C/1909 L1 (Borrelly–Daniel)
Non-periodic comet
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Comet Borrelly–Daniel, formally designated as C/1909 L1, is a non-periodic comet that was co-discovered by astronomers, Alphonse Borrelly and Zaccheus Daniel. It was the seventh comet discovery by Borrelly and the third one for Daniel.[a] About two weeks prior to discovery, the comet made its closest approach to Earth at a distance of 0.852 AU (127.5 million km) on 30 May 1909.[4]
Comet Borrelly–Daniel photographed by Max Planck from the Heidelberg Observatory on 9 March 1910 | |
| Discovery[1] | |
|---|---|
| Discovered by | Alphonse Borrelly Zaccheus Daniel |
| Discovery site | Marseille, France Princeton, USA |
| Discovery date | 15–16 June 1909 |
| Designations | |
| 1909 I, 1909a[2] | |
| Orbital characteristics[3] | |
| Epoch | 8 July 1909 (JD 2418495.5) |
| Observation arc | 42 days |
| Number of observations | 29 |
| Aphelion | ~350 AU |
| Perihelion | 0.843 AU |
| Semi-major axis | ~175 AU |
| Eccentricity | 0.99519 |
| Orbital period | ~2,320 years |
| Inclination | 52.081° |
| 306.88° | |
| Argument of periapsis | 5.000° |
| Mean anomaly | 0.014° |
| Last perihelion | 5 June 1909 |
| TJupiter | 0.728 |
| Earth MOID | 0.171 AU |
| Jupiter MOID | 2.861 AU |
| Physical characteristics[4] | |
| Comet total magnitude (M1) | 10.9 |
| 9.0 (1909 apparition) | |
