Upsilon Librae

Upsilon Librae
Observation data; Equinox J2000.0]] (ICRS)
Constellation	Libra
Right ascension	15h 37m 01.45020s
Declination	−28° 08′ 06.2926″
Apparent magnitude (V)	3.628
Characteristics
Spectral type	K3 III
U−B color index	+1.586
B−V color index	+1.374
Astrometry
Radial velocity (Rv)	−24.9±0.7 km/s
Proper motion (μ)	RA: −12.82 mas/yr ; Dec.: −4.15 mas/yr
Parallax (π)	14.58 ± 0.19 mas
Distance	224 ± 3 ly ; (68.6 ± 0.9 pc)
Absolute magnitude (MV)	−0.28
Details
Mass	1.67 M☉
Radius	31.5 R☉
Luminosity	309 L☉
Surface gravity (log g)	1.58 cgs
Temperature	4,135±20 K
Metallicity [Fe/H]	−0.02 dex
Age	3.14 Gyr
Other designations
	υ Lib, 39 Lib, CD−27° 10464, FK5 579, HD 139063, HIP 76470, HR 5794, SAO 183619.
Database references
SIMBAD	data

Short description: Binary star in the constellation Libra

Upsilon Librae (υ Lib, υ Librae) is the Bayer designation for a double star^[9] in the zodiac constellation Libra. With an apparent visual magnitude of 3.628,^[2] it is visible to the naked eye. The distance to this star, based upon an annual parallax shift of 14.58,^[1] is around 224 light years. It has a magnitude 10.8 companion at an angular separation of 2.0 arc seconds along a position angle of 151°, as of 2002.^[10]

The brighter component is an evolved K-type giant star with a stellar classification of K3 III.^[3] The measured angular diameter, after correction for limb darkening, is 4.27±0.05 mas.^[11] At the estimated distance of the star, this yields a physical size of about 31.5 times the radius of the Sun.^[7] It has 1.67 times the mass of the Sun and radiates 309 times the solar luminosity from its outer atmosphere at an effective temperature of 4,135 K.^[6] The star is about three billion years old.^[6]

References

↑ ^1.0 ^1.1 ^1.2 ^1.3 ^1.4 ^1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
↑ ^2.0 ^2.1 ^2.2 ^2.3 Celis S., L. (October 1975), "Photoelectric photometry of late-type variable stars", Astronomy and Astrophysics Supplement Series 22: 9–17, Bibcode: 1975A&AS...22....9C.
↑ ^3.0 ^3.1 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode: 1982mcts.book.....H
↑ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
↑ Ryon, Jenna et al. (August 2009), "Comparing the Ca ii H and K Emission Lines in Red Giant Stars", Publications of the Astronomical Society of the Pacific 121 (882): 842, doi:10.1086/605456, Bibcode: 2009PASP..121..842R.
↑ ^6.0 ^6.1 ^6.2 Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal 150 (3): 23, doi:10.1088/0004-6256/150/3/88, 88, Bibcode: 2015AJ....150...88L.
↑ ^7.0 ^7.1 Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1, https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41. The radius (R_*) is given by:
[math]\displaystyle{ \begin{align} 2\cdot R_* & = \frac{(68.6\cdot 4.27\cdot 10^{-3})\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\ & \approx 63.0\cdot R_{\bigodot} \end{align} }[/math]
↑ "ups Lib". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=ups+Lib.
↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
↑ Mason, B. D. et al. (2014), The Washington Visual Double Star Catalog, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M
↑ Richichi, A. et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics 431 (2): 773–777, doi:10.1051/0004-6361:20042039, Bibcode: 2005A&A...431..773R.

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[vanLeeuwen2007-1] 1.0 ^1.1 ^1.2 ^1.3 ^1.4 ^1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.

[Celis1975-2] 2.0 ^2.1 ^2.2 ^2.3 Celis S., L. (October 1975), "Photoelectric photometry of late-type variable stars", Astronomy and Astrophysics Supplement Series 22: 9–17, Bibcode: 1975A&AS...22....9C.

[houk1979-3] 3.0 ^3.1 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode: 1982mcts.book.....H

[deBruijne2012-4] Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.

[Ryon2009-5] Ryon, Jenna et al. (August 2009), "Comparing the Ca ii H and K Emission Lines in Red Giant Stars", Publications of the Astronomical Society of the Pacific 121 (882): 842, doi:10.1086/605456, Bibcode: 2009PASP..121..842R.

[Luck2015-6] 6.0 ^6.1 ^6.2 Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal 150 (3): 23, doi:10.1088/0004-6256/150/3/88, 88, Bibcode: 2015AJ....150...88L.

[lang2006-7] 7.0 ^7.1 Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1, https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41. The radius (R_*) is given by:
[math]\displaystyle{ \begin{align} 2\cdot R_* & = \frac{(68.6\cdot 4.27\cdot 10^{-3})\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\ & \approx 63.0\cdot R_{\bigodot} \end{align} }[/math]

[SIMBAD-8] "ups Lib". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=ups+Lib.

[Eggleton2008-9] Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.

[Mason2014-10] Mason, B. D. et al. (2014), The Washington Visual Double Star Catalog, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M

[Richichi2005-11] Richichi, A. et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics 431 (2): 773–777, doi:10.1051/0004-6361:20042039, Bibcode: 2005A&A...431..773R.

Observation data Equinox J2000.0]] (ICRS)
Constellation	Libra
Right ascension	15^h 37^m 01.45020^s^[1]
Declination	−28° 08′ 06.2926″^[1]
Apparent magnitude (V)	3.628^[2]
Characteristics
Spectral type	K3 III^[3]
U−B color index	+1.586^[2]
B−V color index	+1.374^[2]
Astrometry

Radial velocity (R_v)	−24.9±0.7^[4] km/s
Proper motion (μ)	RA: −12.82^[1] mas/yr Dec.: −4.15^[1] mas/yr
Parallax (π)	14.58 ± 0.19^[1] mas
Distance	224 ± 3 ly (68.6 ± 0.9 pc)
Absolute magnitude (M_V)	−0.28^[5]

Details^[6]

Mass	1.67 `M`_☉
Radius	31.5^[7] `R`_☉
Luminosity	309 `L`_☉
Surface gravity (log g)	1.58 cgs
Temperature	4,135±20 K
Metallicity [Fe/H]	−0.02 dex
Age	3.14 Gyr

Other designations
υ Lib, 39 Lib, CD−27° 10464, FK5 579, HD 139063, HIP 76470, HR 5794, SAO 183619.^[8]
Database references
SIMBAD	data

v t e Stars of Libra
Bayer	α¹ α² (Zubenelgenubi) β (Zubeneschamali) γ (Zubenelhakrabi) δ (Zuben Elakribi) ε ζ¹ ζ⁴ η θ ι¹ ι² κ λ μ ν ξ¹ ξ² ο σ (Brachium) τ υ
Flamsteed	2 3 4 5 10 11 12 16 17 18 22 23 26 28 30 33 36 37 41 42 47 48 49 50 30 Ser
Variable	UZ VZ EH ES FY GW GZ (ζ²) GX HI HM HO HP HR IU KU KX
HR	5390 5393 5438 5455 5499 5504 5513 5518 5521 5522 5583 5590 5620 5641 5655 5658 5669 5678 5707 5720 5749 5750 (ζ³) 5756 5762 5765 5801 5806 5809 5810 5816 5819 5847 5856 5866 5896 5927
HD	126363 132953 133131 134439 134440 134758 136646 137798 139139 140283 141569 141937
Other	HE 1523-0901 2MASS 1507−1627 WISE 1541−2250
List