511 Davida
Template:Short description Template:Use mdy dates {{#invoke:infobox|infoboxTemplate | class = vcard | titleclass = fn org | title = 511 Davida | image = {{#invoke:InfoboxImage|InfoboxImage|image=511 Davida VLT (2021), deconvolved.pdf|upright={{#if:||1.1}}|alt=}} | caption = | headerstyle = {{#if:#D6D6D6|background-color:#D6D6D6|background-color:#E0CCFF}}; color:inherit; | labelstyle = max-width:{{#if:||11em}}; | autoheaders = y
| header1 = Discovery
| label2 = Discovered by | data2 = R. S. Dugan | label3 = Discovery site | data3 = | label4 = Discovery date | data4 = May 30, 1903 | label5 = Template:Longitem | data5 =
| header10 = {{#if:|Designations|Designations}}
| label11 = Template:Longitem
| data11 = (511) Davida
| label12 = Pronunciation
| data12 = Template:IPAc-en,<ref>John Daintith & William Gould, eds. (2006) The Facts On File Dictionary of Astronomy. 5th edition. Infobase Publishing.</ref> Latin Dāvīda
| label13 = Template:Longitem
| data13 = David Peck Todd
| label14 = Template:Longitem
| data14 = 1903 LU
| label15 = Template:Longitem
| data15 = main-beltTemplate:·Template:Small
Meliboea<ref name="Ferret" />
| label16 = Adjectives
| data16 = Davidian Template:IPAc-en<ref>Template:MW</ref>
| label17 = Symbol
| data17 =
| header20 = Orbital characteristics{{#ifeq:|yes| (barycentric)}}<ref name=JPL>JPL data Retrieved 2021-09-29</ref>
| data21 =
| data22 = {{#if:July 01, 2021
(JD 2459396.5, heliocentric) |Epoch July 01, 2021
(JD 2459396.5, heliocentric)}}
| data23 = {{#if: | Uncertainty parameter {{{uncertainty}}}}}
| label24 = Observation arc
| data24 =
| label25 = Earliest precovery date
| data25 =
| label26 = {{#switch:{{{apsis}}} |apsis|gee|barion|center|centre|(apsis)=Apo{{{apsis}}} |Ap{{#if:|{{{apsis}}}|helion}}}}
| data26 = 3.759 AU
| label27 = Peri{{#if:|{{{apsis}}}|helion}}
| data27 = 2.569 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 = 3.163 AU
| label33 = Template:Longitem
| data33 =
| label34 = Eccentricity
| data34 = 0.188
| label35 = Template:Longitem
| data35 = 5.626 yr (2055 d)
| label36 = Template:Longitem
| data36 =
| label37 = Template:Longitem
| data37 =
| label38 = Template:Longitem
| data38 = 113°
| label39 = Template:Longitem
| data39 =
| label40 = Inclination
| data40 = 15.94°
| label41 = Template:Longitem
| data41 =
| label42 = Template:Longitem
| data42 = 107.6°
| label43 = Template:Longitem
| data43 =
| label44 = Template:Longitem
| data44 =
| label45 = Template:Longitem
| data45 = 337.2°
| 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 =
| label56 = Saturn MOID
| data56 =
| label57 = Uranus MOID
| data57 =
| label58 = Neptune MOID
| data58 =
| label59 = TJupiter
| 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}}} 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:| Physical characteristics|Physical characteristics}}
| label71 = Dimensions
| data71 = (357 ± 2) × (294 ± 2) × (231 ± 50) kmTemplate:RefnTemplate:Efn
| 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>
| label73 = Template:Longitem
| data73 =
| label74 = Template:Longitem
| data74 =
| label75 = Template:Longitem
| data75 =
| label76 = Flattening
| data76 = 0.30Template: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 =
| label83 = Template:Longitem
| data83 =
| label84 = Template:Longitem
| data84 =
| label85 = Template:Longitem
| data85 = 0.2137 d (5.130 h)
| label86 = Template:Longitem
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| label87 = Template:Longitem
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| label91 = Template:Longitem
| data91 =
| label92 = Template:Longitem
| data92 =
| label93 = {{#if: |Template:Longitem |Albedo}}
| data93 = Template:Val geometric (Template:Val BV, Template:Val)<ref name=JPL/>
| label94 = Temperature
| data94 = ~160 K
| 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 = C | label104 = Template:Longitem | data104 = | label105 = Template:Longitem | data105 = 9.50<ref name=bright2003> {{#invoke:citation/CS1|citation |CitationClass=web }}Template:Dead link </ref> to 12.98 | label106 = Template:Longitem | data106 = 6.43<ref name=JPL/> | label107 = Template:Longitem | data107 =
| header110 = Atmosphere
| label111 = Template:Longitem | data111 = | label112 = Template:Longitem | data112 = | label113 = Composition by volume | data113 =
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511 Davida is a large C-type asteroid in the asteroid belt. It is one of the largest asteroids; approximately tied for 7th place, to within measurement uncertainties, and the 5th or 6th most massive. It was discovered by R. S. Dugan in 1903. Davida is named after David Peck Todd, an astronomy professor at Amherst College.
Physical characteristics
Davida is approximately 270–310 km in diameter and comprises an estimated 1.5% of the total mass of the asteroid belt.<ref name=Baer/><ref name="Pitjeva05">Template:Cite journal</ref>Template:Efn It is a C-type asteroid, which means that it is dark in colouring with a carbonaceous chondrite composition.
From 2002 to 2007, astronomers at the Keck Observatory used the Keck II telescope, which is fitted with adaptive optics, to photograph Davida. The asteroid is not a dwarf planet: there are at least two promontories and at least one flat facet with 15-km deviations from a best-fit ellipsoid. The facet is presumably a 150-km global-scale crater like the ones seen on 253 Mathilde. Conrad et al. (2007) show that craters of this size "can be expected from the impactor size distribution, without likelihood of catastrophic disruption of Davida."
Mass
In 2001, Michalak estimated Davida to have a mass of Template:Val.<ref name=Michalak2001/>Template:Efn In 2007, Baer and Chesley estimated Davida to have a mass of Template:Val.<ref name="Baer2007"/> Template:As of, Baer suggests Davida has a mass of Template:Val.<ref name=Baer/> This most recent estimate by Baer indicates that Davida is approximately tied with 704 Interamnia as the fifth-most-massive asteroid, though the error bars of Interamnia are large.<ref name=Baer/>
Composition
Davida's ore content is calculated to be large, and tops other asteroids in calculated worth, with 16 Psyche coming second with a large difference in hypothetical worth.<ref name="a689">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Occultations
There have been 9 occultation events observed since 1987, many of which produced two or three chords.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Two examples shown here.
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Notes
References
External links
- Asteroid occultations, IOTA – International Occultation Timing Association (2011)
- Time lapse photography of Davida
- Al Conrad's research page at Keck
- Template:AstDys
- Template:JPL small body
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