Rho Tucanae

Rho Tucanae

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Tucana
Right ascension	Template:RA
Declination	Template:DEC
Apparent magnitude (V)	+5.38
Characteristics
Spectral type	F6 V
U−B Template:Engvar	+0.00
B−V Template:Engvar	+0.50
Astrometry
Radial velocity (Rv)	km/s
Proper motion (μ)	RA: +53.444 mas/yr Dec.: +41.180 mas/yr
Parallax (π)	23.6721±0.0631 mas
Distance	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)	+2.75
Orbit
Period (P)	4.8202 d
Eccentricity (e)	0.02
Periastron epoch (T)	2419299.11 JD
Semi-amplitude (K1) (primary)	26.1 km/s
Details
ρ Tuc A
Mass	1.66 Template:Solar mass
Luminosity	9.7 Template:Solar luminosity
Surface gravity (log g)	cgs
Temperature	K
Metallicity [Fe/H]	−0.26 dex
Rotational velocity (v sin i)	km/s
Age	2.64 Gyr
ρ Tuc B
Mass	0.33 Template:Solar mass
Metallicity [Fe/H]	{{{metal_fe2}}} dex
Other designations
ρ Tuc, CPD−66°47, FK5 2047, HD 4089, HIP 3330, HR 187, SAO 248237
Database references
SIMBAD	data

Rho Tucanae (ρ Tuc, ρ Tucanae) is a binary star system in the southern constellation of Tucana. It is visible to the naked eye with a combined apparent visual magnitude of +5.38. Based upon an annual parallax shift of as seen from Earth, it is located 138 light years from the Sun.

This is a single-lined spectroscopic binary with a close, nearly circular orbit having a period of 4.82 days and an eccentricity of 0.02. The primary member, component A, is a yellow-white hued F-type main sequence star with a stellar classification of F6 V. It is around 2.6 billion years old and a member of the thin disk population. The primary has about 1.66 times the mass of the Sun while the secondary is just 0.33 times the Sun's mass.