Theta Doradus

Theta Doradus

Template:Location mark Location of θ Doradus (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Dorado
Right ascension	Template:RA
Declination	Template:DEC
Apparent magnitude (V)	+4.82
Characteristics
Spectral type	K2/3 III CNIb/II
U−B Template:Engvar	+1.38
B−V Template:Engvar	+1.28
Astrometry
Radial velocity (Rv)	km/s
Proper motion (μ)	RA: +18.485 mas/yr Dec.: +38.123 mas/yr
Parallax (π)	6.0186±0.1209 mas
Distance	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)	−0.56
Details
Mass	2.23 Template:Solar mass
Radius	35.6 Template:Solar radius
Luminosity	427 Template:Solar luminosity
Surface gravity (log g)	2.5 cgs
Temperature	K
Metallicity [Fe/H]	−0.16 dex
Rotational velocity (v sin i)	2.2 km/s
Age	1.17 Gyr
Metallicity [Fe/H]	{{{metal_fe2}}} dex
Other designations
Template:Odlist
Database references
SIMBAD	data

Theta Doradus, Latinized from θ Doradus, is a solitary star in the southern constellation of Dorado. Based upon an annual parallax shift of 6.64 mas as seen from Earth, it is located around 540 light years from the Sun. With an apparent visual magnitude of +4.82, the star is bright enough to be faintly visible to the naked eye.

This is an evolved orange-hued K-type giant star with a stellar classification of K2/3 III CNIb/II, where the suffix indicates it is a CN star, a cool giant showing unusually strong CN bands in its spectrum. With an age of around 1.17 billion years, it has an estimated 2.23 times the mass of the Sun and has expanded to about 36 times the Sun's radius. It is radiating 427 times the solar luminosity from its photosphere at an effective temperature of 4,320 K.

Naming

In the Chinese astronomical adaptation of the European southern hemisphere constellations, (), meaning White Patches Attached, refers to an asterism consisting of θ Doradus and α Reticuli. Consequently, θ Doradus itself is known as (, Template:Langx.)