Lambda Arae

Lambda Arae
Location of λ Arae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ara
Right ascension 17h 40m 23.82558s[1]
Declination −49° 24′ 56.0993″[1]
Apparent magnitude (V) 4.77[2]
Characteristics
Spectral type F4 V[3]
U−B color index −0.04[2]
B−V color index +0.40[2]
R−I color index +0.22
Variable type 3.10[4]
Astrometry
Radial velocity (Rv)+3.6[4] km/s
Proper motion (μ) RA: +104.233[1] mas/yr
Dec.: −175.956[1] mas/yr
Parallax (π)47.7045 ± 0.1368 mas[1]
Distance68.4 ± 0.2 ly
(20.96 ± 0.06 pc)
Absolute magnitude (MV)+3.06[5]
Details
Mass1.4[1] M☉
Radius1.7[1] R☉
Luminosity4.7[1] L☉
Surface gravity (log g)4.06[1] cgs
Temperature6,495[1] K
Metallicity [Fe/H]−0.24[4] dex
Rotational velocity (v sin i)15.5[6] km/s
Age2.4[1] Gyr
Other designations
CD−49°11616, GJ 9597, HD 160032, HIP 86486, HR 6569, NSV 23218, NLTT 45187, SAO 228257[7]
Database references
SIMBADdata

Lambda Arae (λ Ara, λ Arae) is the Bayer designation for a star in the southern constellation of Ara. It is at a distance of 68 light-years (21 parsecs) from Earth. The apparent visual magnitude of this star is 4.77,[2] making it bright enough to be seen with the naked eye.

The spectrum of this star matches a stellar classification of F4 V,[3] which places it among the category of F-type main sequence stars. It shines with 4.7 times the luminosity of the Sun. The outer atmosphere is radiating this energy at an effective temperature of 6,495 K, giving it the yellow-white hue of an F-type star. There is some evidence that this may be a binary star system consisting of two stars with identical masses.[6]

Examination of Lambda Arae with the Spitzer Space Telescope shows an excess of infrared emission at a wavelength of 70 μm. This suggests it may be orbited by a disk of dust at a radius of more than 15 astronomical units[8]

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  3. ^ a b Cite error: The named reference aj132_1_161 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference aaa501_3_941 was invoked but never defined (see the help page).
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  6. ^ a b Cite error: The named reference mnras415_2_1240 was invoked but never defined (see the help page).
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  8. ^ Cite error: The named reference apj705_1_89 was invoked but never defined (see the help page).