1998 KY26

Template:Short description

Template:Use dmy dates {{#invoke:infobox|infoboxTemplate | class = vcard | titleclass = fn org | title = Template:Mp | image = {{#invoke:InfoboxImage|InfoboxImage|image=Asteroid 1998 KY26.faces model.jpg|upright={{#if:||1.1}}|alt=}} | caption = Three views of a computer model of Template:Mp, derived from radar observations in 1998 | headerstyle = {{#if:#FFC2E0|background-color:#FFC2E0|background-color:#E0CCFF}} | labelstyle = max-width:{{#if:||11em}}; | autoheaders = y

| header1 = Discovery<ref name="jpldata" /><ref name="MPC-1998KY26" />

| header10 = {{#if:|Designations|Designations}}

| header20 = Orbital characteristics{{#ifeq:|yes| (barycentric)}}<ref name="jpldata" />

| data21 = | data22 = {{#if:31 May 2020 (JD 2459000.5) |Epoch 31 May 2020 (JD 2459000.5)}} | data23 = {{#if:0 | Uncertainty parameter 0}} | label24 = Observation arc | data24 = 22.54 yr (8,231 days) | label25 = Earliest precovery date | data25 = | label26 = {{#switch:{{{apsis}}} |apsis|gee|barion|center|centre|(apsis)=Apo{{{apsis}}} |Ap{{#if:|{{{apsis}}}|helion}}}} | data26 = 1.4819 AU | label27 = Peri{{#if:|{{{apsis}}}|helion}} | data27 = 0.9840 AU | label28 = Peri{{#if:|{{{apsis}}}|apsis}} | data28 = | label29 = {{#switch:{{{apsis}}} |helion|astron=Ap{{{apsis}}} |Apo{{#if:|{{{apsis}}}|apsis}}}} | data29 = | label30 = Periastron | data30 = | label31 = Apoastron | data31 = | label32 = Template:Longitem | data32 = 1.2329 AU | label33 = Template:Longitem | data33 = | label34 = Eccentricity | data34 = 0.20192 | label35 = Template:Longitem | data35 = 1.37 yr (500.04 days) | label36 = Template:Longitem | data36 = | label37 = Template:Longitem | data37 = | label38 = Template:Longitem | data38 = 359.504° | label39 = Template:Longitem | data39 = Template:Deg2DMS / day | label40 = Inclination | data40 = 1.4810° | label41 = Template:Longitem | data41 = | label42 = Template:Longitem | data42 = 84.366° | label43 = Template:Longitem | data43 = | label44 = Template:Longitem | data44 = | label45 = Template:Longitem | data45 = 209.378° | label46 = Template:Nowrap | data46 = | label47 = Satellite of | data47 = | label48 = Group | data48 = | label49 = {{#switch: |yes|true=Satellites |Known satellites}} | data49 = | label50 = Star | data50 = | label51 = Earth MOID | data51 = Template:Cvt | label52 = Mercury MOID | data52 = | label53 = Venus MOID | data53 = | label54 = Mars MOID | data54 = | label55 = Jupiter MOID | data55 = | label56 = Saturn MOID | data56 = | label57 = Uranus MOID | data57 = | label58 = Neptune MOID | data58 = | label59 = T_Jupiter | data59 =

| header60 = Proper orbital elements

| label61 = Template:Longitem | data61 = {{#if: |{{{p_semimajor}}} AU}} | label62 = Template:Longitem | data62 = | label63 = Template:Longitem | data63 = | label64 = Template:Longitem | data64 = {{#if: |{{{p_mean_motion}}} deg Template:\yr}} | label65 = Template:Longitem | data65 = {{#if:|{{#expr:360/1 round 5}} yr
({{#expr:365.25*360/1 round 3}} d) }} | label66 = Template:Longitem | data66 = {{#if:|{{{perihelion_rate}}} arcsec Template:\yr }} | label67 = Template:Longitem | data67 = {{#if:|{{{node_rate}}} arcsec Template:\yr}}

| header70 = Template:Anchor{{#if:yes| Physical characteristics|Physical characteristics}}

