Surface gravity depends on the distance from a spot on the surface to the center of a body's mass. The Erotian surface gravity changes a lot, since Eros is not a sphere but a stretched peanut-shaped (or potato- or shoe-shaped) object. The daytime temperature on Eros stays at about 100 °C and nighttime measurements at −150 °C. Eros's density is 2,400 kg/m, about the same as the density of Earth's crust. Its day lasts 5.27 hours.