1 Vulpeculae
1 Vulpeculae is a class B4IV (blue subgiant) star in the constellation Vulpecula. Its apparent magnitude is 4.77 and it is approximately 780 light years away based on parallax.

The primary was discovered to be a spectroscopic binary in 1978 with a period around 250 days although the orbital elements are described as marginal. There are also companions B, with magnitude 11.6 and separation 39.1", and C, with magnitude 12.8 and separation 43.6".

Component A is also a suspected variable star, reported to vary from 4.57 to 4.77 in magnitude. It was reported as possibly variable in 1952 during a search for β CMa variables, but has not been seen to vary since. It was listed as one of the least variable stars based on Hipparcos photometry.

On the 29 May 1983, 1 Vulpeculae was occulted by the asteroid Pallas. This event was observed at 130 locations in the United States and Mexico and was the best observed of all asteroid occultation events.
Q523
star
Concept
Q8928
constellation
Concept
Q10519
Vulpecula
CEL
Q50053
spectroscopic binary
Concept
Q272626
orbital elements
Concept
Q764463
β CMa variables
CEL
Q555846
Hipparcos
MISC
Q3002
Pallas
CEL
None
asteroid occultation
UNK
Q3320539
1 Vulpeculae
CEL
Q3320539
1 Vulpeculae
CEL
1978-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1978
DATE
1952-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1952
DATE
1983-05-29T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
29 May 1983
DATE
+1^^http://www.w3.org/2001/XMLSchema#decimal
1
NUMBER
+4^^http://www.w3.org/2001/XMLSchema#decimal
4
NUMBER
+4.77^^http://www.w3.org/2001/XMLSchema#decimal
4.77
NUMBER
+11.6^^http://www.w3.org/2001/XMLSchema#decimal
11.6
NUMBER
+39.1^^http://www.w3.org/2001/XMLSchema#decimal
39.1
NUMBER
+12.8^^http://www.w3.org/2001/XMLSchema#decimal
12.8
NUMBER
+43.6^^http://www.w3.org/2001/XMLSchema#decimal
43.6
NUMBER
+4.57^^http://www.w3.org/2001/XMLSchema#decimal
4.57
NUMBER
+4.77^^http://www.w3.org/2001/XMLSchema#decimal
4.77
NUMBER
+1^^http://www.w3.org/2001/XMLSchema#decimal
1
NUMBER
instance of
constellation
apparent magnitude
apparent magnitude
instance of