51 Pegasi b
51 Pegasi b (abbreviated 51 Peg b), unofficially dubbed Bellerophon , later formally named Dimidium , is an extrasolar planet approximately 50 light-years away in the constellation of Pegasus. It was the first exoplanet to be discovered orbiting a main-sequence star, the Sun-like 51 Pegasi, and marked a breakthrough in astronomical research. It is the prototype for a class of planets called hot Jupiters.

In 2017, traces of water were discovered in the planet's atmosphere. In 2019, the Nobel Prize in Physics was awarded in part for the discovery of 51 Pegasi b.
Q189872
Bellerophon
MISC
Q44559
extrasolar planet
Concept
Q531
light-year
Concept
Q8928
constellation
Concept
Q8864
Pegasus
CEL
Q44559
exoplanet
Concept
Q4130
orbit
Concept
Q3450
main-sequence
Concept
Q112881
Sun-like
CEL
Q14265
51 Pegasi
CEL
None
prototype
UNK
Q382979
hot Jupiter
CEL
Q8104
atmosphere
Concept
Q38104
Nobel Prize in Physics
MEDIA
Q242309
51 Pegasi b
Concept
Q242309
51 Pegasi b
Concept
2017-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2017
DATE
2019-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2019
DATE
+51^^http://www.w3.org/2001/XMLSchema#decimal
51
NUMBER
+51^^http://www.w3.org/2001/XMLSchema#decimal
51
NUMBER
+50^^http://www.w3.org/2001/XMLSchema#decimal
50
NUMBER
+51^^http://www.w3.org/2001/XMLSchema#decimal
51
NUMBER
+51^^http://www.w3.org/2001/XMLSchema#decimal
51
NUMBER
instance of
constellation
instance of
parent astronomical body
instance of