(614689) 2020 XL5: Difference between revisions

{{DISPLAYTITLE:{{mp|(614689) 2020 XL|5}}}}

| name = {{mp|(614689) 2020 XL|5}}

| discovery_ref = &thinsp;<ref name="MPEC-2020-X171"/><ref name="MPC-object"/>

| mpc_name = {{mp|(614689) 2020 XL|5}}

| alt_names = {{mp|2020 XL|5}}{{·}}P11aRcq&thinsp;<ref name="NEO-Exchange"/><ref name="PseudoMPEC"/>

| mp_category = {{nowrap|[[Earth trojan]]<ref name="Hecht2021"/>{{·}}[[Near-Earth object|NEO]]<br/>[[Apollo asteroid|Apollo]]&thinsp;<ref name="jpldata"/>}}

| orbit_ref = &thinsp;<ref name="jpldata"/>

'''{{mp|(614689) 2020 XL|5}}''' is a [[near-Earth asteroid]] and [[Earth trojan]] discovered by the [[Pan-STARRS 1]] survey at [[Haleakala Observatory]], [[Hawaii]] on 12 December 2020. It [[Tadpole orbit|oscillates]] around the [[Sun]]–[[Earth]] {{L4}} [[Lagrangian point]] (leading 60°), one of the dynamically stable locations where the combined gravitational force acts through the Sun's and Earth's [[barycenter]]. Analysis of {{mp|2020 XL|5}}'s [[Trojan (astronomy)|trojan]] orbit stability suggests it will remain around Earth's {{L4|nolink=yes}} point for at least four thousand years until gravitational [[perturbation (astronomy)|perturbations]] from repeated close encounters with [[Venus]] destabilize its trojan configuration. With a diameter about {{cvt|1.2|km|mi}}, {{mp|2020 XL|5}} is the second Earth trojan discovered and is the largest of its kind known, after {{mpl|2010 TK|7}}.,<ref name="Santana-Ros2022"/><ref name="NYT-20220202">{{cite news |last=Chang |first=Kenneth |title=Astronomers Find a New Asteroid Sharing Earth’sEarth's Orbit - The Trojan asteroid 2020 XL5, which follows the same path around the sun as our planet, was revealed only after a decade of searching. |url=https://www.nytimes.com/2022/02/02/science/astronomy-asteroid-trojan.html |date=2 February 2022 |work=[[The New York Times]] |accessdate=2 February 2022 }}</ref> and is the largest of its kind known.

The asteroid was subsequently listed on the [[Minor Planet Center]]'s [[Near-Earth Object Confirmation Page]] (NEOCP) as P11aRcq.<ref name="PseudoMPEC"/> Over two days, follow-up observations were carried out by the [[Višnjan Observatory]] {{small|([[List of observatory codes#L01|L01]])}}, [[ESA Optical Ground Station]] {{small|([[List of observatory codes#J04|J04]])}}, and [[Cerro Tololo Observatory]] {{small|([[List of observatory codes#807|807]])}}. The asteroid was identified in earlier [[Mount Lemmon Survey]] {{small|([[List of observatory codes#G96|G96]])}} observations from 26 November 2020. The listing was confirmed and publicly announced as {{mp|2020 XL|5}} on 14 December 2020.<ref name="MPEC-2020-X171"/>

The orbit of {{mp|2020 XL|5}} is well- known with an [[uncertainty parameter]] of 0 and a long [[observation arc]] over 8 years. The asteroid has been identified in several [[precovery]] observations by various sky surveys, including Pan-STARRS, from dates as far back as December 2012.<ref name="jpldata"/><ref name="Santana-Ros2022"/>

[[Photometry (astronomy)|Photometric]] measurements of optical observations from 2020–20212020 to 2021 show that {{mp|2020 XL|5}} exhibits a [[Asteroid color indices|color]] resembling that of carbonaceous [[C-type asteroid]]s. Assuming that {{mp|2020 XL|5}}'s [[Phase curve (astronomy)|phase curve]] behaves similarly to those of C-type asteroids, the [[absolute magnitude]] (H) of the asteroid is 18.6, which corresponds to a mean diameter about {{cvt|1.18|km|mi}} for a typical C-type asteroid's [[geometric albedo]] of 0.06.<ref name="Santana-Ros2022"/> This makes {{mp|2020 XL|5}} the largest Earth trojan asteroid known to date, being up to three times as large as the {{cvt|0.3|km|mi}}-sized {{mp|2010 TK|7}}.<ref name="Santana-Ros2022"/>

Due to {{mp|2020 XL|5}}'s high orbital inclination, a [[Space rendezvous|rendezvous]] mission to the asteroid from [[low Earth orbit]] (LEO) would require a minimum total [[delta-v]] betweenof {{cvt|7.9–1010.3|km/s|mphmi/s}}—too high to be considered an ideal target for a low-energy trajectory. On the other hand, a [[Flyby (spaceflight)|flyby]] trajectory to {{mp|2020 XL|5}} from LEO could be more feasible with a lower minimum total delta-v betweenof {{cvt|0.9–33.3|km/s|mphmi/s}}.<ref name="Santana-Ros2022"/>

|url = https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=2020%20XL52614689

|title = (614689) = 2020 XL5

|url = http://www.minorplanetcenter.net/db_search/show_object?object_id=2020+XL5614689

|title = "Pseudo-MPEC" for P11aRcq

|url = https://projectpluto.com/neocp2/mpecs/P11aRcq.htm

|first = Bill
|last = Gray

|publisher = Project Pluto

|date = 14 December 2020

|access-date = 6 February 2021}}</ref>

|s2cid = 243860678}}</ref>

|pmid = 35105878 |pmc = 8807697 |arxiv =

|bibcode = 2022NatCo..13..447S

* {{JPL small body|id=541001992614689}}

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[[Category:Apollo asteroids|#614689]]

[[Category:Discoveries by Pan-STARRS|#614689]]

[[Category:MinorEarth planetco-orbital object articles (unnumbered)asteroids|614689]]

[[Category:Earth co-orbital asteroidstrojans|614689]]

[[Category:EarthC-type trojansasteroids (SMASS)|614689]]