Delta Lupi
Delta Lupi (δ Lupi, δ Lup) is a star in the southern circumpolar constellation of Lupus. In traditional Chinese astronomy, it is "the 2nd (star) of the Cavalry Officer" (騎官二). With an apparent visual magnitude of 3.22, it is the fourth-brightest star in the constellation. The distance to this star has been measured using the parallax technique, yielding an estimate of roughly 900 light-years with a 15% margin of error.

The spectrum of this star matches a stellar classification of B1.5 IV, which indicates this star has entered the subgiant stage and is in the process of evolving into a giant star. It is radiating around 10,000 times the luminosity of the Sun from its outer atmosphere at an effective temperature of 23,000 K, giving it a blue-white hue. This star has nearly 12 times the mass of the Sun and is roughly 15 million years old.

Delta Lupi is a Beta Cephei variable star that undergoes periodic pulsations. It has a single period of variability lasting 0.1655 days, or six cycles per day. This is a proper motion member of the Upper-Centaurus Lupus sub-group in the Scorpius-Centaurus OB association, the nearest such co-moving association of massive stars to the Sun.
Q523
star
Concept
Q1067416
circumpolar constellation
Concept
Q10571
Lupus
CEL
Q7850
Chinese
Concept
Q124313
apparent visual magnitude
Concept
Q165074
parallax
Concept
Q531
light-year
Concept
Q1352827
margin of error
Concept
Q752171
spectrum
Concept
Q25377588
stellar classification
Concept
Q6227
subgiant
Concept
Q6472
evolving
Concept
Q5875
giant star
Concept
Q525
Sun
CEL
Q11579
K
Concept
Q764463
Beta Cephei
CEL
Q6243
variable star
Concept
Q193223
proper motion
Concept
Q45059
Scorpius-Centaurus
CEL
Q736194
OB association
Concept
Q136235
Delta Lupi
CEL
Q136235
Delta Lupi
CEL
+2^^http://www.w3.org/2001/XMLSchema#decimal
2
NUMBER
+3.22^^http://www.w3.org/2001/XMLSchema#decimal
3.22
NUMBER
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15
NUMBER
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1.5
NUMBER
+12^^http://www.w3.org/2001/XMLSchema#decimal
12
NUMBER
+15^^http://www.w3.org/2001/XMLSchema#decimal
15
NUMBER
+0.165^^http://www.w3.org/2001/XMLSchema#decimal
0.165
NUMBER
+5^^http://www.w3.org/2001/XMLSchema#decimal
5
NUMBER
instance of
constellation
type of variable star
instance of
subclass of