FL Lyrae
FL Lyrae is the variable star designation for an eclipsing binary star system in the northern constellation of Lyra. The combined apparent magnitude of the pair is 9.36, which means they are too faint to be seen with the naked eye. Parallax measurements from the Hipparcos spacecraft put the system at a distance of around 420 light years from the Sun. This star system was in the view field of the Kepler space telescope during 2009−2014, which allowed monitoring during that spacecraft's mission.

The variability of this system was discovered from photographic plates in 1935. It is a binary star system with an orbital plane that is nearly aligned with the line of sight to the Earth. Once every 2.1781542 day orbit, each of the closely orbiting stars eclipses its partner, causing a net magnitude drop to 9.4 during the primary eclipse and to magnitude 9.1 when the secondary component is eclipsed. The secondary member covers 51% of the larger star during the primary eclipse, while the primary covers 88% of the secondary.

The measureable properties of an eclipsing binary can allow the physical parameters of the individual components to be worked out in some detail. The primary component has 122% of the Sun's mass, spans 128% of the radius of the Sun, and is emitting 217% of the Sun's luminosity. It is most likely an F-type main sequence star with a stellar classification of F8. The secondary is smaller, with 96% of the mass of the Sun, 96% of the Sun's radius, and radiates just 65% of the Sun's luminosity. This is a G-type main sequence star of class G8.

Based upon light variations measured during eclipses by the Kepler spacecraft, the system may contain a third body with twice the mass of Jupiter and an orbital period of under seven years. As of 2015, this remains to be confirmed.
Q593448
variable star designation
Concept
Q50053
eclipsing binary
Concept
Q8928
constellation
Concept
Q10484
Lyra
CEL
Q124313
apparent magnitude
Concept
Q906561
Parallax
Concept
Q555846
Hipparcos
MISC
Q531
light year
Concept
Q525
Sun
CEL
Q47272
Kepler
MISC
Q800358
orbital plane
Concept
Q605931
line of sight
UNK
Q2
Earth
CEL
Q180892
Sun's mass
Concept
Q48440
radius of the Sun
Concept
Q843877
Sun's luminosity
Concept
Q1353952
F-type main sequence star
Concept
Q25377588
stellar classification
Concept
Q5864
G-type main sequence star
Concept
Q22086872
FL Lyrae
CEL
2009-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2009
DATE
1935-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1935
DATE
2015-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2015
DATE
+9.36^^http://www.w3.org/2001/XMLSchema#decimal
9.36
NUMBER
+2014^^http://www.w3.org/2001/XMLSchema#decimal
2014
NUMBER
+2.178^^http://www.w3.org/2001/XMLSchema#decimal
2.178
NUMBER
+1542^^http://www.w3.org/2001/XMLSchema#decimal
1542
NUMBER
+9.4^^http://www.w3.org/2001/XMLSchema#decimal
9.4
NUMBER
+9.1^^http://www.w3.org/2001/XMLSchema#decimal
9.1
NUMBER
+51^^http://www.w3.org/2001/XMLSchema#decimal
51
NUMBER
+88^^http://www.w3.org/2001/XMLSchema#decimal
88
NUMBER
+8^^http://www.w3.org/2001/XMLSchema#decimal
8
NUMBER
+96^^http://www.w3.org/2001/XMLSchema#decimal
96
NUMBER
+96^^http://www.w3.org/2001/XMLSchema#decimal
96
NUMBER
+65^^http://www.w3.org/2001/XMLSchema#decimal
65
NUMBER
+8^^http://www.w3.org/2001/XMLSchema#decimal
8
NUMBER
constellation
apparent magnitude
instance of