Beta Octantis
Beta Octantis, Latinized from β Octantis, is a probable astrometric binary star system in the southern circumpolar constellation of Octans. It is faintly visible to the naked eye with an apparent visual magnitude of 4.13. Based upon an annual parallax shift of 21.85 mas as seen from Earth, it is located about 149 light years from the Sun. It is moving away from the Sun with a radial velocity of +19 km/s.

Based upon a stellar classification of A9IV-V, the visible component is an evolving, white-hued A-type star with a spectrum that shows mixed traits of a main sequence and a subgiant star. It has an estimated 2.27 times the mass of the Sun and 3.2 times the Sun's radius. The star is around 500 million years old with a projected rotational velocity of 49 km/s. It is radiating 42 times the Sun's luminosity from its photosphere at an effective temperature of 8,006 K.
Q1806983
Latinized
UNK
Q50053
astrometric binary
Concept
Q1067416
circumpolar constellation
Concept
Q10503
Octans
CEL
Q124313
apparent visual magnitude
Concept
Q906561
parallax shift
Concept
Q12097402
mas
Concept
Q531
light year
Concept
Q240105
radial velocity
Concept
Q25377588
stellar classification
Concept
Q6472
evolving
Concept
Q25377588
A-type star
Concept
Q654182
spectrum
Concept
Q3450
main sequence
Concept
Q6227
subgiant star
Concept
Q180892
mass of the Sun
Concept
Q48440
Sun's radius
Concept
Q6464
projected rotational velocity
Concept
Q843877
Sun's luminosity
Concept
Q6372
photosphere
Concept
Q854050
effective temperature
Concept
Q4897265
Beta Octantis
CEL
+4.13^^http://www.w3.org/2001/XMLSchema#decimal
4.13
NUMBER
+21.85^^http://www.w3.org/2001/XMLSchema#decimal
21.85
NUMBER
++19^^http://www.w3.org/2001/XMLSchema#decimal
+19
NUMBER
+9^^http://www.w3.org/2001/XMLSchema#decimal
9
NUMBER
+2.27^^http://www.w3.org/2001/XMLSchema#decimal
2.27
NUMBER
+3.2^^http://www.w3.org/2001/XMLSchema#decimal
3.2
NUMBER
+49^^http://www.w3.org/2001/XMLSchema#decimal
49
NUMBER
+42^^http://www.w3.org/2001/XMLSchema#decimal
42
NUMBER
constellation
mass
radius