Plaskett’s Star
E545073
Plaskett’s Star is a massive, highly luminous spectroscopic binary system composed of two very hot O-type stars, notable as one of the most massive known binary star systems in the Milky Way.
Observed surface forms (1)
| Surface form | Occurrences |
|---|---|
| Plaskett’s Star A | 0 |
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
O-type star binary
ⓘ
massive O-type star ⓘ massive binary star system ⓘ spectroscopic binary star system ⓘ |
| belongsTo | Monoceros OB association (approximate large-scale grouping) NERFINISHED ⓘ |
| hasAlternativeName |
BD+06 1309
NERFINISHED
ⓘ
HD 47129 NERFINISHED ⓘ HIP 31625 NERFINISHED ⓘ HR 2422 NERFINISHED ⓘ SAO 114010 NERFINISHED ⓘ V640 Monocerotis NERFINISHED ⓘ |
| hasApparentMagnitudeV | 6.06 ⓘ |
| hasColorIndexBminusV | approximately 0.0 to +0.1 (heavily reddened O-type) ⓘ |
| hasComponent |
Plaskett’s Star A
NERFINISHED
ⓘ
Plaskett’s Star B NERFINISHED ⓘ |
| hasDeclination | +06° 08′ (approximate) ⓘ |
| hasDiscoverer | John Stanley Plaskett NERFINISHED ⓘ |
| hasDiscoveryDate | early 20th century ⓘ |
| hasDiscoveryMethod | spectroscopic observation ⓘ |
| hasDistanceFromEarth |
about 1.6 kiloparsecs
ⓘ
about 5200 light-years ⓘ |
| hasEffectiveTemperature | over 30,000 K (each component, order of magnitude) ⓘ |
| hasEvolutionaryStatus | massive, evolved O-type stars ⓘ |
| hasGalacticPopulation | Population I ⓘ |
| hasLuminosity | several hundred thousand times solar luminosity (order of magnitude) ⓘ |
| hasMass |
about 50 solar masses (order of magnitude)
ⓘ
total system mass over 100 solar masses (approximate) ⓘ |
| hasOrbitalEccentricity | low (nearly circular orbit) ⓘ |
| hasOrbitalPeriod | about 14.4 days ⓘ |
| hasPhotometricVariabilityCause | ellipsoidal variations and wind effects ⓘ |
| hasPotentialFuture | likely core-collapse supernovae of components ⓘ |
| hasRadialVelocity | approximately +30 km/s (order of magnitude, variable) ⓘ |
| hasRightAscension | 06h 37m (approximate) ⓘ |
| hasSpectralType |
O7.5 III (secondary component, approximate)
ⓘ
O8 I (primary component, approximate) ⓘ |
| hasSpectroscopicBinaryType | double-lined spectroscopic binary ⓘ |
| hasStellarWind | strong ⓘ |
| hasStellarWindInteraction | colliding winds between components ⓘ |
| hasVariableStarDesignation | V640 Mon NERFINISHED ⓘ |
| hasXRayEmission | yes, from colliding winds ⓘ |
| isAmong | most massive known binary star systems in the Milky Way ⓘ |
| isVariableStar | true ⓘ |
| locatedIn |
Milky Way
ⓘ
constellation Monoceros NERFINISHED ⓘ |
| namedAfter | John Stanley Plaskett NERFINISHED ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.