Jupiter Backs Up!

   Friday March 9th the outer ringed planet Jupiter stops its regular direct motion to the east and begins to move in retrograde toward the west. Retrograde motion for any planet further from the Sun then the Earth, that we observe from Earth, is an apparent motion of that planet caused by the faster moving Earth along its orbital path. As the Earth catches up and passes an outer planet that planet appears to move toward the west. Depending on the planet the retrograde motion may last a few weeks or months. Jupiter will be within the boundaries of the constellation Libra the Scales.

   Jupiter along with Mars and Saturn all rise before sunrise local time and the morning skies on March 9th the 21-day old last quarter Moon will be about 7o from the ‘red planet’ Mars.

   Follow the planet by way of its coordinates using just right ascension with the free equatorial star chart from Stephen F. Austin University.

Date Right Ascension
(Hours – Minutes)
June 5            14 52
June 15         14 48
June 25         14 46
July 5            14 45
July 15            14 44
July 25            14 46
August 4          14 48
August 14         14 51
August 24         14 55
September 3      15 00


Click here to go to the Qué tal in the Current Skies web site for monthly observing information, or here to return to bobs-spaces.

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