# 167P/CINEOS

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'*167P/CINEOS**, also known as '***, is a large [periodic comet](/source/List_of_numbered_comets) and active, grey [centaur](/source/Centaur_(small_Solar_System_body)), approximately 66 kilometers (41 miles) in diameter, orbiting the Sun outside the orbit of [Saturn](/source/Saturn). It was discovered on August 10, 2004, by astronomers with the [CINEOS survey](/source/Campo_Imperatore_Near-Earth_Object_Survey) at [Gran Sasso](/source/Gran_Sasso) in Italy. It is one of only a handful known [Chiron-type comets](/source/Chiron-type_comet).

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

## Description

Due to its high [Jupiter tisserand](/source/Tisserand's_parameter) of 3.5, and a [semi-major axis](/source/Semi-major_axis) larger than that of [Jupiter](/source/Jupiter), 167P/CINEOS is classified as a [Chiron-type comet](/source/Chiron-type_comet), named after the groups namesake, [2060 Chiron](/source/2060_Chiron) or 95P/Chiron, designated as both [minor planet](/source/Minor_planet) and comet.[3]

167P/CINEOS was first reported as a minor planet, designated , but was found to have a very faint asymmetric [cometary coma](/source/Coma_(cometary)).[4] 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](/source/Small_Solar_System_bodies).[5] 167P/CINEOS not only has [orbital parameters](/source/Orbital_parameters) similar to those of Chiron, but also a low [B–R magnitude](/source/Distant_object_color_indices) of 1.29 ± 0.03, which places it into the group grey centaurs.[6]

In June 2039, 167P/CINEOS will pass 1.64 [AU](/source/Astronomical_Unit) from [Uranus](/source/Uranus).[3]

## References

1. ["Horizons Batch for 167P/CINEOS on 2066-Mar-18"](https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%27167P%27&START_TIME=%272066-Mar-17%27&STOP_TIME=%272066-Mar-21%27&STEP_SIZE=%271%20hours%27&QUANTITIES=%2719,22%27) (Perihelion occurs when rdot flips from negative to positive). [JPL Horizons](/source/JPL_Horizons_On-Line_Ephemeris_System). [Archived](https://web.archive.org/web/20220624114237/https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%27167P%27&START_TIME=%272066-Mar-17%27&STOP_TIME=%272066-Mar-21%27&STEP_SIZE=%271%20hours%27&QUANTITIES=%2719%27) 2022-06-24 at the Wayback Machine. Retrieved 2022-06-24. (JPL#22 Soln.date: 2021-Apr-15)

1. 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](https://arxiv.org/abs/1306.1862). [Bibcode:2013ApJ...773...22B](https://ui.adsabs.harvard.edu/abs/2013ApJ...773...22B). [doi:10.1088/0004-637X/773/1/22](https://doi.org/10.1088/0004-637X/773/1/22)

1. ["167P/CINEOS – JPL Small-Body Database Lookup"](https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=167P). *ssd.jpl.nasa.gov*. [Jet Propulsion Laboratory](/source/Jet_Propulsion_Laboratory). Retrieved 2012-07-12.

1. Romanishin, W.; Tegler, S. C.; Boattini, A.; de Luise, F.; di Paola, A. (June 2005). ["Comet C/2004 PY_42 (cineos)"](http://www.cbat.eps.harvard.edu/iauc/08500/08545.html). *International Astronomical Union Circular – Central Bureau for Astronomical Telegrams*. **8545**: 1. [Bibcode:2005IAUC.8545....1R](https://ui.adsabs.harvard.edu/abs/2005IAUC.8545....1R). [ISSN 0081-0304](https://www.worldcat.org/issn/0081-0304)

1. Green, D. W. E. (June 2005). ["Comets 165P/2000 B4, 166P/2001 T4, and 167P/2004 PY_42"](http://www.cbat.eps.harvard.edu/iauc/08500/08552.html). *International Astronomical Union Circular – Central Bureau for Astronomical Telegrams*. **8552**: 2. [Bibcode:2005IAUC.8552....2G](https://ui.adsabs.harvard.edu/abs/2005IAUC.8552....2G). [ISSN 0081-0304](https://www.worldcat.org/issn/0081-0304)

1. 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](https://ui.adsabs.harvard.edu/abs/2016AJ....152..210T). [doi:10.3847/0004-6256/152/6/210](https://doi.org/10.3847/0004-6256/152/6/210). [ISSN 0004-6256](https://www.worldcat.org/issn/0004-6256)

## External links

- [167P on Seiichi Yoshida's comet list](http://www.aerith.net/comet/catalog/0167P/2004PY42.html)

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Adapted from the Wikipedia article [167P/CINEOS](https://en.wikipedia.org/wiki/167P%2FCINEOS) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/167P%2FCINEOS?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.