Uranus at East Quadrature

Uranus at East Quadrature

Uranus at East Quadrature

   Ok- as having once taught middle school grades 6 through 8 I have always enjoyed this part of the lessons about the solar system. That is, when I can explain to students about a debate over the pronunciation of this particular planet. Of course saying ‘Your Uh Nuss’ is not as humorous as the kids preferred ‘Your Anus’! I like to describe this debate (with tongue in cheek), that there are two sides to the pronunciation debate – sort of split down the middle if you will. Eventually we get to the planet and its characteristics. Eventually.
Uranus in the Evening Sky

Uranus in the Evening Sky

   So what about this East Quadrature? This is a position of an outer planet with respect to the location of the Earth and the Sun. Outer planets at eastern quadrature are located at a 90o angle from the Earth and the Sun as shown in the first graphic above. This is one of the three positions that are used to describe an outer planet location during the Earth’s orbit around the Sun — not the outer planet’s orbit. An outer planet will be at eastern quadrature, then approximately 3 months later at opposition (Uranus-Earth-Sun), 3 months later at western quadrature, 3 months later at superior conjunction (Earth-Sun-Uranus), then the pattern repeats.
Uranus in Motion

Uranus in Motion

   So where exactly is Uranus (the correct answer is not behind you!!)? This outer planet currently rises before sunset local time and is over the southern horizon as shown in the second graphic above. It is too dim to be seen with the naked eye, or at least right at the fringes of what we can see – so if your skies are really dark then you may be able to discern the faint glow of reflected sunlight from Uranus.
   With binoculars it will become, in a sense, one of the stars in your binocular field of view. In this simulated 7×50 binocular view Uranus is slightly brighter that the 6th magnitude stars nearby. To verify that you are actually viewing Uranus use this animated graphic as a star field guide. Wait a couple of weeks to allow the slower moving planet to move in its orbit. Then observe this same area to see if there have been any changes. This graphic starts with the Uranus near a pair of equal in brightness stars on 26 November. The graphic dissolves into showing the position of Neptune today, and then dissolves one last time to show where Uranus is with respect to the pair of stars.

   Here is a couple minute long clip from a video I produced that was used during a live music performance by the group Dark Matter under a 60-foot diameter planetarium dome.

Click here to go to the Qué tal in the Current Skies web site for more observing information.

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