Fig. 2: Comparison of ChaSTE Sensor S1(red) and S2 (green) observations with a nearby HK data (blue) from Vikram lander (sensor placed just above S1 on the ChaSTE deployment structure).

Comparison of temperatures reveals that the Sensor S1 is above the lunar surface and Sensor S2 being on the surface or few mm below. The maximum uncertainty in ChaSTE observations is ±0.5 K. Uncertainty of ±1 K in HK sensor data is plotted in the figure.