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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 HelpMeasurement range 241653.147431-241944.027431 MHz with a resolution of 1.000000 MHz. Molecular signatures included;


Properties of the atmosphere and the surface

Atmosphere Help   
Temperature profile     
Chemistry       Log10 of planet metallicity (dex, -1.0 to 3.0):
Surface pressure [bar] (0.008 to 90):    Ammount of CO2:
Oceanic coverage [%] (0 to 100):    Global Equivalent Layer (GEL) of liquid water [m] (0 to 2000):
Surface pressure:    Temperature [K]:       mv=12.0   FOMIR=1.0  FOMRadio=1.0
Mean molecular weight [g/mol]:

Type: LBL only
Abundance:    τ:

Atmospheric scattering aerosols Help    

Surface / Template properties Help           (Tequilibrium ~ 328K)
Temperature [K]:    Albedo:    Emissivity:    g(H-G):      Dust: