✦RADIOMETRIA THERMALIS
OBSERVED
NASA LRO DIVINER EXPERIMENT · THERMOPHYSICAL EQUILIBRIUM

The Thermal Moon

Thermophysical surface equilibrium modeling across the 14-day lunar day/night cycle, regolith thermal inertia, and permanently shadowed polar cold traps (PSRs).

LRO Diviner Lunar Radiometer ExperimentDiscipline: 02 // ASTRONOMIC

RADIOMETRIA THERMALIS · GUIDED SUNLINE

The Moon keeps the Sun’s ledger.

Follow one illumination vector from direct heating to the coldest shadows in the Solar System.

01 · SOLAR VECTOR

On the Moon, the Sun is a moving instrument.

With no atmosphere to distribute heat, the local solar angle becomes the first variable. Move the sub-solar longitude and the illumination vector sweeps across the selected site.

TARGET SELENOGRAPHIC SITE0.674° / 23.473°
Surface equilibrium390.5 K
10 cm regolith271.1 K
SUB-SOLAR LONGITUDE23.473° · solar altitude 89.33°
FARSIDE NOONNEARSIDE CENTERFARSIDE NOON
Diviner thermal traceExtreme Noon Heating
Tranquility Base (Apollo 11)390.5 K SURFACE−180°0° LOCAL SUN+180°
Solar altitude89.33°incident vector
Volatile statusHyper-Volatile Boiling

Thermal reading

Extreme Noon Heating

Surface 117.3°C · subsurface damping 119.4 K.

The selected site and illumination vector drive the entire thermal trace.

The Thermal Moon: LRO Diviner Radiometry Engine

Real-time thermophysical surface modeling across 14-day lunar day/night transitions and polar volatile cold-traps.

OBSERVED
Target Selenographic Site:
Equilibrium Surface Temperature
390.5 K
117.3°C / 243.1°F
Regime: Extreme Noon Heating
10cm Depth: 271.1 KSolar Alt α_⊙: 89.33°
Scrub Sun Angle Across Lunation (Sub-Solar Longitude):23.473° Longitude
-180° (Farside Noon)0° (Nearside Center Noon)+180° (Farside Noon)
Volatile / Water Ice Stability at Coordinates
Hyper-Volatile Boiling

At temperatures below 110 Kelvin, water ice sublimation rate is < 1 meter per billion years. Temperatures above 150 Kelvin cause rapid explosive degassing to vacuum.