153 Hilda

Template:Short description Template:Use dmy dates {{#invoke:infobox|infoboxTemplate | class = vcard | titleclass = fn org | title = 153 Hilda | image = {{#invoke:InfoboxImage|InfoboxImage|image=Hilda-LB1-mag14.jpg|upright={{#if:||1.1}}|alt=}} | caption = Star field showing Hilda (apmag 14.2) | headerstyle = {{#if:#D6D6D6|background-color:#D6D6D6|background-color:#E0CCFF}} | labelstyle = max-width:{{#if:||11em}}; | autoheaders = y

| header1 = Discovery<ref name=jpldata/>

| label2 = Discovered by | data2 = J. Palisa | label3 = Discovery site | data3 = Austrian Naval Obs. | label4 = Discovery date | data4 = 2 November 1875 | label5 = Template:Longitem | data5 =

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

| label11 = Template:Longitem | data11 = (153) Hilda | label12 = Pronunciation | data12 = Template:IPAc-en<ref>Template:Dict.com</ref> | label13 = Template:Longitem | data13 = | label14 = Template:Longitem | data14 = A875 VC; 1935 GD | label15 = Template:Longitem | data15 = Main belt (Hilda) | label16 = Adjectives | data16 = Hildian Template:IPAc-en<ref>Bhattacharya & Lichtman (2016) Solar Planetary Systems, p. 6</ref> | label17 = Symbol | data17 =

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

| data21 = | data22 = {{#if:31 July 2016 (JD 2457600.5) |Epoch 31 July 2016 (JD 2457600.5)}} | data23 = {{#if:0 | Uncertainty parameter 0}} | label24 = Observation arc | data24 = 121.05 yr (44215 d) | label25 = Earliest precovery date | data25 = | label26 = {{#switch:{{{apsis}}} |apsis|gee|barion|center|centre|(apsis)=Apo{{{apsis}}} |Ap{{#if:|{{{apsis}}}|helion}}}} | data26 = Template:Cvt | label27 = Peri{{#if:|{{{apsis}}}|helion}} | data27 = Template:Cvt | 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 = Template:Cvt | label33 = Template:Longitem | data33 = | label34 = Eccentricity | data34 = 0.13971 | label35 = Template:Longitem | data35 = Template:Cvt 7.94 yr (2898.3 d) | label36 = Template:Longitem | data36 = | label37 = Template:Longitem | data37 = | label38 = Template:Longitem | data38 = 51.690° | label39 = Template:Longitem | data39 = Template:Deg2DMS / day | label40 = Inclination | data40 = 7.8249° | label41 = Template:Longitem | data41 = | label42 = Template:Longitem | data42 = 228.16° | label43 = Template:Longitem | data43 = | label44 = Template:Longitem | data44 = | label45 = Template:Longitem | data45 = 38.617° | 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 = | label52 = Mercury MOID | data52 = | label53 = Venus MOID | data53 = | label54 = Mars MOID | data54 = | label55 = Jupiter MOID | data55 = Template:Convert | label56 = Saturn MOID | data56 = | label57 = Uranus MOID | data57 = | label58 = Neptune MOID | data58 = | label59 = T_Jupiter | data59 = 3.023

| 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}}} degTemplate:\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}}} arcsecTemplate:\yr }} | label67 = Template:Longitem | data67 = {{#if:|{{{node_rate}}} arcsecTemplate:\yr}}

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

| label71 = Dimensions | data71 = Template:Val<ref name=jpldata/> | 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 = ~5.2Template:E kg | label81 = Template:Longitem | data81 = | label82 = Template:Longitem | data82 = | label83 = Template:Longitem | data83 = | label84 = Template:Longitem | data84 = ~ 6 m/s | label85 = Template:Longitem | data85 = Template:Convert<ref name=jpldata/> | 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=jpldata/> | label94 = Temperature | data94 =

| data100 = {{#if:|

{{#if:|}}{{#if:|}}{{#if:|}}{{#if:|}}

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

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| label101 = Surface absorbed dose rate | data101 = | label102 = Surface equivalent dose rate | data102 = | label103 = Template:Longitem | data103 = P<ref name=Lagerkvist_et_al_1995/> | label104 = Template:Longitem | data104 = | label105 = Template:Longitem | data105 = | label106 = Template:Longitem | data106 = 7.48<ref name=jpldata/> | label107 = Template:Longitem | data107 =

| header110 = Atmosphere

| label111 = Template:Longitem | data111 = | label112 = Template:Longitem | data112 = | label113 = Composition by volume | data113 =

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

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153 Hilda is a large asteroid in the outer main belt, with a diameter of 170 km.<ref name=jpldata/> The spectrum matches that of a P-type asteroid.<ref name=Lagerkvist_et_al_1995/> It was discovered by Johann Palisa on 2 November 1875, from the Austrian Naval Observatory at Pula, now Croatia.<ref name=jpldata/> The name was chosen by the astronomer Theodor von Oppolzer, who named it after one of his daughters.<ref>Template:Cite book</ref> It is the largest member of the hilda family, a collisional family of asteroids in the Hilda region.

Orbit and family

File:HildasOrbitWithLagrangePointsLousy.ogv

A schematic of the orbit of 153 Hilda (green), with Jupiter (red). The open red circles are the Jovian Lagrange points that Hilda approaches.<ref group=note>Based on orbital data from the year 2000. Hilda seldom approaches the Lagrangians exactly.</ref>

Hilda gives its name to an asteroid group called the Hilda group (or Hildas for short). It is not a true asteroid family, since the members are not physically related, but rather share similar orbital elements. The Hildas are locked in a 2:3 orbital resonance with Jupiter;<ref name=Broz2008>Template:Cite journal</ref> since Jupiter takes 11.9 years to orbit the Sun while Hilda takes 7.9 years,<ref name=jpldata/> Jupiter orbits the Sun twice for every 3 orbits that Hilda completes. There are over 1,100 other objects known to be in a 2:3 resonance with Jupiter.<ref name=Broz2008/> The asteroid is, however, the largest member of the ancient physically related Hilda family within the dynamical group of the same name.

The orbital plane of 153 Hilda is inclined at an angle of 7.82° to the plane of the ecliptic. It has an orbital eccentricity (ovalness) of 0.13971.<ref name=jpldata/> Multiple light curves of the asteroid provide a consistent rotation period of approximately Template:Val<ref name=Pilcher_2020/>

Notes

<references group=note/>

External links

• The triangle formed by the Hilda asteroids EasySky
• Template:AstDys
• Template:JPL small body

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