Thermal alteration and differential sublimation can create Phaethon's “rock comet” activity and blue color

In 2010 Jewitt and Li published a paper examining the behavior of comet-asteroid transition object 3200 Phaethon, arguing it was asteroid-like in its throughout most orbit, but that near perihelion, at distance only 0.165 AU from sun, dayside temperatures would be hot enough to vaporize rock (>1000 K, Hanus et al. 2016). Thus act like "rock comet" as gases produced evaporating were released body, manner similar more familiar sublimation water ice into vacuum seen for comets coming within ~3 Sun. this Note we predict same thermal effects create with Qgas ~ 10$^{22}$ mol/sec perihelion also help greatly bluen Phaethon's surface via preferential alteration sublimative removal Fe refractory organics, known reddening darkening agents. These predictions are testable by searching signs spectral bluening surfaces other objects Phaethon-like small orbits, situ measurements Phaethons coma composition upcoming DESTINY+ mission Phaethon JAXA.