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;


Target and geometry parameters

Help UT yyyy/mm/dd hh:mm
Diameter [km]:        object
Distance to star [AU]:    Velocity to star [km/s]:   
Sub-solar longitude [E]:    Sub-solar latitude:    Season [LS]:
Parent star type Help    Star temperature [K]:    Star radius [Rsun]:

Viewing geometry Help    From:     Help Disk sub-sampling:
Beam [FWHM]:    Offsets [NS/EW]:
Sub-obs longitude [E]:   Sub-obs latitude:    Velocity to target [km/s]:
Distance:    Zenith angle[°]: