Comet Arend–Roland
Comet Arend-Roland photographed from the Palomar Observatory on 27 April 1957 | |
| Discovery | |
|---|---|
| Discovered by | Sylvain Arend Georges Roland |
| Discovery site | Uccle Obs, Belgium |
| Discovery date | 6 November 1956 |
| Designations | |
| 1957h 1956 III | |
| Orbital characteristics | |
| Epoch | 9 July 1957 (JD 2436028.5) |
| Observation arc | 497 days (1.36 days) |
| Number of observations | 57 |
| Orbit type | Oort cloud / Hyperbolic |
| Perihelion | 0.31604 AU |
| Eccentricity | 1.000199 |
| Inclination | 119.94° |
| 215.86° | |
| Argument of periapsis | 308.77° |
| Last perihelion | 8 April 1957 |
| Next perihelion | ejection |
| Earth MOID | 0.239 AU |
| Jupiter MOID | 1.610 AU |
| Physical characteristics | |
Mean radius | 1.58 km (0.98 mi) |
| Comet total magnitude (M1) | 5.4 |
| –0.5 (1957 apparition) | |
Comet Arend–Roland was discovered on November 6, 1956, by Belgian astronomers Sylvain Arend and Georges Roland on photographic plates. As the eighth comet found in 1956, it was named Arend–Roland 1956h after its discoverers. Because it was the third comet to pass through perihelion during 1957, it was then renamed 1957 III. Finally, it received the standard IAU designation C/1956 R1 (Arend–Roland), with the "C/" indicating that it was a non-periodic comet and the "R1" showing that it was the first comet reported as discovered in the half-month designated by "R". The last is equivalent to the period September 1–15.