Theta Octantis
θ Octantis, Latinized as Theta Octantis, is a single star in the southern circumpolar constellation of Octans, near the constellation border with Hydrus. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.78. The star is located approximately 217 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +22.5 km/s.

This is an aging giant star with a stellar classification of K3III, having exhausted the supply of hydrogen at its core then cooled and expanded. It has been catalogued as a red clump giant, which would indicate it is on the horizontal branch and is undergoing core helium fusion. At present it has 16 times the radius of the Sun. This star has 1.20 times the mass of the Sun and is radiating 79 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,325 K.
Q466126
Latinized
ORG
Q523
star
Concept
Q1067416
circumpolar constellation
Concept
Q10503
Octans
CEL
Q10416
Hydrus
CEL
Q124313
apparent visual magnitude
Concept
Q906561
parallax
Concept
Q240105
radial velocity
Concept
Q5875
giant star
Concept
Q25377588
stellar classification
Concept
Q60790215
core
Concept
Q1358411
red clump
Concept
Q50076
horizontal branch
Concept
Q336225
helium fusion
Concept
Q48440
radius of the Sun
Concept
Q180892
mass of the Sun
Concept
Q843877
Sun's luminosity
Concept
Q6372
photosphere
Concept
Q854050
effective temperature
Concept
Q5176197
Theta Octantis
CEL
+4.78^^http://www.w3.org/2001/XMLSchema#decimal
4.78
NUMBER
++22.5^^http://www.w3.org/2001/XMLSchema#decimal
+22.5
NUMBER
+3^^http://www.w3.org/2001/XMLSchema#decimal
3
NUMBER
+16^^http://www.w3.org/2001/XMLSchema#decimal
16
NUMBER
+1.20^^http://www.w3.org/2001/XMLSchema#decimal
1.20
NUMBER
+79^^http://www.w3.org/2001/XMLSchema#decimal
79
NUMBER
instance of
constellation
mass
shares border with