167P/CINEOS

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167P/CINEOS
Discovery
Discovered by CINEOS
Discovery dateAugust 10, 2004
Designations
P/2004 PY42
Orbital characteristics [1] [2]
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 [3]
Min. orbital speed 5.6 km/s (2033-Nov-30)
Inclination 19.0529°
Last perihelionApril 24, 2001
Next perihelionMarch 22, 2066
TJupiter 3.527
Physical characteristics [1]
Dimensions 66.17±22.9  km [4]
0.053±0.019 [4]
  • (B–V) = 0.80±0.04 [5]
  • (V–R) = 0.57±0.03 [5]
  • (R–I) = 0.45±0.03 [5]
  • (B–R) = 1.29±0.03 [6]
Comet nuclear
magnitude (M2)		9.7

167P/CINEOS, also known as 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.

Contents

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 km8.5 AU12.0 km/s
C/2014 UN271 (Bernardinelli–Bernstein) 120 km10.95 AU12.7 km/s
167P/CINEOS66 km11.77 AU9.8 km/s [3]

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. [1]

167P/CINEOS was first reported as a minor planet, designated 2004 PY42, but was found to have a very faint asymmetric cometary coma. [7] 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. [8] 167P/CINEOS not only has orbital parameters similar to those of Chiron, but also a low B–R magnitude of 1.29±0.03, which places it into the group grey centaurs. [6]

In June 2039, 167P/CINEOS will pass 1.64  AU from Uranus. [1]

References

  1. 1 2 3 4 "167P/CINEOS – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory . Retrieved July 12, 2012.
  2. ↑ "167P/CINEOS Orbit". Minor Planet Center . Retrieved June 18, 2014.
  3. 1 2 "Horizons Batch for 167P/CINEOS on 2066-Mar-18" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Archived from the original on June 24, 2022. Retrieved June 24, 2022. (JPL#22 Soln.date: 2021-Apr-15)
  4. 1 2 J. M. Bauer; T. Grav; E. Blauvelt; et al. (2013). "Centaurs and Scattered Disk Objects in the Thermal Infrared: Analysis of WISE/NEOWISE Observations". The Astrophysical Journal. 773 (1): 22–33. arXiv: 1306.1862 . Bibcode:2013ApJ...773...22B. doi: 10.1088/0004-637X/773/1/22 .
  5. 1 2 3 D. C. Jewitt (2015). "Color Systematics of Comets and Related Bodies". The Astronomical Journal. 150 (6): 201–219. arXiv: 1510.07069 . Bibcode:2015AJ....150..201J. doi: 10.1088/0004-6256/150/6/201 .
  6. 1 2 S. C. Tegler; W. Romanishin; G. J. Consolmagno (2016). "Two Color Populations of Kuiper Belt and Centaur Objects and the Smaller Orbital Inclinations of Red Centaur Objects". The Astronomical Journal. 152 (6): 210–223. Bibcode:2016AJ....152..210T. doi: 10.3847/0004-6256/152/6/210 . ISSN   0004-6256.
  7. ↑ Romanishin, W.; Tegler, S. C.; Boattini, A.; de Luise, F.; di Paola, A. (June 2005). "Comet C/2004 PY_42 (cineos)". International Astronomical Union Circular – Central Bureau for Astronomical Telegrams. 8545: 1. Bibcode:2005IAUC.8545....1R. ISSN   0081-0304.
  8. ↑ Green, D. W. E. (June 2005). "Comets 165P/2000 B4, 166P/2001 T4, and 167P/2004 PY_42". International Astronomical Union Circular – Central Bureau for Astronomical Telegrams. 8552: 2. Bibcode:2005IAUC.8552....2G. ISSN   0081-0304.
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