Transit of Mercury from Mars
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A transit of Mercury across the Sun as seen from Mars takes place when the planet Mercury passes directly between the Sun and Mars, obscuring a small part of the Sun's disc for an observer on Mars. During a transit, Mercury can be seen from Mars as a small black disc moving across the face of the Sun.
Transits of Mercury from Mars are much more common than transits of Mercury from Earth: there are several per decade.
No one has ever seen a transit of Mercury from Mars, but they could be observed by future Mars colonists.
The Mars Rovers Spirit and Opportunity could have observed the transit on January 12, 2005 (from 14:45 UTC to 23:05 UTC); however the only camera available for this had insufficient resolution. They were able to observe transits of Deimos across the Sun, but at 2' angular diameter, Deimos is about 20 times larger than Mercury's 6.1" angular diameter. Ephemeris data generated by JPL Horizons indicates that Opportunity would be able to observe the transit from the start until local sunset at about 19:23 UTC Earth time, while Spirit would be able to observe it from local sunrise at about 19:38 UTC until the end of the transit.
The Mercury-Mars synodic period is 100.888 days. It can be calculated using the formula 1/(1/P-1/Q), where P is the orbital period of Mercury (87.969 days) and Q is the orbital period of Mars (686.98 days).
The inclination of Mercury's orbit with respect to Mars' ecliptic is 5.16°, which is less than its value of 7.00° with respect to Earth's ecliptic.
| Transits 2000–2035 | |
|---|---|
| December 18, 2003 | |
| January 12, 2005 | |
| November 23, 2005 | |
| May 10, 2013 | |
| June 4, 2014 | |
| April 15, 2015 | |
| October 25, 2023 | |
| September 5, 2024 | |
| January 26, 2034 | |
| February 21, 2035 | |
Contents |
[edit] Transit visibility table
[edit] See also
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[edit] References
- Albert Marth, Note on the Transit of the Earth and Moon across the Sun’s Disk as seen from Mars on November 12, 1879, and on some kindred Phenomena, Monthly Notices of the Royal Astronomical Society, 39 (1879), 513–514. [1]
- Giorgini, J.D., Yeomans, D.K., Chamberlin, A.B., Chodas, P.W., Jacobson, R.A., Keesey, M.S., Lieske, J.H., Ostro, S.J., Standish, E.M., Wimberly, R.N., "JPL's On-Line Solar System Data Service", Bulletin of the American Astronomical Society 28(3), 1158, 1996.
[edit] External links
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