| Proper Name | Perrine-Mrkos | | Designation | 18D | | Orbital inclination to the Ecliptic | 17.66° | | Orbital Period | 17 years, 237 days | | Distance from the Sun | Semi-Major Axis: 580,721,000 km (3.88 AU)
Perihelion: 238,398,000 km (1.59 AU)
Aphelion: 923,045,000 km (6.17 AU) | | Eccentricity | 0.5895 | | Notes | This faint comet was originally discovered in 1896, but after it return to the inner Solar System in 1909 it was lost to observers on Earth. It was not until 1955 that the comet was rediscovered, and then observed again on its subsequent orbital return, but Comet Perrine-Mrkos has not been detected since. |
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