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}}; color:inherit; | 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:21 Nov 2025 (JD 2461000.5) |Epoch 21 Nov 2025 (JD 2461000.5)}} | data23 = {{#if:0 | Uncertainty parameter 0}} | label24 = Observation arc | data24 = 25.93 yr (9472 days) | label25 = Earliest precovery date | data25 = | label26 = {{#switch:{{{apsis}}} |apsis|gee|barion|center|centre|(apsis)=Apo{{{apsis}}} |Ap{{#if:|{{{apsis}}}|helion}}}} | data26 = 1.4748 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 = 1.2289 AU | label33 = Template:Longitem | data33 = | label34 = Eccentricity | data34 = 0.20011 | label35 = Template:Longitem | data35 = 1.3622 yr (497.57 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 = 1.4912° | label41 = Template:Longitem | data41 = | label42 = Template:Longitem | data42 = 84.182° | label43 = Template:Longitem | data43 = | label44 = Template:Longitem | data44 = | label45 = Template:Longitem | data45 = 210.004° | 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 <ref name="Santana-Ros-2025">Template:Cite journal</ref> | 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 (Template:Val) <ref name="Santana-Ros-2025" /> | 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="Santana-Ros-2025" /> | label94 = Temperature | data94 =

| data100 = {{#if:|

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

}}

| header110 = Atmosphere

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

}}{{#invoke:Check for unknown parameters|check|unknown=Template:Main other|preview=Page using Template:Infobox planet with unknown parameter "_VALUE_"|ignoreblank=y| abs_magnitude | adjective | adjectives | albedo | allsatellites | alt_names | angular_dist | angular_size | aphelion | apoapsis | apsis | apoastron | arg_peri | asc_node | atmosphere | atmosphere_composition | atmosphere_ref | avg_speed | axial_tilt | background | barycentric | bgcolour | caption | circumference | declination | density | dimensions | discovered | discoverer | discovery_method | discovery_ref | discovery_site | earliest_precovery_date | eccentricity | epoch | equatorial_radius | escape_velocity | exosolar planets | extrasolarplanet | family | flattening | group | image | image_alt | image_scale | inclination | jupiter_moid | label_width | long_periastron | magnitude | mars_moid | mass | max_temp_1 | max_temp_2 | max_temp_3 | max_temp_4 | mean_anomaly | mean_diameter | mean_motion | mean_orbit_radius | mean_radius | mean_temp_1 | mean_temp_2 | mean_temp_3 | mean_temp_4 | mercury_moid | min_temp_1 | min_temp_2 | min_temp_3 | min_temp_4 | minorplanet | moid | moment_of_inertia_factor | mp_category | mp_name | mpc_name | name | named_after | neptune_moid | node_rate | note | observation_arc | orbit_diagram | orbit_ref | p_eccentricity | p_inclination | p_mean_motion | p_orbit_ref | p_semimajor | periapsis | periastron | perihelion | perihelion_rate | period | physical_ref | polar_radius | pole_ecliptic_lat | pole_ecliptic_lon | pronounce | pronounced | right_asc_north_pole | rot_velocity | rotation | satellite_of | satellites | saturn_moid | scale_height | semi-amplitude | semimajor | sidereal_day | single_temperature | spectral_type | star | surface_area | surface_grav | surface_pressure | surface_absorbed_dose_rate | surface_equivalent_dose_rate | symbol | synodic_period | temp_name1 | temp_name2 | temp_name3 | temp_name4 | time_periastron | tisserand | uncertainty | uranus_moid | venus_moid | volume }}

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 5.35 minutes.<ref name="Santana-Ros-2025" /> 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 17 April 2024 through 3 June 2024, by several observatories.<ref name="MPC-1998KY26" />

Orbit and classification

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 properties

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. Observations of the asteroid during a close approach to Earth in 2024 revealed a smaller diameter of 11 meters, a shorter rotation period of 5.35 minutes, and a brighter albedo of 0.52.

Exploration

File:Animation of Hayabusa2 orbit - extended mission.webm

Animation of Hayabusa2 orbit - Extended mission
Template:Legend2 Template:·Template:Legend2 Template:·Template:Legend2 Template:·Template:Legend2 Template:·Template:Legend2 Template:·Template:Legend2

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 Template:Mp the smallest object to ever be studied by a spacecraft.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Observations of the asteroid in 2024 cast doubt on if a landing on the asteroid is even possible.<ref name="jpldata" />

References

Template:Reflist

External links

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.
Template:NeoDys
Template:ESA-SSA
Template:JPL small body

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1998 KY26

Contents

Orbit and classification

Physical properties

Exploration

Further reading

References

External links

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1998 KY26

Orbit and classification

Physical properties

Exploration

Further reading

References

External links

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