The surface temperature of Europa.

Area of Science:

• Planetary Science
• Astrobiology
• Astrophysics

Background:

• Previous surface temperature estimates for Jupiter's moon Europa were incomplete.
• Existing models often overlooked key factors like orbital eccentricity and internal heat.

Purpose of the Study:

• To systematically estimate Europa's diurnal, seasonal, and annual mean surface temperatures.
• To incorporate previously neglected factors into temperature modeling.

Main Methods:

• Developed a comprehensive model accounting for Europa's obliquity, emissivity, heat capacity, and eclipse.
• Included effects of Jupiter's radiation, internal heating, and orbital eccentricity.
• Estimated incoming solar radiation for Saturn's moon Enceladus.

Main Results:

• Calculated mean annual surface temperatures: 96 K (equator), 46 K (pole), and 90 K (global).
• Internal heating significantly impacts high-latitude temperatures, especially during winter.
• High-latitude temperature measurements can constrain internal heating rates.

Conclusions:

• This comprehensive model provides a more accurate estimation of Europa's surface temperatures.
• Internal heating is a critical factor for understanding temperature variations, particularly at high latitudes.
• Findings aid in future exploration and astrobiological assessments of Europa.