| Proper Name | Thatcher | | Designation | C/1861 G1 | | Orbital inclination to the Ecliptic | 79.8° | | Orbital Period | 415.5 years | | Distance from the Sun | Semi-Major Axis: 8,329,892,000 km (55.68 AU)
Perihelion: 137,735,000 km (0.92 AU)
Aphelion: 16,522,049,000 km (110.44 AU) | | Eccentricity | 0.9835 | | Notes | A comet orbiting the Sun well outside the plane of the Ecliptic with an exceptionally long period. Its last close approach to the Sun was in the year of its discovery, 1861, and the comet will not be seen again in the inner Solar System until its next perihelion in the year 2277. |
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