J band
E666542
The J band is a near-infrared wavelength range commonly used in astronomical observations to study cooler stars, brown dwarfs, and dust-obscured regions of space.
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
astronomical photometric band
ⓘ
near-infrared band ⓘ |
| advantage |
allows observation of objects in heavily reddened regions
ⓘ
less affected by interstellar dust extinction than optical bands ⓘ |
| associatedWith |
2MASS survey
NERFINISHED
ⓘ
UKIRT Infrared Deep Sky Survey NERFINISHED ⓘ VISTA surveys NERFINISHED ⓘ |
| calibratedUsing | standard stars with known J magnitudes ⓘ |
| centralWavelength |
1.25 micrometres
ⓘ
1250 nanometres ⓘ |
| domain |
astrophysics
ⓘ
observational astronomy ⓘ |
| electromagneticSpectrumRegion | near-infrared ⓘ |
| filterType | broadband filter ⓘ |
| frequencyRange | approximately 214–273 terahertz ⓘ |
| limitation |
affected by atmospheric absorption features
ⓘ
sky background emission in near-infrared ⓘ |
| measurementUnit | magnitude ⓘ |
| observedWith |
ground-based infrared telescopes
ⓘ
space-based infrared observatories ⓘ |
| observes |
stellar photospheric emission of cool stars
ⓘ
thermal emission from warm dust ⓘ |
| partOf |
JHK photometric system
NERFINISHED
ⓘ
near-infrared photometric system ⓘ |
| relatedBand |
H band
ⓘ
K band ⓘ |
| requires |
cryogenically cooled instrumentation
ⓘ
infrared-sensitive detectors ⓘ |
| standardSystem |
2MASS photometric system
NERFINISHED
ⓘ
Johnson photometric system NERFINISHED ⓘ |
| symbol | J ⓘ |
| typicalBandwidth | about 0.3 micrometres ⓘ |
| usedFor |
characterizing brown dwarf spectral energy distributions
ⓘ
determining stellar temperatures ⓘ measuring color indices with H and K bands ⓘ probing the structure of the Milky Way ⓘ studying high-redshift galaxies in rest-frame optical ⓘ |
| usedIn |
astronomical photometry
ⓘ
infrared astronomy ⓘ |
| usedToStudy |
brown dwarfs
ⓘ
cool stars ⓘ dust-obscured regions of space ⓘ extragalactic objects ⓘ galactic structure ⓘ star-forming regions ⓘ |
| wavelengthRange |
approximately 1.1–1.4 micrometres
ⓘ
approximately 1100–1400 nanometres ⓘ |
| zeroPointDefinition | often tied to Vega magnitude system ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.