167P/CINEOS

167P/CINEOS
Discovery
Discovered byCINEOS
Discovery dateAugust 10, 2004
Designations
P/2004 PY42
Orbital characteristics
Epoch2066-03-11
Observation arc9.35 years
Aphelion20.8 AU
Perihelion11.77 AU
(outside Saturn's orbit)
Semi-major axis16.28 AU
Eccentricity0.27705
Orbital period65.67 yr
Max. orbital speed9.8 km/s[1]
Min. orbital speed5.6 km/s (2033-Nov-30)
Inclination19.0529°
Last perihelionApril 24, 2001[2]
Next perihelion
  • March 18, 2066[1]
  • March 22, 2066[2]
  • March 23, 2066[3]
TJupiter3.52
Physical characteristics
Dimensions66.17±22.9 km[4]
0.053±0.019
sdfg

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.

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.

Large comets with perihelion near Saturn's orbit at 10 AU
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[1]
  1. ^ a b c Cite error: The named reference Horizons2066 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference MPC was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference NK1185 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference jpldata was invoked but never defined (see the help page).