Upsilon2 Centauri

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]

For other stars with this Bayer designation, see υ Centauri.

Upsilon² Centauri

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
υ2 Cen, CD−44°9040, GC 18939, HD 122223, HIP 68523, HR 5260, SAO 224621[10]
Database references
SIMBAD	data

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]