Thermal and Evolved Gas Analyzer


The Thermal and Evolved Gas Analyzer (TEGA) is a scientific instrument aboard the Phoenix spacecraft, a Mars lander which landed and operated on the planet Mars in 2008. TEGA's design is based on experience gained from the failed Mars Polar Lander. Soil samples taken from the Martian surface by the robot arm are eventually delivered to the TEGA, where they are heated in an oven to about 1,000 °C. This heat causes the volatile compounds to be given off as gases which are sent to a mass spectrometer for analysis. This spectrometer is adjusted to measure particularly the isotope ratios for oxygen, carbon, nitrogen, and heavier gases. Detection values are as low as 10 parts per billion. The Phoenix TEGA has 8 ovens, which are enough for 8 samples.

Thermal and Evolved Gas Analyzer

Major components:[1]

The soil was delivered to TEGA by a robotic arm with a scoop.[2]

Martian soil being delivered to TEGA

See alsoEdit


  1. ^ "TEGA - Phoenix 2007 Mars Scout Lander". Retrieved 2018-02-04.
  2. ^ Hoffman, J; Chaney, R; Hammack, H (2008-10-01). "Phoenix Mars Mission—The Thermal Evolved Gas Analyzer". Journal of the American Society for Mass Spectrometry. 19 (10): 1377–1383. doi:10.1016/j.jasms.2008.07.015. ISSN 1044-0305. PMID 18715800.

External linksEdit

  • Phoenix site description of TEGA
  • TEGA archives software