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;