2062 Aten

Template:Short description Template:Use dmy dates {{#invoke:infobox|infoboxTemplate | class = vcard | titleclass = fn org | title = 2062 Aten | image = {{#invoke:InfoboxImage|InfoboxImage|image=Aten Sept 11 2013.png|upright={{#if:||1.1}}|alt=}} | caption = Orbit of Aten at epoch September 2013 | 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-Aten" />

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

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

| data21 = | data22 = {{#if:31 December 2011 (JD 2455926.5) |Epoch 31 December 2011 (JD 2455926.5)}} | data23 = {{#if:0 | Uncertainty parameter 0}} | label24 = Observation arc | data24 = 59.14 yr (21,601 days) | label25 = Earliest precovery date | data25 = 17 December 1955 | label26 = {{#switch:{{{apsis}}} |apsis|gee|barion|center|centre|(apsis)=Apo{{{apsis}}} |Ap{{#if:|{{{apsis}}}|helion}}}} | data26 = 1.1434 AU | label27 = Peri{{#if:|{{{apsis}}}|helion}} | data27 = 0.7901 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 = 0.9668 AU | label33 = Template:Longitem | data33 = | label34 = Eccentricity | data34 = 0.1827 | label35 = Template:Longitem | data35 = 0.95 yr (347 days) | label36 = Template:Longitem | data36 = | label37 = Template:Longitem | data37 = | label38 = Template:Longitem | data38 = 172.27° | label39 = Template:Longitem | data39 = Template:Deg2DMS / day | label40 = Inclination | data40 = 18.934° | label41 = Template:Longitem | data41 = | label42 = Template:Longitem | data42 = 108.60° | label43 = Template:Longitem | data43 = | label44 = Template:Longitem | data44 = | label45 = Template:Longitem | data45 = 148.04° | 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 = 0.1131 AUTemplate:·44.1 LD | 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 = Template:Val km<ref name="Nugent-2016" />
Template:Val km<ref name="Nugent-2015" />
Template:Val km<ref name="Harris-1998a" />
1.1 km<ref name="Gehrels-1994" />
Template:Val km<ref name="Harris-2011" /> | label72 = Template:Longitem | data72 = | 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 h<ref name="Mottola-1995a" /> | 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="Harris-2011" />
Template:Val<ref name="Thomas-2011b" />
0.26<ref name="Gehrels-1994" />
Template:Val<ref name="Harris-1998a" />
Template:Val<ref name="Nugent-2016" />
Template:Val<ref name="Nugent-2015" /> | label94 = Temperature | data94 =

| data100 = {{#if:|

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

}}

| label101 = Surface absorbed dose rate | data101 = | label102 = Surface equivalent dose rate | data102 = | label103 = Template:Longitem | data103 = S Template:Small<ref name="jpldata" />Template:·Sr Template:Small<ref name="jpldata" />
B–V = 0.930<ref name="jpldata" />
U–B = 0.460<ref name="jpldata" /> | label104 = Template:Longitem | data104 = | label105 = Template:Longitem | data105 = | label106 = Template:Longitem | data106 = 16.80<ref name="jpldata" /><ref name="Nugent-2015" />Template:·Template:Val<ref name="Veres-2015" />Template:·17.12<ref name="Mottola-1995a" />Template:·17.20<ref name="lcdb" /><ref name="Harris-1998a" />Template:·17.30<ref name="Nugent-2016" /> | label107 = Template:Longitem | data107 =

| header110 = Atmosphere

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

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2062 Aten Template:IPAc-en,Template:Efn provisional designation Template:Mp, is a stony sub-kilometer asteroid and namesake of the Aten asteroids, a subgroup of near-Earth objects. The asteroid was named after Aten from Egyptian mythology.

It was discovered on 7 January 1976, at the Palomar Observatory by American astronomer Eleanor Helin,<ref name="MPC-Aten" /> who was the principal scientist for the NEAT project until her retirement in 2002. The S-type asteroid measures approximately 900 meters in diameter, has a longer-than average rotation period of 44.77 hours, and approaches the orbit Earth to 44.1 lunar distances.

Orbit and classification

Aten orbits the Sun at a distance of 0.8–1.1 AU once every 11 months (347 days). Its orbit has an eccentricity of 0.18 and an inclination of 19° with respect to the ecliptic.<ref name="jpldata" /> A first precovery was taken at the discovering observatory in December 1955, extending the body's observation arc by more than 20 years prior to its official discovery observation.<ref name="MPC-Aten" />

Namesake of the Aten group

Aten was the first asteroid found to have a semi-major orbital axis of less than one astronomical unit and a period of less than one year.<ref name="springer" /> A new category of asteroids was thus created, the Atens. As of 2017, the group consists of more than 1,200 numbered members. Other groups of near-Earth objects (NEOs) are the Apollo and Amor asteroids, which are both significantly larger than the Atens, while the Atira asteroids form the smallest NEO-group by far.<ref name="CNEOS-Discovery-Statistics" />

Close approaches

The asteroid has an Earth minimum orbit intersection distance of Template:Convert which corresponds to 44.1 lunar distances.<ref name="jpldata" />

Physical characteristics

In the Tholen classification, Aten is a common S-type asteroid. In the SMASS taxonomy it is classified as an Sr-type, a subtype which transitions to the R-type asteroids.<ref name="jpldata" />

Lightcurve

In the 1990s, Italian astronomer Stefano Mottola obtained a rotational lightcurve of Aten during the EUNEASO survey at La Silla, which was a European near-Earth object search and follow-up observation program to determine additional physical parameters. Lightcurve analysis gave a longer-than average rotation period of 40.77 hours with a brightness variation of 0.26 magnitude (Template:Small).<ref name="Mottola-1995a" /> No additional lightcurves have been obtained since.<ref name="lcdb" />

Diameter and albedo

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Aten measures between 700 and 830 meters in diameter and its surface has a high albedo between 0.39 and 0.52.<ref name="Nugent-2016" /><ref name="Nugent-2015" />

in 1994, Tom Gehrels published a diameter of 1.1 kilometers and an albedo of 0.26 in his book Hazards Due to Comets and Asteroids.<ref name="jpldata" /><ref name="Gehrels-1994" /> The Warm Spitzer NEO survey ("ExploreNEOs") gives a diameter of 1.3 kilometers with an albedo of 0.20.<ref name="Harris-2011" />

The Collaborative Asteroid Lightcurve Link agrees with a revised thermal model for asteroid diameters and albedos, and adopts an albedo of 0.28 with a diameter of 0.91 kilometers based on an absolute magnitude of 17.2.<ref name="Harris-1998a" /><ref name="lcdb" /> However, the Minor Planet Center (MPC) classifies Aten as a larger (greater than 1 km) object.<ref name="MPC-Aten" />

Naming

This minor planet was named from Egyptian mythology after Aten, the ancient Egyptian god of the solar disk, originally an aspect of the god Ra.<ref name="springer" /> The official Template:MoMP was published by the Minor Planet Center on 1 August 1978 (Template:Small).<ref name="DoMP-Circular-dates" />

Notes

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References

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2062 Aten

Contents

Orbit and classification

Namesake of the Aten group

Close approaches

Physical characteristics

Lightcurve

Diameter and albedo

Naming

Notes

References

Navigation menu

2062 Aten

Orbit and classification

Namesake of the Aten group

Close approaches

Physical characteristics

Lightcurve

Diameter and albedo

Naming

Notes

References

Navigation menu

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