This site provides an interface to Goddard's Planetary Spectrum Generator (PSG), which can be used to generate high-resolution spectra of planetary bodies (e.g., planets, moons, comets, exoplanets). The spectroscopic suite can be also accessed remotely via the Application Program Interface (API). When requiring help on a specific input parameter, please click on the Help icon.

Calculation template Help
Target and geometry HelpTarget: C/2002 T7 for date (2004/05/10 12:00 UT); geometry: Observatory from 0.4588 AU.
Atmosphere and surface HelpProduction rate: 2.1600e+29 molecules/sec; Expansion velocity: 942.09 m/s; Atmospheric temperature: 76.8542 K; Gases: CH3OH; Surface temperature: 200.0000 K; Albedo: 0.0400; Emissivity: 0.9600;
Instrument parameters HelpWavelength range 241653.147431-241944.027431 MHz with a resolution of 1.000000 MHz. Molecular radiative-transfer enabled;

 

Instrument parameters


Telescope / instrument Help  
Frequency/wavelength range:    Resolution:
Include atmospheric signatures Help      Include continuum fluxes     Integrate stellar templates
Terrestrial transmittance Help  Apply    Multiply   Altitude/Water:
Radiation units: Help    Log plot
Telescope Help Beam [FWHM]:     Exozodi level:
 
Diameter [m, effective]:    Telescopes:  
Noise Help Time / exposure [s]:   Number of exposures:   Number of pixels:
 
NETD[mK]:   Speed[Hz]:   ηTotal, εopt, Topt[K]