 Comet Brooks photographed byPaul L. Anderson shortly before its last perihelion, 19 October 1911 | |
| Discovery | |
|---|---|
| Discovered by | William R. Brooks |
| Discovery site | Smith Observatory[1] |
| Discovery date | 21 July 1911 |
| Designations | |
| 1911c 1911 V | |
| Orbital characteristics[2] | |
| Epoch | 27 August 1911 (JD 2419275.5) |
| Observation arc | 10 days |
| Number of observations | 8 |
| Aphelion | 78.6906 AU |
| Perihelion | 0.48982 AU |
| Semi-major axis | 39.5902 AU |
| Eccentricity | 0.98763 |
| Orbital period | 249.109 years |
| Inclination | 33.8095° |
| 293.704° | |
| Argument of periapsis | 153.557° |
| Last perihelion | 28 October 1911 |
| Next perihelion | ~2160 |
| TJupiter | 0.854 |
| EarthMOID | 0.4167 AU |
| JupiterMOID | 0.4506 AU |
| Physical characteristics | |
| 2.0[3] (1911 apparition) | |
C/1911 O1 (Brooks), also designated1911 V orComet Brooks, was a brightcomet discovered in July 1911 by astronomerWilliam Robert Brooks.
It is notable for becoming a bright naked-eye object of secondmagnitude, with a narrow straight tail of up to thirty degrees in length and a distinct blue colour;[3] this colour seen in some comets is usually a result of the emission ofcarbon monoxide ions. It was also notable for uniquely being visible at the same time (mid October 1911) and in the same part of the sky as a second bright comet; this wasC/1911 S3 (Beljawsky), which reached the first magnitude, had a fifteen degree tail and a bright golden-yellow appearance.[3]
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