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The @stro object for the week of 9/27/1999

image of Mercury

image courtesy of SEDS

Mercury. Mercury is the closest planet to our Sun. When visible from our perspective it can be difficult to observe because its always close to the Sun. This planet's surface temperature varies from 90-700 Kelvin. While it closely resembles our Moon, it is much more dense. Current physical information (northern hemisphere):

Rise: 6h41m PST
Set: 18h4m PST
Magnitude: -0.4
Phase: 91.2%

more info...

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