.3325±0.0193 mas[1] |
| Distance | 32.835 ± 0.006 ly (10.067 ± 0.002 pc) |
| Absolute magnitude (MV) | 6.51[3] |
| Details[3] | |
| Mass | 0.82 M☉ |
| Radius | 0.78[7] R☉ |
| Luminosity | 0.28 L☉ |
| Surface gravity (log g) | 4.57 cgs |
| Temperature | 4,811 K |
| Metallicity [Fe/H] | 0.17[8] dex |
| Rotational velocity (v sin i) | 4.6 km/s |
| Age | 5.36 Gyr |
| Other designations | |
| BD+62°1325, HD 122064, HIP 68184, HR 5256, SAO 16230, G 239-008, LTT 14084[9] | |
| Database references | |
| SIMBAD | data |
This object is an ordinary K-type main-sequence star with a stellar classification of K3 V,[4] which indicates it is undergoing core hydrogen fusion. It is over five billion years of age and is spinning slowly with a projected rotational velocity of 4.6 km/s.[3] The star has an estimated 82%[3] of the Sun's mass and 78% of the Sun's radius.[7] It is radiating just 28% of the luminosity of the Sun from its photosphere at an effective temperature of 4,811 K.[3]