167P/CINEOS explained

167P/CINEOS
Discovery Date:August 10, 2004
Epoch:2066-03-11
Observation Arc:9.35 years
Perihelion:11.77 AU
(outside Saturn's orbit)
Aphelion:20.8 AU
Eccentricity:0.27705
Inclination:19.0529°
Max Speed:9.8 km/s
Min Speed:5.6 km/s (2033-Nov-30)
Last P:April 24, 2001
Next P:
  • March 18, 2066
  • March 22, 2066
  • March 23, 2066
Spectral Type:sdfg
Tjup:3.52

167P/CINEOS is a large periodic comet and active, grey centaur, approximately 66km (41miles) 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.

The comet nucleus (~66 km) is roughly half the size of (Bernardinelli–Bernstein) and it has a similar perihelion point just outside the orbit of Saturn.

Large comets with perihelion near Saturn's orbit at 10 AU! Comet! Nucleus
diameter! Perihelion
(Sun approach)! Perihelion
velocity
215 km 8.5 AU 12.0 km/s
120 km 10.95 AU 12.7 km/s
167P/CINEOS 66 km 11.77 AU 9.8 km/s

Description

Due to its high Jupiter tisserand of 3.5, and a semi-major axis larger than that of Jupiter, 167P/CINEOS is classified as a Chiron-type comet, named after the groups namesake, 2060 Chiron or 95P/Chiron, designated as both minor planet and comet.

167P/CINEOS was first reported as a minor planet, designated, but was found to have a very faint asymmetric cometary coma. Contrary to Chiron, which is the prototype object for the dynamical group of centaurs, 167P/CINEOS has no "dual status" as comet and minor planet, and demonstrates the inconsistencies in applying the current rules for designating small Solar System bodies. 167P/CINEOS not only has orbital parameters similar to those of Chiron, but also a low B–R magnitude of, which places it into the group grey centaurs.

In June 2039, 167P/CINEOS will pass 1.64 AU from Uranus.

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