Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ara |
Right ascension | 18h 06m 37.87129s [1] |
Declination | –50° 05′ 29.3125″ [1] |
Apparent magnitude (V) | +3.67 [2] |
Characteristics | |
Spectral type | B2 Ib [3] |
U−B color index | –0.870 [2] |
B−V color index | –0.109 [2] |
Astrometry | |
Radial velocity (Rv) | +3.4 [4] km/s |
Proper motion (μ) |
RA: –8.27
[1]
mas/
yr Dec.: –8.70 [1] mas/ yr |
Parallax (π) | 4.01 ± 0.15 mas [1] |
Distance | 810 ± 30
ly (249 ± 9 pc) |
Absolute magnitude (MV) | −3.33 [5] |
Details | |
Mass | 8.9 ± 0.1 [6] M☉ |
Radius | 20.1 [7] R☉ |
Luminosity | 3,450 [5] L☉ |
Surface gravity (log g) | 2.70 [8] cgs |
Temperature | 17,231 ± 231 [7] K |
Rotational velocity (v sin i) | 95 [9] km/s |
Age | 28.2 ± 4.7 [6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Theta Arae, Latinized from θ Arae, is the Bayer designation for a star in the constellation Ara. It has an apparent visual magnitude of +3.67, [2] which is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 4.01 mas, [1] Theta Arae is 810 light-years (250 parsecs) distant from the Earth.
This is a supergiant star with a stellar classification of B2 Ib. [3] It has nearly nine [6] times the mass of the Sun and is over 20 [7] times the Sun's radius. The outer atmosphere of this star has an effective temperature of 17,231 K; [7] much hotter than the surface of the Sun. At this heat, the star shines with the characteristic blue-white hue of a B-type star. [11]
{{
cite web}}
: CS1 maint: postscript (
link)
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ara |
Right ascension | 18h 06m 37.87129s [1] |
Declination | –50° 05′ 29.3125″ [1] |
Apparent magnitude (V) | +3.67 [2] |
Characteristics | |
Spectral type | B2 Ib [3] |
U−B color index | –0.870 [2] |
B−V color index | –0.109 [2] |
Astrometry | |
Radial velocity (Rv) | +3.4 [4] km/s |
Proper motion (μ) |
RA: –8.27
[1]
mas/
yr Dec.: –8.70 [1] mas/ yr |
Parallax (π) | 4.01 ± 0.15 mas [1] |
Distance | 810 ± 30
ly (249 ± 9 pc) |
Absolute magnitude (MV) | −3.33 [5] |
Details | |
Mass | 8.9 ± 0.1 [6] M☉ |
Radius | 20.1 [7] R☉ |
Luminosity | 3,450 [5] L☉ |
Surface gravity (log g) | 2.70 [8] cgs |
Temperature | 17,231 ± 231 [7] K |
Rotational velocity (v sin i) | 95 [9] km/s |
Age | 28.2 ± 4.7 [6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Theta Arae, Latinized from θ Arae, is the Bayer designation for a star in the constellation Ara. It has an apparent visual magnitude of +3.67, [2] which is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 4.01 mas, [1] Theta Arae is 810 light-years (250 parsecs) distant from the Earth.
This is a supergiant star with a stellar classification of B2 Ib. [3] It has nearly nine [6] times the mass of the Sun and is over 20 [7] times the Sun's radius. The outer atmosphere of this star has an effective temperature of 17,231 K; [7] much hotter than the surface of the Sun. At this heat, the star shines with the characteristic blue-white hue of a B-type star. [11]
{{
cite web}}
: CS1 maint: postscript (
link)