Transit of Mercury from Uranus
- Transit of Mercury from Uranus
A transit of Mercury across the Sun as seen from Uranus takes place when the planet Mercury passes directly between the Sun and Uranus, obscuring a small part of the Sun's disc for an observer on Uranus. During a transit, Mercury can be seen from Uranus as a small black disc moving across the face of the Sun.
Naturally, no one has ever seen a transit of Mercury from Uranus, nor is this likely to happen in the foreseeable future. Nevertheless, the next one will take place on October 26, 2020.
A transit could be observed from the surface of one of Uranus' moons rather than from Uranus itself. The times and circumstances of the transits would naturally be slightly different.
The Mercury-Uranus synodic period is 88.221 days. It can be calculated using the formula 1/(1/P-1/Q), where P is the sidereal orbital period of Mercury (87.969 days) and Q is the orbital period of Uranus (30,799.095 days).
Transits of Mercury from Uranus are empirically observed to occur in clusters, with two such clusters every 40 years or so.
References
ee also
* Astronomical transit
External links
* [http://ssd.jpl.nasa.gov/?horizons JPL Horizons]
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