Tau Librae

Tau Librae
Observation data Epoch J2000.0 Equinox J2000.0
Constellation	Libra
Right ascension	15^h 38^m 39.38^s
Declination	−29° 46′ 39.7″
Apparent magnitude (V)	+3.66
Absolute magnitude (V)	-2.01
Distance	445 ly (136.503 pc)
Spectral type	B2.5V
Other designations
40 Librae, CD -29 11837, HD 139365, HIP 76600, HR 5812, SAO 183649.^[1]

Tau Librae (τ Lib, τ Librae) is a Class B2.5, fourth-magnitude star in the constellation Libra. Tau Librae is a stellar system located about 445 light-years from Earth. This star has 3.2 times the radius of the Sun and its outer atmosphere has an effective temperature of 20,911 K.^[2]

References

↑ "HD 139365 -- Star", SIMBAD Astronomical Database, retrieved 2007-01-22
↑ Underhill, A. B.; et al. (November 1979), "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars", Monthly Notices of the Royal Astronomical Society, 189: 601–605, Bibcode:1979MNRAS.189..601U, doi:10.1093/mnras/189.3.601

Stars of Libra

Bayer	α (Zubenelgenubi) β (Zubeneschamali) γ (Zuben Elakrab) δ (Zuben Elakribi) ε ζ¹ ζ³ ζ⁴ η θ ι¹ ι² κ λ μ ν ξ¹ ξ² ο σ (Brachium, γ Sco) 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 GX HI HM HP HR IU KU

HR	5390 5393 5438 5455 5499 5504 5513 5518 5521 5522 5583 5590 5620 5641 5655 5658 5669 5678 5707 5720 5749 5756 5762 5765 5801 5806 5809 5810 5816 5819 5847 5856 5866 5896 5927

HD	126363 132953 134440 134758 136646 137798 140283 141569 141937

Gliese	Gliese 570 (KX) Gliese 581 (HO)

Other	HE 1523-0901 2MASS 1507-1627 WISE 1541-2250

List

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