Theta Canis Majoris

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Template:Short description

Theta Canis Majoris
Template:Location mark
Location of θ Canis Majoris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Canis Major
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.08[2]
Characteristics
Evolutionary stage Red giant branch[3]
Spectral type K4 III[2]
U−B Template:Engvar +1.69[4]
B−V Template:Engvar +1.43[4]
Astrometry
Radial velocity (Rv)Template:Val[5] km/s
Proper motion (μ) RA: −136.454 mas/yr[1]
Dec.: −14.322 mas/yr[1]
Parallax (π)12.0676±0.62 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)[1]
Absolute magnitude (MV)Template:Val[6]
Details[5]
MassTemplate:Val Template:Solar mass
RadiusTemplate:Val[7] Template:Solar radius
LuminosityTemplate:Val[7] Template:Solar luminosity
Surface gravity (log g)Template:Val cgs
TemperatureTemplate:Val[7] K
Metallicity [Fe/H]Template:Val dex
Rotational velocity (v sin i)Template:Val km/s
AgeTemplate:Val Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[8]
Database references
SIMBADdata

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Theta Canis Majoris (θ Canis Majoris) is a solitary,[9] orange-hued star near the northern edge[10] of the constellation Canis Major, forming the nose of the "dog".[11] The star is visible to the naked eye with an apparent visual magnitude of 4.08.[2] Based upon an annual parallax shift of 12.07 mas as seen from Earth,[1] it is located about 270 light years from the Sun. The star is moving away from Earth with a radial velocity of +96.2 km/s.[5]

This is a evolved K-type giant star with a stellar classification of K4 III.[2] Theta Canis Majoris is 5% less massive than the Sun,[5] but has expanded to 33 times the Sun's size.[7] This old star, around ten billion years old,[5] is over two times older than the Solar System.[12] It irradiates 305 times the Sun's luminosity from its expanded photosphere at an effective temperature of 4,200 K.[7] This temperature gives it the cool orange hue of a K-type star.[13]

References

Template:Reflist

Template:Stars of Canis Major

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