100P/Hartley

{{Short description|Periodic comet with 6 year orbit}}

{{About|100P/Hartley|other comets|Comet Hartley (disambiguation){{!}}Comet Hartley}}

{{Infobox comet

| name=100P/Hartley

| image=

| discoverer=Malcolm Hartley

| discovery_date=June 13, 1985

| designations=1991 VII; 1985 VII

| epoch=2011-Dec-05
2455900.5

| Earth_moid = {{Convert|1.00|AU|km|abbr=on}}

| semimajor=3.416 AU

| perihelion=1.990 AU

| aphelion=4.841 AU

| eccentricity=0.4172

| period=6.31 a

| inclination=25.661°

| last_p=2022-Aug-10
2016 Apr. 2
2009 Dec. 6

| next_p=2028-Dec-15{{cite web

|title=Horizons Batch for 100P/Hartley 1 on 2028-Dec-15

|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=%27100P%27&START_TIME=%272028-Dec-15%27&STOP_TIME=%272028-Dec-17%27&STEP_SIZE=%273%20hours%27&QUANTITIES=%2719%27

|accessdate=2023-04-29}} (JPL#38/Soln.date: 2022-Aug-20

}}

100P/Hartley, also known as Hartley 1, is a periodic, Jupiter family comet in the Solar System.{{cite web|title=100P/Hartley 1|url=http://ssd.jpl.nasa.gov/sbdb.cgi?ID=c00100_0|publisher=NASA JPL}}

On 29 April 2164 the comet will pass {{convert|0.487|AU|km mi|abbr=on|lk=on}} from Earth.{{cite web

|date=2010-07-12

|title=JPL Close-Approach Data: 100P/Hartley 1

|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=100P;cad=1#cad

|access-date=2012-02-23}}