Delta1 Gruis
Delta1 Gruis, Latinized from δ1 Gruis, is a candidate binary star system in the constellation Grus. With a peak apparent visual magnitude of 3.97, it is bright enough to be seen with the naked eye at night. The distance to this system, as determined using an annual parallax shift of 10.54 mas as seen from the Earth, is around 309 light years. It is gradually moving away from the Sun with a radial velocity of +4.9 km/s.

The brighter component of this system is an evolved, yellow-hued, G-type giant star with a stellar classification of G6/8 III. It is a semiregular variable that ranges between apparent magnitudes 3.99 and 4.2, located 325 light-years from Earth. Delta1 Gruis has around 3 times the mass and 135 times the diameter of the Sun. The fainter companion is a magnitude 12.8 star at an angular separation of 5.6 arc seconds, as of 2008.
Q1806983
Latinized
UNK
Q50053
binary star
Concept
Q8928
constellation
Concept
Q10563
Grus
CEL
Q124313
apparent visual magnitude
Concept
Q165074
parallax
Concept
Q12097402
mas
Concept
Q531
light year
Concept
Q240105
radial velocity
Concept
Q6472
evolved
Concept
Q25377588
G-type
Concept
Q5875
giant star
Concept
Q25377588
stellar classification
Concept
Q1054411
semiregular variable
CEL
Q124313
apparent magnitude
Concept
Q525
Sun
CEL
Q1357788
angular separation
Concept
Q12097402
arc second
Concept
Q5175002
Delta1 Gruis
CEL
Q5175002
Delta1 Gruis
CEL
2008-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2008
DATE
+1^^http://www.w3.org/2001/XMLSchema#decimal
1
NUMBER
+1^^http://www.w3.org/2001/XMLSchema#decimal
1
NUMBER
+3.97^^http://www.w3.org/2001/XMLSchema#decimal
3.97
NUMBER
+10.54^^http://www.w3.org/2001/XMLSchema#decimal
10.54
NUMBER
++4.9^^http://www.w3.org/2001/XMLSchema#decimal
+4.9
NUMBER
+6^^http://www.w3.org/2001/XMLSchema#decimal
6
NUMBER
+8^^http://www.w3.org/2001/XMLSchema#decimal
8
NUMBER
+3.99^^http://www.w3.org/2001/XMLSchema#decimal
3.99
NUMBER
+4.2^^http://www.w3.org/2001/XMLSchema#decimal
4.2
NUMBER
+1^^http://www.w3.org/2001/XMLSchema#decimal
1
NUMBER
+3^^http://www.w3.org/2001/XMLSchema#decimal
3
NUMBER
+12.8^^http://www.w3.org/2001/XMLSchema#decimal
12.8
NUMBER
+5.6^^http://www.w3.org/2001/XMLSchema#decimal
5.6
NUMBER
constellation
apparent magnitude
type of variable star
mass
instance of