Mercury Fact Sheet - NASA
Mercury Observational Parameters Discoverer: Unknown Discovery Date: Prehistoric Distance from Earth Minimum (10 6 km) 77.3 Maximum (10 6 km) 221.9 Apparent diameter from Earth Maximum (seconds of arc) 13. Minimum (seconds of arc) 4.5 Maximum visual magnitude -2.43 Mean values at inferior conjunction with Earth Distance from Earth (10 6 km) 91.70 Apparent diameter …