Beta Cephei triple star system
GPTKB entity
Statements (28)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
binary star system
|
| gptkbp:apparentMagnitude |
3.23
|
| gptkbp:catalogueNumber |
gptkb:HR_8238
gptkb:HD_205021 gptkb:HIP_106032 |
| gptkbp:component |
gptkb:Beta_Cephei_A
gptkb:Beta_Cephei_B |
| gptkbp:declination |
+70° 33′ 38″
|
| gptkbp:discoveredBy |
gptkb:William_Herschel
|
| gptkbp:discoveredIn |
1782
|
| gptkbp:distanceFromEarth |
690 light years
|
| https://www.w3.org/2000/01/rdf-schema#label |
Beta Cephei triple star system
|
| gptkbp:locatedIn |
gptkb:constellation_Cepheus
|
| gptkbp:luminosity |
~15,000 times Sun
|
| gptkbp:massOfPrimary |
~12 solar masses
|
| gptkbp:orbitalPeriodOfInnerPair |
81.4 years
|
| gptkbp:orbitalPeriodOfOuterComponent |
~90,000 years
|
| gptkbp:otherName |
gptkb:Alfirk
|
| gptkbp:parallax |
4.74 mas
0.15 mas |
| gptkbp:properMotionRA |
+0.13 mas/yr
+16.86 mas/yr |
| gptkbp:rightAscension |
21h 28m 39.6s
|
| gptkbp:spectralType |
B2III
|
| gptkbp:tertiaryComponent |
gptkb:Beta_Cephei_C
|
| gptkbp:variableStar |
gptkb:Beta_Cephei_variable
|
| gptkbp:bfsParent |
gptkb:Beta_Cephei_C
|
| gptkbp:bfsLayer |
8
|