Editing 211 Isolda (section)

{{Short description|Main-belt asteroid}}
{{Use dmy dates|date=October 2019}}
{{Infobox planet
 | minorplanet=yes
 | background=#D6D6D6
 | name=211 Isolda
 | discoverer=[[Johann Palisa]]
 | discovered=10 December 1879
 | mpc_name=(211) Isolda
 |image= Орбита астероида 211.png
|caption=Orbital diagram
| pronounced={{IPAc-en|ɪ|ˈ|z|oʊ|l|d|ə}}<ref>{{Cite encyclopedia |url=http://www.lexico.com/definition/Isolde |archive-url=https://web.archive.org/web/20200301061602/https://www.lexico.com/definition/isolde |url-status=dead |archive-date=1 March 2020 |title=Isolde |dictionary=[[Lexico]] UK English Dictionary |publisher=[[Oxford University Press]]}}</ref>
 | adjective=Isoldian {{IPAc-en|ɪ|ˈ|z|oʊ|l|d|i|ə|n}}<ref>Irene Masing-Delic (1992) ''Abolishing Death: A Salvation Myth of Russian Twentieth-Century Literature'', p. 163</ref>
 | alt_names=A879 XA, 1912 AB<br/>1912 BA, 1950 FM
 | named_after=[[Iseult]]
 | mp_category=[[Asteroid belt|Main belt]]
 | epoch=31 July 2016 ([[Julian day|JD]] 2457600.5)
 | semimajor={{Convert|3.04205|AU|Gm|abbr=on}}
 | perihelion={{Convert|2.5514|AU|Gm|abbr=on}}
 | aphelion={{Convert|3.53270|AU|Gm|abbr=on|lk=on}}
 | eccentricity=0.16129
 | period=5.31 [[Julian year (astronomy)|yr]] (1938.0 [[Julian year (astronomy)|d]])
 | inclination=3.8856°
 | asc_node=263.644°
 | arg_peri=173.522°
 | mean_anomaly=260.142[[Degree (angle)|°]]
 | avg_speed=17.08 km/s
 | dimensions={{val|143.19|5.1|ul=km}}<ref name="jpldata"/><br />149.81 ± 6.10 km<ref name="Carry2012"/>
 | mass={{nowrap|(4.49 ± 2.43) × 10<sup>18</sup> kg<ref name="Carry2012"/>}}
 | density=2.54 ± 1.41 g/cm<sup>3</sup><ref name="Carry2012"/>
 | rotation={{Convert|18.365|h|d|abbr=on|lk=on}}
 | spectral_type=[[C-type asteroid|C]]<ref name="Pravec2012"/> ([[Tholen classification|Tholen]])
 | abs_magnitude=7.89,<ref name="jpldata"/> 7.90<ref name="Pravec2012"/>
 | albedo={{val|0.0602|0.004}}<ref name="jpldata"/><br />0.0598 ± 0.0218<ref name="Pravec2012"/>
 | single_temperature=
 | mean_motion={{Deg2DMS|0.185761|sup=ms}} / day
 | orbit_ref=<ref name="jpldata">{{Cite web |url=https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=211;cad=1 |title=211 Isolda |work=[[JPL Small-Body Database]] |publisher=[[NASA]]/[[Jet Propulsion Laboratory]] |access-date=12 May 2016}}</ref>
 | observation_arc=136.19 yr (49742 d)
 | uncertainty=0
}}

'''211 Isolda''' is a very large, dark [[Asteroid belt|main-belt]] [[asteroid]]. It is classified as a [[C-type asteroid]] and is probably composed of primitive [[carbon]]aceous material. The spectra of the asteroid displays evidence of aqueous alteration.<ref name=Fornasier1999/>

It was discovered by Austrian astronomer [[Johann Palisa]] on 10 December 1879, in [[Pula|Pola]], and is possibly named after [[Isolde]], heroine of the legend of [[Tristan and Iseult]].<ref>Schmadel, L. (2003:31). ''Dictionary of minor planet names''. Germany: Springer.</ref>

In 2001, the asteroid was detected by radar from the [[Arecibo Observatory]] at a distance of 1.78&nbsp;AU. The resulting data yielded an effective diameter of {{nowrap|143 ± 16 km}}.<ref name="icarus186_1_126"/>

Between 2009 and 2022, 211 Isolda has been observed to [[Occultation|occult]] seven stars.{{citation needed|date=August 2022}}