The daytime temperature on Eros hovers at about 100 Â C and nighttime measurements at â ' 150 Â C. Eros 's density is 2,400 kg\/m3 , about the same as the density of Earth 's crust . The daytime temperature on Eros can reach about 100 Â C at perihelion . Nighttime measurements fall near -150 Â C. Eros 's density is 2,400 kg\/m3 , about the same as the density of Earth 's crust .