Barycentric Dynamical Time
E497212
Barycentric Dynamical Time is a relativistic time scale used in celestial mechanics and ephemerides, defined for an observer at the solar system’s barycenter to accurately model planetary and spacecraft motions.
Statements (44)
| Predicate | Object |
|---|---|
| instanceOf |
astronomical time standard
ⓘ
coordinate time scale ⓘ relativistic time scale ⓘ |
| abbreviation | TDB ⓘ |
| accountsFor |
gravitational time dilation
ⓘ
relativistic effects in the solar system ⓘ special relativistic time dilation ⓘ |
| category |
Celestial mechanics
ⓘ
Relativity in astronomy ⓘ Time in astronomy ⓘ |
| closelyMatches | Terrestrial Time NERFINISHED ⓘ |
| coordinateOrigin | solar system barycenter ⓘ |
| definedBy | International Astronomical Union NERFINISHED ⓘ |
| definedForObserverAt | solar system barycenter ⓘ |
| definedIn | IAU 1976 system of astronomical constants NERFINISHED ⓘ |
| definedOnGeoid | no ⓘ |
| differenceFrom | Terrestrial Time is periodic and small ⓘ |
| domain | solar system dynamics ⓘ |
| epochReference | Julian Date ⓘ |
| hasNature | theoretical coordinate time rather than directly observable time ⓘ |
| maintainedBy |
Bureau des Longitudes
NERFINISHED
ⓘ
Jet Propulsion Laboratory NERFINISHED ⓘ |
| measuredIn | SI seconds ⓘ |
| referenceFrame | barycentric celestial reference system ⓘ |
| refinedBy | IAU 2006 resolutions NERFINISHED ⓘ |
| relatedTo |
Barycentric Coordinate Time
NERFINISHED
ⓘ
Terrestrial Time via relativistic transformation ⓘ |
| replacedInPracticeBy | Barycentric Coordinate Time for theoretical work ⓘ |
| successorOf | Ephemeris Time NERFINISHED ⓘ |
| symbol | TDB ⓘ |
| timeArgumentOf |
planetary motion models
ⓘ
solar system dynamical theories ⓘ spacecraft trajectory models ⓘ |
| typicalOffsetMagnitude | on the order of milliseconds relative to Terrestrial Time ⓘ |
| usedAsTimeArgumentIn |
INPOP ephemerides
ⓘ
JPL planetary ephemerides NERFINISHED ⓘ |
| usedFor |
accurate modeling of planetary motions
ⓘ
accurate modeling of spacecraft motions ⓘ timing of observations of solar system bodies ⓘ |
| usedIn |
celestial mechanics
ⓘ
high‑precision astrometry ⓘ planetary ephemerides ⓘ solar system ephemerides ⓘ spacecraft navigation ⓘ |
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Terrestrial Time