143P/Kowal–Mrkos

{{Short description|Periodic comet with 9 year orbit}}

{{Infobox comet

| name=143P/Kowal–Mrkos

| image=

| discoverer=Charles T. Kowal
Antonín Mrkos

| discovery_date=April 23, 1984

| designations=1984 JD; 1984 X; 2000 ET90

| epoch=March 6, 2006

| Jupiter_moid = {{Convert|0.0196|AU|km|abbr=on}}

| semimajor=4.306 AU

| perihelion=2.538 AU

| aphelion=6.074 AU

| eccentricity=0.4106

| period=8.935 a

| inclination= 4.6896°

| last_p=May 7, 2018{{cite web

|title=143P/Kowal-Mrkos Orbit

|url=http://www.minorplanetcenter.net/db_search/show_object?object_id=143P

|publisher=Minor Planet Center

|accessdate=2014-06-18}}
June 12, 2009

| next_p=2026-Dec-28{{cite web

|title=Horizons Batch for 143P/Kowal-Mrkos on 2026-Dec-28

|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=%27143P%27&START_TIME=%272026-Dec-28%27&STOP_TIME=%272026-Dec-29%27&STEP_SIZE=%273%20hours%27&QUANTITIES=%2719%27

|accessdate=2023-04-29}} (JPL#94/Soln.date: 2022-Nov-29)

}}

143P/Kowal–Mrkos is a periodic comet in the Solar System.