HR 5256

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HR 5256
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension 13h 57m 32.0592s[1]
Declination +61° 29′ 34.2994″[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[1] km/s
Proper motion (μ) RA: −32.074±0.063[1] mas/yr
Dec.: 216.317±0.049[1] mas/yr
Parallax (π)99.2285 ± 0.0232 mas[1]
Distance32.869 ± 0.008 ly
(10.078 ± 0.002 pc)
Absolute magnitude (MV)6.51[3]
Details[3]
Mass0.82 M☉
Radius0.78[6] R☉
Luminosity0.28 L☉
Surface gravity (log g)4.57 cgs
Temperature4,811 K
Metallicity [Fe/H]0.17[7] dex
Rotational velocity (v sin i)4.6 km/s
Age5.36 Gyr
Other designations
BD+62°1325, HD 122064, HIP 68184, HR 5356, SAO 16230, G 239-008, LTT 14084[8]
Database references
SIMBADdata

HR 5256 is a star located thirty-three[1] 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 very nearly 10 parsecs, so the absolute magnitude of 6.51[3] 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,[1] 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.[9]

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.[6] It is radiating just 28% of the luminosity of the Sun from its photosphere at an effective temperature of 4,811 K.[3]

References[edit]

  1. ^ a b c d e f g h 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.
  2. ^ a b 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.
  3. ^ a b c d e f g 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.
  4. ^ a b 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.
  5. ^ a b "ARICNS 4C04262". ARICNS. Astronomisches Rechen-Institut Heidelberg. March 4, 1998. Archived from the original on 2011-06-07. Retrieved 2010-12-07.
  6. ^ a b 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.
  7. ^ 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.
  8. ^ "HD 122064". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-14.
  9. ^ 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.
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