1221 Amor

Template:Short description Template:Use dmy dates {{#invoke:infobox|infoboxTemplate | class = vcard | titleclass = fn org | title = 1221 Amor | image = {{#invoke:InfoboxImage|InfoboxImage|image=1221 Amor orbit.png|upright={{#if:||1.1}}|alt=}} | caption = Orbital diagram of Amor (cyan) with Earth, Mars and Jupiter (outermost) on 12 March 1932 | headerstyle = {{#if:#FFC2E0|background-color:#FFC2E0|background-color:#E0CCFF}} | labelstyle = max-width:{{#if:||11em}}; | autoheaders = y

| header1 = Discovery<ref name="MPC-object" /><ref name="Ferret" />

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

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

| data21 = | data22 = {{#if:23 March 2018 (JD 2458200.5) |Epoch 23 March 2018 (JD 2458200.5)}} | data23 = {{#if:0 | Uncertainty parameter 0}} | label24 = Observation arc | data24 = 86.50 yr (31,595 d) | label25 = Earliest precovery date | data25 = | label26 = {{#switch:{{{apsis}}} |apsis|gee|barion|center|centre|(apsis)=Apo{{{apsis}}} |Ap{{#if:|{{{apsis}}}|helion}}}} | data26 = 2.7550 AU | label27 = Peri{{#if:|{{{apsis}}}|helion}} | data27 = 1.0832 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 = 1.9191 AU | label33 = Template:Longitem | data33 = | label34 = Eccentricity | data34 = 0.4355 | label35 = Template:Longitem | data35 = 2.66 yr (971 d) | label36 = Template:Longitem | data36 = | label37 = Template:Longitem | data37 = | label38 = Template:Longitem | data38 = 102.03° | label39 = Template:Longitem | data39 = Template:Deg2DMS / day | label40 = Inclination | data40 = 11.879° | label41 = Template:Longitem | data41 = | label42 = Template:Longitem | data42 = 171.34° | label43 = Template:Longitem | data43 = | label44 = Template:Longitem | data44 = | label45 = Template:Longitem | data45 = 26.656° | 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 = 0.1069 AU (41.6 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 = | label72 = Template:Longitem | data72 = Template:Ubl | 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 = | 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:Ubl | 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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1221 Amor Template:IPAc-en is an asteroid and near-Earth object on an eccentric orbit, approximately Template:Convert in diameter. It is the namesake of the Amor asteroids, the second-largest subgroup of near-Earth objects. It was discovered by Eugène Delporte at the Uccle Observatory in 1932, the first time that an asteroid was seen to approach Earth so closely.<ref name="MPC-object" /> The assumed S-type asteroid is one of few low-numbered asteroids for which no rotation period has been determined.<ref name="lcdb" /> It was assigned the provisional designation Template:Mp and named for Cupid, also known as "Amor" in Latin, the Roman equivalent of the Greek god Eros.<ref name="springer" />

DiscoveryEdit

On 12 March 1932, Belgian astronomer Eugène Delporte photographed Amor at the Royal Observatory of Belgium in Uccle,<ref name="MPC-object" /> as it approached Earth to within 16 million kilometers (about 40 times the distance from Earth to the Moon). This was the first time that an asteroid was seen to approach Earth so closely. The body's observation arc begins with its official discovery observation on 12 March 1932, when it was observed at the Uccle and Heidelberg observatories simultaneously.<ref name="MPC-object" />

Orbit and classificationEdit

Amor is the namesake of the Amor asteroid, a subgroup of near-Earth asteroids that approach the orbit of Earth from beyond, but do not cross it. Next to the Apollo group, the Amors are the second largest group of near-Earth objects with more than 7,000 known members.<ref name="CNEOS" /> As with many members of this group, Amor is also a Mars-crosser, crossing the orbit of the Red Planet at 1.66 AU.<ref name="jpldata" />

It orbits the Sun at a distance of 1.08–2.76 AU once every 2 years and 8 months (971 days; semi-major axis of 1.92 AU). Its orbit has a high eccentricity of 0.44 and an inclination of 12° with respect to the ecliptic.<ref name="jpldata" />

Close encountersEdit

Amor has an Earth minimum orbital intersection distance of Template:Convert which corresponds to 41.6 lunar distances.<ref name="jpldata" /> In March 1940, it approached Earth to Template:Convert, its closest approach of all close encounters since 1900. Only in March 2129, it will approach Earth at a similar distance of Template:Convert.<ref name="jpldata" />

NamingEdit

This minor planet was named after the Roman god of love, Cupid, also known as Amor in Latin, and the Roman equivalent of the Greek god Eros.<ref name="springer" /> The near-Earth asteroids 433 Eros and 763 Cupido are also named after the god of love. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (Template:Small).<ref name="springer" />

Physical characteristicsEdit

Amor is an assumed, stony S-type asteroid.<ref name="lcdb" />

Rotation periodEdit

As of 2018, no rotational lightcurve of Amor has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.<ref name="jpldata" /><ref name="lcdb" />

Diameter and albedoEdit

According to Tom Gehrels Template:'s publication Hazards due to Comets and Asteroids from 1994 (pp. 540–543), Amor measures 1.0 kilometer in diameter and its surface has an albedo of 0.15.<ref name="jpldata" /> The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 0.857 kilometers based on an absolute magnitude of 17.7.<ref name="lcdb" />

ReferencesEdit

Template:Reflist

External linksEdit

Asteroid Lightcurve Database (LCDB), query form (info Template:Webarchive)
Dictionary of Minor Planet Names, Google books
Template:NeoDys
Template:ESA-SSA
Template:JPL small body

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