89P/Russell

{{For|other comets discovered by Kenneth S. Russell|Comet Russell (disambiguation){{!}}Comet Russell}}

{{Infobox comet

| name = 89P/Russell

| image =

| discoverer = Kenneth S. Russell

| discovery_site = Siding Spring Observatory

| discovery_date = 28 September 1980

| mpc_name = P/1980 S1
P/1987 N1

| designations = {{unbulleted|Russell 2|1980 III, 1987 XI|1994 XXIX|1980o, 1987q, 1994e}}

| orbit_ref = {{r|jpldata|MPC}}

| epoch = 5 May 2025 (JD 2460800.5)

| observation_arc = 44.39 years

| earliest_precovery_date = 9 August 1980

| obs = 656

| perihelion = 2.222 AU

| aphelion = 5.279 AU

| semimajor = 3.751 AU

| eccentricity = 0.40751

| period = 7.264 years

| inclination = 12.072°

| asc_node = 41.345°

| arg_peri = 250.42°

| mean = 54.870°

| tjup = 2.903

| Earth_moid = 1.239 AU

| Jupiter_moid = 0.741 AU

| physical_ref = {{r|jpldata}}

| mean_diameter = {{cvt|2.8|km|mi}}

| M1 = 8.2

| M2 = 16.3

| magnitude =

| last_p = 26 March 2024

| next_p =

}}

89P/Russell is a periodic comet in the Solar System with a current orbital period of 7.26 years.{{cite web| url=http://cometography.com/pcomets/089p.html| title= 86P/Russell 2|publisher= Gary Kronk|access-date = 15 April 2015}}

Observational history

It was discovered on a photographic plate by Kenneth Russell of Siding Spring Observatory in New South Wales, Australia on 28 September 1980. Brightness was estimated at a magnitude of 17. The elliptical orbit calculated by Brian G. Marsden gave a perihelion date of 19 May 1980 and an orbital period of 7.12 years.

It has been observed on each subsequent apparition, most recently in 2009. The next perihelion is computed as 14 December 2016.