Hr 5256

HR 5256
Observation data; Epoch J2000 Equinox J2000
Constellation	Ursa Major
Right ascension	13h 57m 32.0592s
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 [Fe/H]	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^[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

^ ^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.
^ ^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.
^ ^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.
^ ^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.
^ ^a ^b "ARICNS 4C04262". ARICNS. Astronomisches Rechen-Institut Heidelberg. March 4, 1998. Archived from the original on 2011-06-07. Retrieved 2010-12-07.
^ ^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.
^ 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.

[Gaia_DR2-1] ^ ^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.

[aaass89_2_415-2] 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.

[Earle2017-3] ^ ^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.

[aaa406_995-4] 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-5] "ARICNS 4C04262". ARICNS. Astronomisches Rechen-Institut Heidelberg. March 4, 1998. Archived from the original on 2011-06-07. Retrieved 2010-12-07.

[apjss168_2_297-6] 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.

[aaa480_1_91-7] 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.

[Simbad-8] "HD 122064". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-14.

[BailerJones2018-9] 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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Observation data Epoch J2000 Equinox J2000
Constellation	Ursa Major
Right ascension	13^h 57^m 32.0592^s^[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 (R_v)	−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]
Distance	32.869 ± 0.008 ly (10.078 ± 0.002 pc)
Absolute magnitude (M_V)	6.51^[3]

Details^[3]

Mass	0.82 `M`_☉
Radius	0.78^[6] `R`_☉
Luminosity	0.28 `L`_☉
Surface gravity (log g)	4.57 cgs
Temperature	4,811 K
Metallicity [Fe/H]	0.17^[7] 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^[8]
Database references
SIMBAD	data