| label71 = Dimensions | data71 = | label72 = Template:Longitem | data72 = Template:Val Template:Small<ref name="Ostro-1999" />
Template:Val Template:Small<ref name="jpldata" /> | label73 = Template:Longitem | data73 = | label74 = Template:Longitem | data74 = | label75 = Template:Longitem | data75 = | label76 = Flattening | data76 = | label77 = Circumference | data77 = | label78 = Template:Longitem | data78 = | label79 = Volume | data79 = | label80 = Mass | data80 = | label81 = Template:Longitem | data81 = | label82 = Template:Longitem | data82 = | label83 = Template:Longitem | data83 = | label84 = Template:Longitem | data84 = | label85 = Template:Longitem | data85 = Template:Val<ref name="Hicks-1998" />
0.1784 h<ref name="Ostro-1999" /><ref name="Pravec-1998" /> | label86 = Template:Longitem | data86 = | label87 = Template:Longitem | data87 = | label88 = Template:Longitem | data88 = | label89 = Template:Longitem | data89 = | label90 = Template:Longitem | data90 = | label91 = Template:Longitem | data91 = | label92 = Template:Longitem | data92 = | label93 = {{#if:yes |Template:Longitem |Albedo}} | data93 = Template:Val<ref name="Ostro-1999" />
0.124 Template:Small<ref name="lcdb" /> | label94 = Temperature | data94 =

| data100 = {{#if:|

Surface temp.	min	mean	max
{{{temp_name1}}}
{{{temp_name2}}}
{{{temp_name3}}}
{{{temp_name4}}}

}}

| header110 = Atmosphere

| below = {{#if:||Template:Reflist }}

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Template:Mp is a nearly spherical sub-kilometer asteroid, classified as a near-Earth object of the Apollo group. It measures approximately Template:Convert in diameter and is a fast rotator, having a rotational period of only 10.7 minutes. It was first observed on 2 June 1998, by the Spacewatch survey at Kitt Peak National Observatory during 6 days during which it passed 800,000 kilometers (half a million miles) away from Earth (a little more than twice the Earth–Moon distance).<ref name="MPC-1998KY26" /><ref name=spacewatch />

The object's orbit is well known, since it was recovered in 2002 by the Hawaiian Observatory, and it was most recently observed, from 10 till 15 December 2020, by the Cerro Paranal. La Palma Observatory, and Mauna Kea observatories.<ref name="MPEC-2020-X181"/>

Orbit and classificationEdit

Template:Mp orbits the Sun at a distance of 1.0–1.5 AU once every 16 months (500 days). Its orbit has an eccentricity of 0.20 and an inclination of 1° with respect to the ecliptic. It has an Earth minimum orbital intersection distance of approximately Template:Convert, corresponding to 0.98 lunar distances.<ref name="jpldata" />

As a result, it is one of the most easily accessible objects in the Solar System,<ref name=depaul>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> and its orbit frequently brings it on a path very similar to the optimum Earth–Mars transfer orbit.<ref name="jpldata" /> This, coupled with its high water content, makes it an attractive target for further study and a potential source of water for future missions to Mars.<ref name="APOD" />

Physical propertiesEdit

The physical properties of this object were measured by an international team of astronomers led by Dr. Steven J. Ostro of the Jet Propulsion Laboratory using a radar telescope in California and optical telescopes in the Czech Republic, Hawaii, Arizona and California.

Template:Mp is characterized as a potentially metallic X-type asteroid.<ref name="lcdb" /> Optical and radar observations indicate that it is a water-rich object.<ref name="APOD" />

From light curve photometry in 1998, the object is measured to have a rotation period of only 10.7 minutes, which was considered to be one of the shortest sidereal days of any known Solar System object at the time; most asteroids with established rotational rates have periods measured in hours.<ref name="Ostro-1999" /> As a result, it cannot possibly be a rubble pile, as many asteroids are thought to be, and must instead be a monolithic object.<ref name="Hicks-1998" /><ref name="Ostro-1999" /><ref name="Pravec-1998" /> It was the first such object to be discovered, but since 1998, several other small asteroids have been found to also have short rotation periods, some even faster than Template:Mp. Being a rotating body in space, it is subject to the Yarkovsky effect.

ExplorationEdit

File:Animation of Hayabusa2 orbit - extended mission.webm

Animation of Hayabusa2 orbit - Extended mission
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In September 2020, a mission extension for JAXA's Hayabusa2 asteroid sample return probe was selected to do additional flybys of two near-Earth asteroids: 98943 Torifune in July 2026 and a rendezvous with Template:Mp in July 2031. The rendezvous with Template:Mp will be the first visit of a rapidly rotating micro-asteroid.<ref name="Gough2020"/> This will also make 1998 KY26 the smallest object to ever be studied by a spacecraft.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

ReferencesEdit

Template:Reflist

External linksEdit

MPEC 1998-L02
Scott Hudson's Homepage: The Earth-Crossing Asteroid Template:Mp
Steven Ostro's Homepage: Template:Mp
{{#invoke:citation/CS1|citation

|CitationClass=web }}

Media Relations Office. Sun never sets, for long, on fast-spinning, water-rich asteroid (press release). Pasadena, California: Jet Propulsion Laboratory. 22 July 1999.
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