13 Egeria
Template:Short description {{#invoke:other uses|otheruses}} Template:Use dmy dates {{#invoke:infobox|infoboxTemplate | class = vcard | titleclass = fn org | title = 13 Egeria | image = {{#invoke:InfoboxImage|InfoboxImage|image=13 Egeria VLT (2021), deconvolved.pdf|upright={{#if:||1.1}}|alt=}} | caption = | headerstyle = {{#if:#D6D6D6|background-color:#D6D6D6|background-color:#E0CCFF}} | labelstyle = max-width:{{#if:||11em}}; | autoheaders = y
| header1 = Discovery
| label2 = Discovered by | data2 = Annibale de Gasparis | label3 = Discovery site | data3 = Naples Obs. | label4 = Discovery date | data4 = 2 November 1850 | label5 = Template:Longitem | data5 =
| header10 = {{#if:|Designations|Designations}}
| label11 = Template:Longitem | data11 = (13) Egeria | label12 = Pronunciation | data12 = Template:IPAc-en<ref>Noah Webster (1884) A Practical Dictionary of the English Language</ref> | label13 = Template:Longitem | data13 = Egeria | label14 = Template:Longitem | data14 = | label15 = Template:Longitem | data15 = Main belt | label16 = Adjectives | data16 = Egerian | label17 = Symbol | data17 = Astronomical symbol of 13 Egeria (historical)
| header20 = Orbital characteristics{{#ifeq:|yes| (barycentric)}}<ref name=jpldata>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
| data21 = | data22 = {{#if:17.0 October 2024 (JD 2460600.5) |Epoch 17.0 October 2024 (JD 2460600.5)}} | data23 = {{#if:0 | Uncertainty parameter 0}} | label24 = Observation arc | data24 = 63566 days (174.03 yr) | label25 = Earliest precovery date | data25 = | label26 = {{#switch:{{{apsis}}} |apsis|gee|barion|center|centre|(apsis)=Apo{{{apsis}}} |Ap{{#if:|{{{apsis}}}|helion}}}} | data26 = Template:Convert | label27 = Peri{{#if:|{{{apsis}}}|helion}} | data27 = Template:Convert | 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:Convert | label33 = Template:Longitem | data33 = | label34 = Eccentricity | data34 = 0.085403 | label35 = Template:Longitem | data35 = 4.14 yr (1511.7 d) | label36 = Template:Longitem | data36 = | label37 = Template:Longitem | data37 = 18.56 km/s | label38 = Template:Longitem | data38 = 305.547° | label39 = Template:Longitem | data39 = Template:Deg2DMS / day | label40 = Inclination | data40 = 16.532° | label41 = Template:Longitem | data41 = | label42 = Template:Longitem | data42 = 43.208° | label43 = Template:Longitem | data43 = | label44 = Template:Longitem | data44 = | label45 = Template:Longitem | data45 = 79.222° | 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:Convert | 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 = TJupiter | data59 = 3.363
| header60 = Proper orbital elements
| label61 = Template:Longitem
| data61 = {{#if: |{{{p_semimajor}}} AU}}
| label62 = Template:Longitem
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| label64 = Template:Longitem
| data64 = {{#if: |{{{p_mean_motion}}} degTemplate:\yr}}
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| 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 = 214.8 km × 192 km<ref name="2008a" />
Template:Val (± Template:Val)<ref name=VLT/>
| label72 = Template:Longitem
| data72 = Template:Val<ref name=VLT>P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. Astronomy & Astrophysics 54, A56</ref>
207.6 ± 8.3 km (IRAS)<ref name=jpldata/>
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| label74 = Template:Longitem
| data74 =
| label75 = Template:Longitem
| data75 =
| label76 = Flattening
| data76 = 0.24Template:Efn
| label77 = Circumference
| data77 =
| label78 = Template:Longitem
| data78 =
| label79 = Volume
| data79 =
| label80 = Mass
| data80 = Template:Val<ref name=VLT/>
Template:ValTemplate:Refn<ref name="Baer2011">James Baer, Steven Chesley & Robert Matson (2011) "Astrometric masses of 26 asteroids and observations on asteroid porosity." The Astronomical Journal, Volume 141, Number 5</ref>
