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/2007 W1 for date (2008/07/09 15:10 UT); geometry: Observatory from 0.3484 AU.
Atmosphere and surface HelpProduction rate: 8.1900e+27 molecules/sec; Expansion velocity: 846.67 m/s; Atmospheric temperature: 81.5102 K; Gases: CH4,C2H6,CH3OH; Surface temperature: 200.0000 K; Albedo: 0.0400; Emissivity: 0.9600;
Instrument parameters HelpWavelength range 2959.311375-3006.935775 cm with a resolution of 25000.000000 RP. Molecular radiative-transfer enabled; Continuum flux module enabled;


Retrieval parameters

Retrieval data Help  
Levenberg-Marquardt parameter (γ): Help
Frequency/wavelength unit:     Instrument's resolution [FWHM]:
Radiation unit: Help    Data scaling factor:
Beam [FWHM]:
Data include continuum fluxes?    
Telluric Help  Apply    Multiply   Altitude/Water:   Fit telluric?
Fit gain function?   Degree:   Photometric:
Remove residual offset?   Degree of polynomial:
Remove spectral fringes?   Number of fringes:
Fit solar/stellar features?
Fit spectral calib.?    Shift:
Fit spectral resolution?
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