Gliese 581g
E939826
exoplanet candidate
hypothetical planet
potentially habitable exoplanet candidate
unconfirmed exoplanet
Gliese 581g is a controversial, unconfirmed exoplanet candidate once thought to be a potentially habitable, Earth-like world orbiting the red dwarf star Gliese 581.
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
exoplanet candidate
ⓘ
hypothetical planet ⓘ potentially habitable exoplanet candidate ⓘ unconfirmed exoplanet ⓘ |
| announced | September 2010 ⓘ |
| announcedBy | Lick–Carnegie Exoplanet Survey team NERFINISHED ⓘ |
| catalogStatus | often omitted from conservative exoplanet catalogs ⓘ |
| confirmationStatus |
controversial
ⓘ
unconfirmed ⓘ |
| constellation | Libra NERFINISHED ⓘ |
| controversyReason |
sensitivity of detection to data selection and noise modeling
ⓘ
weak radial-velocity signal near detection limits ⓘ |
| dataSource |
HARPS spectrograph radial-velocity data (reanalysed)
ⓘ
HIRES spectrograph on the Keck I telescope ⓘ |
| discoverer |
R. Paul Butler
NERFINISHED
ⓘ
Steven S. Vogt NERFINISHED ⓘ |
| discoveryMethod | radial velocity ⓘ |
| distanceFromEarth | about 20.3 light-years ⓘ |
| equilibriumTemperature | estimated to allow liquid water under suitable atmospheric conditions ⓘ |
| existenceStatus | disputed ⓘ |
| followUpAnalysis |
some analyses attribute the signal to stellar activity or noise
ⓘ
subsequent studies failed to confirm the signal ⓘ |
| habitabilityStatus | potentially habitable (if real) ⓘ |
| hostStar | Gliese 581 NERFINISHED ⓘ |
| hostStarSpectralType | M3V ⓘ |
| hostStarType | red dwarf ⓘ |
| mediaImpact | widely publicized as a potentially Earth-like world ⓘ |
| minimumMass | about 3.1 Earth masses ⓘ |
| notableFor | being among the first exoplanet candidates labeled “Goldilocks” or “just right” for life ⓘ |
| orbitalPeriod | about 37 days ⓘ |
| orbitalResonanceStatus | no secure resonance with other Gliese 581 planets established ⓘ |
| orbitalZone | habitable zone of Gliese 581 ⓘ |
| planetType | super-Earth candidate ⓘ |
| potentialForLiquidWater | possible on parts of the surface under suitable atmosphere assumptions ⓘ |
| publicPerception | sometimes still cited in popular media as an Earth-like planet despite doubts ⓘ |
| relatedObject |
Gliese 581c
NERFINISHED
ⓘ
Gliese 581d NERFINISHED ⓘ Gliese 581e NERFINISHED ⓘ Gliese 581f NERFINISHED ⓘ |
| researchStatus | no independent confirmation as of 2024 ⓘ |
| scientificDebate |
sparked debate over statistical methods in exoplanet detection
ⓘ
used as a case study in false-positive exoplanet claims ⓘ |
| semiMajorAxis | about 0.13 AU ⓘ |
| starSystem | Gliese 581 system NERFINISHED ⓘ |
| surfaceGravity | estimated to be similar to or somewhat higher than Earth’s ⓘ |
| tidalLockingStatus | likely tidally locked if it exists ⓘ |
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.