| label81 = Template:Longitem
| data81 = Template:Val<ref name=VLT/>
Template:Val<ref name="Baer2011"/>
| label82 = Template:Longitem
| data82 = ≈0.0580 m/s2
| label83 = Template:Longitem
| data83 =
| label84 = Template:Longitem
| data84 = ≈0.1098 km/s
| label85 = Template:Longitem
| data85 = 0.2935 d<ref>{{#invoke:citation/CS1|citation
|CitationClass=web
}}</ref> (7.044 h)
7.045 h<ref name=jpldata/>
Template:Val<ref name=VLT/>
| label86 = Template:Longitem
| data86 =
| label87 = Template:Longitem
| data87 =
| label88 = Template:Longitem
| data88 = 59°<ref name=VLT/>
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| label91 = Template:Longitem
| data91 = Template:Val<ref name=VLT/>
| label92 = Template:Longitem
| data92 = Template:Val<ref name=VLT/>
| label93 = {{#if:yes |Template:Longitem |Albedo}}
| data93 = 0.087<ref name=VLT/>
0.049 ± 0.028<ref name=jpldata/>
0.085 ± 0.007<ref>{{#invoke:citation/CS1|citation
|CitationClass=web
}}</ref>
| label94 = Temperature
| data94 = ~174 K
| data100 = {{#if:|
{{#if:|}}{{#if:|}}{{#if:|}}{{#if:|}}Surface temp. | min | mean | max |
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{{{temp_name1}}} | |||
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| label101 = Surface absorbed dose rate
| data101 =
| label102 = Surface equivalent dose rate
| data102 =
| label103 = Template:Longitem
| data103 = G-type asteroid<ref name=jpldata/>
| label104 = Template:Longitem
| data104 =
| label105 = Template:Longitem
| data105 = 9.71 to 12.46<ref>apmag 9.71 (2061-Nov-06) to 12.46 (1990-Mar-12) JPL Horizons daily output for 1950 to 2099</ref>
| label106 = Template:Longitem
| data106 = 6.91<ref name=jpldata/>
6.74<ref name=VLT/>
| 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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13 Egeria is a large main-belt G-type asteroid.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> It was discovered by Annibale de Gasparis on November 2, 1850. Egeria was named by Urbain Le Verrier, whose computations led to the discovery of Neptune, after the mythological nymph Egeria of Aricia, Italy, the wife of Numa Pompilius, second king of Rome.<ref>Template:Cite book</ref>
The historical symbol for Egeria was a buckler. It is in the pipeline for Unicode 17.0 as U+1CEC6 (File:Egeria symbol (fixed width).svg).<ref name=astunicode>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name=pipeline>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Egeria occulted a star on January 8, 1992. Its disc was determined to be quite circular (217×196 km). On January 22, 2008, it occulted another star, and this occultation was timed by several observers in New Mexico and Arizona, coordinated by the IOTA Asteroid Occultation Program.<ref name=2008a>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> The result showed that Egeria presented an approximately circular profile to Earth of 214.8×192 km, well in agreement with the 1992 occultation.Template:Citation needed It has also been studied by radar.<ref name="detected">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
In 1988 a search for satellites or dust orbiting this asteroid was performed using the UH88 telescope at the Mauna Kea Observatories, but the effort came up empty.<ref name="Gradie1988"/> Spectral analysis of Egeria shows it to be unusually high in water content, 10.5–11.5% water by mass.<ref>Template:Cite journal</ref> This makes Egeria a prominent candidate for future water-mining ventures.
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- {{#invoke:citation/CS1|citation
|CitationClass=web }} (displays Elong from Sun and V mag for 2011)
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