| Mean distance from Sun: | 0.39 Astronomical Units 57,900,000 km |
|---|---|
| Diameter: | 4,880 km |
| Mass: | 0.06 Earths |
| Density: | 5.4 grams per cubic centimeter |
| Surface temperature: | 800 F to -360 F |
| Orbital period: | 88 days |
| Rotational period: | 59 days |
Mercury is hard to see from Earth because it is so small and so close to the sun. At certain times of the year, it can be seen just after sunset or before sunrise. The rest of the time it is lost in the sun's glare.