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] |
Distance | 103.97 ± 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] |
Distance | 103.9 ± 0.1 ly (31.87 ± 0.04 pc) |
Details | |
A | |
Mass | 1.25 [8] M☉ |
Radius | 1.348 [9] R☉ |
Luminosity | 2.634 [9] L☉ |
Surface gravity (log g) | 4.16 [6] cgs |
Temperature | 6,401±80 [10] K |
Metallicity [Fe/H] | −0.08 [6] dex |
Age | 2.90 [10] Gyr |
B | |
Mass | 0.79 [8] M☉ |
Radius | 0.67 [11] R☉ |
Luminosity | 0.248 [11] L☉ |
Temperature | 4,987 [11] K |
Other designations | |
CD−60°6381, HD 149837, HIP 81657, HR 6177, SAO 253651 | |
Database references | |
SIMBAD | data |
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]