71 Niobe
Template:Short description Template:Use dmy dates {{#invoke:infobox|infoboxTemplate | class = vcard | titleclass = fn org | title = 71 Niobe | image = {{#invoke:InfoboxImage|InfoboxImage|image=71Niobe (Lightcurve Inversion).png|upright={{#if:||1.1}}|alt=}} | caption = Lightcurve-based 3D-model of Niobe | headerstyle = {{#if:#D6D6D6|background-color:#D6D6D6|background-color:#E0CCFF}}; color:inherit; | labelstyle = max-width:{{#if:||11em}}; | autoheaders = y
| header1 = Discovery<ref name="MPC-object" />
| label2 = Discovered by | data2 = R. Luther | label3 = Discovery site | data3 = Düsseldorf Obs. | label4 = Discovery date | data4 = 13 August 1861 | label5 = Template:Longitem | data5 =
| header10 = {{#if:|Designations|Designations}}
| label11 = Template:Longitem
| data11 = (71) Niobe
| label12 = Pronunciation
| data12 = Template:IPAc-en<ref name=OED>Template:OED</ref>
| label13 = Template:Longitem
| data13 = Νιόβη Niobē Template:Small<ref name="springer" />
| label14 = Template:Longitem
| data14 =
| label15 = Template:Longitem
| data15 = main-belt<ref name="MPC-object" /><ref name="jpldata" />Template:·Template:Small
Gallia<ref name="Ferret" />
| label16 = Adjectives
| data16 = Niobean Template:IPAc-en<ref name=OED/>
| label17 = Symbol
| data17 =
| 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 = 154.10 yr (56,286 d) | label25 = Earliest precovery date | data25 = | label26 = {{#switch:{{{apsis}}} |apsis|gee|barion|center|centre|(apsis)=Apo{{{apsis}}} |Ap{{#if:|{{{apsis}}}|helion}}}} | data26 = 3.2348 AU | label27 = Peri{{#if:|{{{apsis}}}|helion}} | data27 = 2.2790 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 = 2.7569 AU | label33 = Template:Longitem | data33 = | label34 = Eccentricity | data34 = 0.1733 | label35 = Template:Longitem | data35 = 4.58 yr (1,672 d) | label36 = Template:Longitem | data36 = | label37 = Template:Longitem | data37 = | label38 = Template:Longitem | data38 = 178.02° | label39 = Template:Longitem | data39 = Template:Deg2DMS / day | label40 = Inclination | data40 = 23.259° | label41 = Template:Longitem | data41 = | label42 = Template:Longitem | data42 = 316.02° | label43 = Template:Longitem | data43 = | label44 = Template:Longitem | data44 = | label45 = Template:Longitem | data45 = 266.88° | 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}}
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| 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 =
| label72 = Template:Longitem
| data72 = Template:Val<ref name="Masiero-2012" />
Template:Val<ref name="AKARI" />
Template:Val<ref name="SIMPS" />
92.75 km Template:Small<ref name="lcdb" />
Template:Val<ref name="Pravec-2012b" />
Template:Val<ref name="WISE" />
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| label75 = Template:Longitem
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| label76 = Flattening
| data76 =
| label77 = Circumference
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| label79 = Volume
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| label80 = Mass
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| data84 =
| label85 = Template:Longitem
| data85 = Template:Val<ref name="Barucci-1985" />
Template:Val<ref name="Lustig-1975" />
Template:Val<ref name="geneva-obs" />
Template:Val<ref name="Piironen-1998" /><ref name="geneva-obs" />
Template:Val<ref name="Harris-1989b" />
Template:Val<ref name="Warner-2006p" />Template:Efn
Template:Val<ref name="lcdb" />
Template:Val<ref name="Sada-2007" />
Template:Val<ref name="Hanus-2016a" />
Template:Val<ref name="Pilcher-2010f" />
| label86 = Template:Longitem
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| data92 =
| label93 = {{#if:yes |Template:Longitem |Albedo}}
| data93 = Template:Val<ref name="Pravec-2012b" />
Template:Val<ref name="WISE" />
Template:Val<ref name="SIMPS" />
Template:Val<ref name="AKARI" />
Template:Val<ref name="Masiero-2012" />
| label94 = Temperature
| data94 =
| data100 = {{#if:|
{{#if:|}}{{#if:|}}{{#if:|}}{{#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 = Tholen = S<ref name="jpldata" />
SMASS = Xe<ref name="jpldata" />Template:·M<ref name="WISE" />Template:·A<ref name="Belskaya-2017" />Template:·X<ref name="lcdb" />
B–V = 0.803<ref name="jpldata" />
U–B = 0.439<ref name="jpldata" />
| label104 = Template:Longitem
| data104 =
| label105 = Template:Longitem
| data105 =
| label106 = Template:Longitem
| data106 = 7.30<ref name="jpldata" /><ref name="Masiero-2012" /><ref name="AKARI" /><ref name="SIMPS" /><ref name="WISE" />
7.31<ref name="lcdb" />
Template:Val<ref name="Pravec-2012b" /><ref name="Harris-1989b" />
| 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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71 NiobeTemplate:Efn is a stony Gallia asteroid and relatively slow rotator from the central regions of the asteroid belt, approximately Template:Convert in diameter. It was discovered by the German astronomer Robert Luther on 13 August 1861, and named after Niobe, a character in Greek mythology. In 1861, the brightness of this asteroid was shown to vary by astronomer Friedrich Tietjen.<ref name="Harwood-1924"/>
Description
Niobe is a member of the Gallia family (Template:Small), a small family of nearly 200 known stony asteroids.<ref name="Nesvorny-2014" />
In 2006, it was examined by radar using the Arecibo Observatory radio telescope in Puerto Rico. This was supplemented by optical observations intended to build a lightcurve. The resulting estimated rotation period of 35.6 hours, or 1.48 Earth days, superseded an earlier estimate of the rotation period as 14.3 hours. The radar data produced an estimate of a maximum equatorial diameter of 94 km, which is consistent with earlier estimates based upon infrared data if the shape is assumed to be slightly elongated.<ref name="Warner-2006p" />Template:Efn
The rotation period was further refined to Template:Nowrap during observations through 2010. Six stellar occultations of this asteroid between 2004 and 2007 produced chords ranging from Template:Convert, which are statistically consistent with the published maximum diameter estimates.<ref name="Pilcher-2010f" />
Notes
References
External links
- Asteroid Lightcurve Database (LCDB), query form (info Template:Webarchive)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- Template:AstDys
- Template:JPL small body
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