Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ara |
Right ascension | 16h 58m 17.94161s [1] |
Declination | −50° 38′ 28.2691″ [1] |
Apparent magnitude (V) | 5.54 [2] |
Characteristics | |
Spectral type | B9 IV [3] or B9 V [4] |
B−V color index | +0.02 [2] |
Astrometry | |
Radial velocity (Rv) | −44.0 [5] km/s |
Proper motion (μ) |
RA: −8.05
[1]
mas/
yr Dec.: −38.68 [1] mas/ yr |
Parallax (π) | 6.28 ± 0.38 mas [1] |
Distance | 520 ± 30
ly (159 ± 10 pc) |
Absolute magnitude (MV) | −0.47 [6] |
Details | |
Mass | 3.42 ± 0.10 [7] M☉ |
Luminosity | 238 [7] L☉ |
Temperature | 10,520 [7] K |
Rotational velocity (v sin i) | 302 [7] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Rho2 Arae is the Bayer designation for a star in the southern constellation of Ara. It received this designation when the star was catalogued by Bode in his Uranographia. This is a rather dim naked-eye star with an apparent visual magnitude of 5.54. [2] Based upon an annual parallax shift of just 6.28 mas, it is around 520 light-years (160 parsecs) distant from the Sun, give or take a 30-light-year margin of error. [1]
The spectrum of this star matches a stellar classification of B9 IV [3] or B9 V. [4] The IV luminosity class would indicate the star is in the subgiant stage, while a V class means it is a main-sequence star like the Sun. In the latter case, it is close to entering the subgiant stage at an estimated 93% of the way through its lifespan on the main sequence. [7]
Rho2 Arae has more than three times the mass of the Sun and shines with 238 times the Sun's luminosity. [7] This energy is being radiated into space from the outer atmosphere at an effective temperature of 10,520 K, [7] giving it the blue-white hue of a B-type star. [9] It is spinning rapidly with a projected rotational velocity of 302 km/s. [7]
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cite web}}
: CS1 maint: postscript (
link)
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ara |
Right ascension | 16h 58m 17.94161s [1] |
Declination | −50° 38′ 28.2691″ [1] |
Apparent magnitude (V) | 5.54 [2] |
Characteristics | |
Spectral type | B9 IV [3] or B9 V [4] |
B−V color index | +0.02 [2] |
Astrometry | |
Radial velocity (Rv) | −44.0 [5] km/s |
Proper motion (μ) |
RA: −8.05
[1]
mas/
yr Dec.: −38.68 [1] mas/ yr |
Parallax (π) | 6.28 ± 0.38 mas [1] |
Distance | 520 ± 30
ly (159 ± 10 pc) |
Absolute magnitude (MV) | −0.47 [6] |
Details | |
Mass | 3.42 ± 0.10 [7] M☉ |
Luminosity | 238 [7] L☉ |
Temperature | 10,520 [7] K |
Rotational velocity (v sin i) | 302 [7] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Rho2 Arae is the Bayer designation for a star in the southern constellation of Ara. It received this designation when the star was catalogued by Bode in his Uranographia. This is a rather dim naked-eye star with an apparent visual magnitude of 5.54. [2] Based upon an annual parallax shift of just 6.28 mas, it is around 520 light-years (160 parsecs) distant from the Sun, give or take a 30-light-year margin of error. [1]
The spectrum of this star matches a stellar classification of B9 IV [3] or B9 V. [4] The IV luminosity class would indicate the star is in the subgiant stage, while a V class means it is a main-sequence star like the Sun. In the latter case, it is close to entering the subgiant stage at an estimated 93% of the way through its lifespan on the main sequence. [7]
Rho2 Arae has more than three times the mass of the Sun and shines with 238 times the Sun's luminosity. [7] This energy is being radiated into space from the outer atmosphere at an effective temperature of 10,520 K, [7] giving it the blue-white hue of a B-type star. [9] It is spinning rapidly with a projected rotational velocity of 302 km/s. [7]
{{
cite web}}
: CS1 maint: postscript (
link)