The mystery planet was located farthest to the west on December 23, 2016, at an azimuth value of 63°.
The mystery planet was discovered in 2011. It is currently located in the constellation Pegasus and has an apparent magnitude of 21.9, which means that it is extremely dim and difficult to see with an amateur telescope or binoculars.
The planet's orbit is elliptical, with a semimajor axis of 0.8 AU (Earth-Sun separation) and eccentricity 0.77. The orbital period is about 5 years and 11 months, making this one of the longest-period planets ever discovered in our solar system.
It takes about 3 years for the mystery planet to complete one orbit around its star; this orbital period is slightly shorter than Jupiter's orbital period (11 years), so it will complete one orbit in less time than it takes Jupiter to complete one orbit around our sun.
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