167P/CINEOS

{{Infobox comet

| name=167P/CINEOS

| image=

| discoverer=CINEOS

| discovery_date=August 10, 2004

| designations={{mp|P/2004 PY|42}}

| epoch=2066-03-11

| observation_arc = 9.35 years

| semimajor=16.28 AU

| 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)

| period=65.67 yr

| last_p=April 24, 2001

| next_p= {{plainlist|

March 18, 2066
March 22, 2066
March 23, 2066

}}

| albedo = {{val|0.053|0.019}}

| spectral_type = sdfg

| dimensions = {{val|66.17|22.9|ul=km}}

| tjup = 3.52

}}

167P/CINEOS ({{mp|P/2004 PY|42}}) is a large periodic comet and active, grey centaur, approximately {{convert|66|km|mi|abbr=off|sigfig=2|sp=us}} 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 {{mpl|C/2014 UN|271}} (Bernardinelli–Bernstein) and it has a similar perihelion point just outside the orbit of Saturn.

class="wikitable sortable" style="font-size: 0.9em;" \|+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

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 {{mp|2004 PY|42}}, 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 {{val|1.29|0.03}}, which places it into the group grey centaurs.

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

References

{{reflist|refs=

{{cite web

|type=2011-10-19 last obs (arc=9.35 years)

|title=JPL Small-Body Database Browser: 167P/CINEOS

|url=https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=167P&view=OPC

|access-date=2012-07-12}}

{{cite web

|title=167P/CINEOS Orbit

|url=http://www.minorplanetcenter.net/db_search/show_object?object_id=167P

|publisher=Minor Planet Center

|access-date=2014-06-18}}

{{cite web

|title=Horizons Batch for 167P/CINEOS on 2066-Mar-18

|publisher=JPL Horizons

|type=Perihelion occurs when rdot flips from negative to positive

|url=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

|archive-url=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

|archive-date=2022-06-24

|url-status=live

|accessdate=2022-06-24}} (JPL#22 Soln.date: 2021-Apr-15)

{{cite web

|date=2005-06-18

|title=167P/CINEOS (2004 PY42) (NK 1185)

|publisher=OAA Computing and Minor Planet Sections

|author=Syuichi Nakano

|author-link=Syuichi Nakano

|url=http://www.oaa.gr.jp/~oaacs/nk/nk1185.htm

|access-date=2012-02-20}}

{{cite journal

|last1 = Romanishin |first1 = W.

|last2 = Tegler |first2 = S. C.

|last3 = Boattini |first3 = A.

|last4 = de Luise |first4 = F.

|last5 = di Paola |first5 = A.

|date = June 2005

|title = Comet C/2004 PY_42 (cineos)

|journal = International Astronomical Union Circular – Central Bureau for Astronomical Telegrams

|volume = 8545

|page = 1

|url = http://www.cbat.eps.harvard.edu/iauc/08500/08545.html

|bibcode = 2005IAUC.8545....1R

|issn = 0081-0304}}

{{cite journal

|last1 = Green |first1 = D. W. E.

|date = June 2005

|title = Comets 165P/2000 B4, 166P/2001 T4, and 167P/2004 PY_42

|journal = International Astronomical Union Circular – Central Bureau for Astronomical Telegrams

|volume = 8552

|page = 2

|url = http://www.cbat.eps.harvard.edu/iauc/08500/08552.html

|bibcode = 2005IAUC.8552....2G

|issn = 0081-0304}}

{{cite journal

|last1 = Tegler |first1 = S. C.

|last2 = Romanishin |first2 = W.

|last3 = Consolmagno |first3 = G. J.

|last4 = J. |first4 = S.

|date = December 2016

|title = Two Color Populations of Kuiper Belt and Centaur Objects and the Smaller Orbital Inclinations of Red Centaur Objects

|journal = The Astronomical Journal

|volume = 152

|issue = 6

|page = 210

|bibcode = 2016AJ....152..210T

|issn = 0004-6256

|doi = 10.3847/0004-6256/152/6/210|doi-access= free

}}

External links

[http://www.aerith.net/comet/catalog/0167P/2004PY42.html 167P on Seiichi Yoshida's comet list]
{{JPL small body|title=167P/CINEOS|id=1001647}}

Category:Chiron-type comets

Category:Periodic comets

0167

20040810