V538 Aurigae
V538 Aurigae is a single star in the northern constellation of Auriga. With an apparent visual magnitude of 6.23, this star requires good dark sky conditions to view with the naked eye. It is located at a distance of from Sun based on parallax. The star is drifting further away with a radial velocity of 0.9 km/s. It is a member of the Local Association, and is most likely a thin disk star.

This is a BY Draconis variable, which means it undergoes changes in luminosity because regions of pronounced surface magnetic activity are moved into and out of the line of sight from the Earth as the star rotates (once every 11 days). It has a spectral class of K1 V, indicating that it is a K-type main sequence star. The star has 87% of the mass of the Sun and 82% of the Sun's radius. It is an estimated 3.76 billion years old. The star is radiating 48% of the Sun's luminosity from its photosphere at an effective temperature of 5,303 K.

It has a common proper motion companion designated Vys 465 (HD 233153), which is a red dwarf with a class of M0.5V and a visual magnitude of 9.87. Their projected separation is .
Q523
star
Concept
Q8928
constellation
Concept
Q10476
Auriga
CEL
Q124313
apparent visual magnitude
Concept
Q2722595
good dark sky conditions
Concept
Q525
Sun
CEL
Q906561
parallax
Concept
Q240105
radial velocity
Concept
None
Local Association
UNK
Q7784279
thin disk
Concept
Q797219
BY Draconis variable
Concept
Q6449
magnetic activity
Concept
Q25377588
spectral class
Concept
Q863936
K-type main sequence star
Concept
Q180892
mass of the Sun
Concept
Q48440
Sun's radius
Concept
Q843877
Sun's luminosity
Concept
Q6372
photosphere
Concept
Q854050
effective temperature
Concept
Q5571730
common proper motion
UNK
Q5893
red dwarf
Concept
Q2402851
V538 Aurigae
CEL
+538^^http://www.w3.org/2001/XMLSchema#decimal
538
NUMBER
+6.23^^http://www.w3.org/2001/XMLSchema#decimal
6.23
NUMBER
+0.9^^http://www.w3.org/2001/XMLSchema#decimal
0.9
NUMBER
+11^^http://www.w3.org/2001/XMLSchema#decimal
11
NUMBER
+1^^http://www.w3.org/2001/XMLSchema#decimal
1
NUMBER
+87^^http://www.w3.org/2001/XMLSchema#decimal
87
NUMBER
+82^^http://www.w3.org/2001/XMLSchema#decimal
82
NUMBER
+3.76^^http://www.w3.org/2001/XMLSchema#decimal
3.76
NUMBER
+48^^http://www.w3.org/2001/XMLSchema#decimal
48
NUMBER
+0.5^^http://www.w3.org/2001/XMLSchema#decimal
0.5
NUMBER
+9.87^^http://www.w3.org/2001/XMLSchema#decimal
9.87
NUMBER
constellation
apparent magnitude
type of variable star
instance of