C/1955 L1 (Mrkos)
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          Comet Mrkos photographed by Elizabeth Roemer from the Lick Observatory on 17 June 1955.  | |
| Discovery | |
|---|---|
| Discovered by | Antonín Mrkos | 
| Discovery site | Lomnický štít, Czechoslovakia | 
| Discovery date | 12 June 1955 | 
| Designations | |
| 1955 III, 1955e | |
| Orbital characteristics | |
| Epoch | 14 July 1955 (JD 2435302.5) | 
| Observation arc | 84 days | 
| Number of observations  | 21 | 
| Aphelion | 98.547 AU | 
| Perihelion | 0.534 AU | 
| Semi-major axis | 49.540 AU | 
| Eccentricity | 0.98921 | 
| Orbital period | ~350 years | 
| Inclination | 86.503° | 
| 48.942° | |
| Argument of periapsis  | 32.506° | 
| Mean anomaly | 0.113° | 
| Last perihelion | 4 June 1955 | 
| Next perihelion | ~2300s | 
| TJupiter | 0.160 | 
| Earth MOID | 0.399 AU | 
| Jupiter MOID | 0.192 AU | 
| Physical characteristics | |
| Comet nuclear magnitude (M2)  | 6.6 | 
| 4.5 (1955 apparition)  | |
Comet Mrkos, formally designated as C/1955 L1, is a long-period comet with an approximately 350-year orbit around the Sun. It is one of several comets discovered by Czech astronomer, Antonín Mrkos.