167P/CINEOS
167P/CINEOS (P/2004 PY42) is a large periodic comet and active, grey centaur, approximately 66 kilometers (41 miles) in diameter, orbiting the Sun outside the orbit of Saturn. It was discovered on August 10, 2004, by astronomers with the CINEOS survey at Gran Sasso in Italy. It is one of only a handful known Chiron-type comets.
| Discovery | |
|---|---|
| Discovered by | CINEOS |
| Discovery date | August 10, 2004 |
| Designations | |
| P/2004 PY42 | |
| Orbital characteristics | |
| Epoch | 2066-03-11 |
| Observation arc | 9.35 years |
| Aphelion | 20.8 AU |
| Perihelion | 11.77 AU (outside Saturn's orbit) |
| Semi-major axis | 16.28 AU |
| Eccentricity | 0.27705 |
| Orbital period | 65.67 yr |
| Max. orbital speed | 9.8 km/s |
| Min. orbital speed | 5.6 km/s (2033-Nov-30) |
| Inclination | 19.0529° |
| Last perihelion | April 24, 2001 |
| Next perihelion |
|
| TJupiter | 3.52 |
| Physical characteristics | |
| Dimensions | 66.17±22.9 km |
| 0.053±0.019 | |
| sdfg | |
The comet nucleus (~66 km) is roughly half the size of C/2014 UN271 (Bernardinelli–Bernstein) and it has a similar perihelion point just outside the orbit of Saturn.
| Comet | Nucleus diameter |
Perihelion (Sun approach) |
Perihelion velocity |
|---|---|---|---|
| 95P/Chiron | 215 km | 8.5 AU | 12.0 km/s |
| C/2014 UN271 (Bernardinelli–Bernstein) | 120 km | 10.95 AU | 12.7 km/s |
| 167P/CINEOS | 66 km | 11.77 AU | 9.8 km/s |
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