HD 149837

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Apparentmagnitude(V)6.18[3]
Apparentmagnitude(V)8.98[5]
SpectraltypeF6V[6]
Apparent magnitude(B)6.660
HD 149837
Observation data
Epoch J2000      Equinox J2000
Constellation Ara[1]
A
Right ascension 16h 40m 50.48327s[2]
Declination −60° 26′ 47.2071″[2]
Apparent magnitude (V) 6.18[3]
B
Right ascension 16h 40m 50.61454s[4]
Declination −60° 26′ 45.8673″[4]
Apparent magnitude (V) 8.98[5]
Characteristics
A
Spectral type F6V[6]
Apparent magnitude (B) 6.660
Apparent magnitude (J) 5.217
Apparent magnitude (H) 4.969
Apparent magnitude (K) 4.886
B−V color index +0.17[3]
Astrometry
A
Radial velocity (Rv)3.9±0.2[7] km/s
Proper motion (μ) RA: +59.084 mas/yr[2]
Dec.: −73.274 mas/yr[2]
Parallax (π)31.3707±0.0212 mas[2]
Distance103.97 ± 0.07 ly
(31.88 ± 0.02 pc)
Absolute magnitude (MV)+3.69[1]
B
Proper motion (μ) RA: +57.834 mas/yr[4]
Dec.: −76.449 mas/yr[4]
Parallax (π)31.3785±0.0402 mas[4]
Distance103.9 ± 0.1 ly
(31.87 ± 0.04 pc)
Details
A
Mass1.25[8] M☉
Radius1.348[9] R☉
Luminosity2.634[9] L☉
Surface gravity (log g)4.16[6] cgs
Temperature6,401±80[10] K
Metallicity [Fe/H]−0.08[6] dex
Age2.90[10] Gyr
B
Mass0.79[8] M☉
Radius0.67[11] R☉
Luminosity0.248[11] L☉
Temperature4,987[11] K
Other designations
CD−60°6381, HD 149837, HIP 81657, HR 6177, SAO 253651
Database references
SIMBADdata

HD 149837 is a binary star in the southern constellation of Ara. Parallax measurements give a distance of 103.9 light-years.

The components of this system have an estimated separation of 45.8 astronomical units.[8] The primary, of apparent magnitude +6.24, can be viewed to the naked eye only from sufficiently dark skies, far from light pollution.[12] Its spectrum mathces a class of F6V,[6] making it a F-type main-sequence star. Around 1.25 times more massive than the Sun[8] and 2.9 billion years old,[10] it has 1.35 times the Sun's radius and irradiates 2.6 times the Sun's luminosity from its photosphere[9] at an effective temperature of 6,401 K.[10]

The secondary's apparent magnitude is 8.98,[5] too faint to be viewed with the naked eye.[12] It has 0.79 times the mass of the Sun, 0.67 times the radius and irradiates 25% of its luminosity at an effective temperature of 4,987 K.[11]

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