Mercury at Aphelion

mercury at aphelion   Sunday February 21st the innermost planet Mercury reaches aphelion, its furthest distance from the Sun, 0.4667 AU, (69,817,326 km; 43,382,475 miles). Interestingly, I suppose, is that the next time Mercury reaches aphelion will be May 19th, 10 days after the Mercury transit of the Sun.

   All planets orbit the Sun with an orbital shape that is not circular but rather elliptical. How much away from being a circle is called eccentricity of an orbit. With 0 representing a circle and 1 a straight line Mercury, with an eccentricity of 0.2056, has the greatest eccentricity of the other 7 planets. The dwarf planet Pluto, for comparison, has an eccentricity of 0.2488.


Caution: Objects viewed with an optical aid are further than they appear.
Click here to go to the Qué tal in the Current Skies web site for more observing information for this month.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.