| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 13 57 32.0592 |
| Declination | +61° 29′ 34.2994″ |
| Apparent magnitude (V) | 6.52 |
| Characteristics | |
| Spectral type | K3 V |
| U−B color index | 0.98 |
| B−V color index | 1.01 |
| Astrometry | |
| Radial velocity (Rv) | −26.376±0.0011 km/s |
| Proper motion (μ) | RA: −32.074±0.063 mas/yr Dec.: 216.317±0.049 mas/yr |
| Parallax (π) | 99.2285 ± 0.0232 mas |
| Distance | 32.869 ± 0.008 ly (10.078 ± 0.002 pc) |
| Absolute magnitude (MV) | 6.51 |
| Details | |
| Mass | 0.82 M☉ |
| Radius | 0.78 R☉ |
| Luminosity | 0.28 L☉ |
| Surface gravity (log g) | 4.57 cgs |
| Temperature | 4,811 K |
| Metallicity | 0.17 dex |
| Rotational velocity (v sin i) | 4.6 km/s |
| Age | 5.36 Gyr |
| Other designations | |
| BD+62°1325, HD 122064, HIP 68184, HR 5356, SAO 16230, G 239-008, LTT 14084 | |
| Database references | |
| SIMBAD | data |
HR 5256 is a star located thirty-three 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 The distance to this star is very nearly 10 parsecs, so the absolute magnitude of 6.51 is nearly 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, 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.
This object is an ordinary K-type main-sequence star with a stellar classification of K3 V, 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. The star has an estimated 82% of the Sun's mass and 78% of the Sun's radius. It is radiating just 28% of the luminosity of the Sun from its photosphere at an effective temperature of 4,811 K.
References
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ Oja, T. (August 1991). "UBV photometry of stars whose positions are accurately known. VI". Astronomy and Astrophysics Supplement Series. 89 (2): 415–419. Bibcode:1991A&AS...89..415O.
- ^ Luck, R. Earle (January 2017). "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants". The Astronomical Journal. 153 (1): 19. arXiv:1611.02897. Bibcode:2017AJ....153...21L. doi:10.3847/1538-3881/153/1/21. S2CID 119511744. 21.
- ^ Marrese, P. M.; Boschi, F.; Munari, U. (August 2003). "High resolution spectroscopy over lambda lambda 8500-8750 Å for GAIA. IV. Extending the cool MK stars sample". Astronomy and Astrophysics. 406: 995–999. Bibcode:2003A&A...406..995M. doi:10.1051/0004-6361:20030647.
- ^ "ARICNS 4C04262". ARICNS. Astronomisches Rechen-Institut Heidelberg. March 4, 1998. Archived from the original on 2011-06-07. Retrieved 2010-12-07.
- ^ Takeda, Genya; et al. (February 2007). "Structure and Evolution of Nearby Stars with Planets. II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog". The Astrophysical Journal Supplement Series. 168 (2): 297–318. arXiv:astro-ph/0607235. Bibcode:2007ApJS..168..297T. doi:10.1086/509763. S2CID 18775378. Data obtained from a VizieR query.
- Soubiran, C.; Bienaymé, O.; Mishenina, T. V.; Kovtyukh, V. V. (March 2008). "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants". Astronomy and Astrophysics. 480 (1): 91–101. arXiv:0712.1370. Bibcode:2008A&A...480...91S. doi:10.1051/0004-6361:20078788. S2CID 16602121.
- "HD 122064". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-14.
- Bailer-Jones, C.A.L.; et al. (2018). "New stellar encounters discovered in the second Gaia data release". Astronomy & Astrophysics. 616: A37. arXiv:1805.07581. Bibcode:2018A&A...616A..37B. doi:10.1051/0004-6361/201833456. S2CID 56269929.
