Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Centaurus |
Right ascension | 14h 01m 43.49909 s [1] |
Declination | −45° 36′ 12.2767″ [1] |
Apparent magnitude (V) | +4.33 [2] |
Characteristics | |
Spectral type | F7 II/III [3] |
U−B color index | +0.26 [2] |
B−V color index | +0.61 [2] |
Variable type | None [4] |
Astrometry | |
Radial velocity (Rv) | −7.8±7.4 [5] km/s |
Proper motion (μ) |
RA: +8.64±1.09
[1]
mas/
yr Dec.: −16.25±0.88 [1] mas/ yr |
Parallax (π) | 2.57 ± 1.05 mas [1] |
Distance | approx. 1,300
ly (approx. 400 pc) |
Absolute magnitude (MV) | −3.51 [4] |
Orbit [6] | |
Period (P) | 207.357 d |
Eccentricity (e) | 0.55 |
Periastron epoch (T) | 2423880.5 JD |
Argument of periastron (ω) (secondary) | 88° |
Semi-amplitude (K1) (primary) | 12.7 km/s |
Details | |
Mass | 6.86±0.39 [7] M☉ |
Luminosity (bolometric) | 3,919 [7] L☉ |
Surface gravity (log g) | 2.00 [8] cgs |
Temperature | 6,495 [7] K |
Rotational velocity (v sin i) | 0.0 [8] km/s |
Age | 45.9±4.0 [9] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Upsilon2 Centauri (υ2 Centauri) is a
binary star
[6] system in the southern
constellation
Centaurus. It is visible to the naked eye with an
apparent visual magnitude of +4.33.
[2] Based upon an annual
parallax shift of just 2.57
mas as seen from Earth,
[1] this star is located roughly 1,300
light years from the
Sun. Relative to its neighbors, the system has a
peculiar velocity of 39.2+8.8
−15.2 km/s and it may form a
runaway star system.
[9]
This is a single-lined spectroscopic binary star system with an orbital period of 207.357 days and an eccentricity of 0.55. [6] The primary component has the spectrum of an evolved F-type giant/ bright giant hybrid with a stellar classification of F7 II/III. [3] It is around 46 [9] million years old with 6.9 times the mass of the Sun. The star is radiating 3,919 times the Sun's luminosity from its photosphere at an effective temperature of 6,495 K. [7]