211 Isolda

Short description: Main-belt asteroid

211 Isolda

Orbital diagram

Discovery
Discovered by| Johann Palisa
Discovery date| 10 December 1879
Designations

MPC designation

| (211) Isolda
Pronunciation| /ɪˈzoʊldə/[1]
Named after| Iseult

Alternative designations

| A879 XA, 1912 AB
1912 BA, 1950 FM
Minor planet category| Main belt
Adjectives| Isoldian /ɪˈzoʊldiən/[2]
Orbital characteristics[3]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc| 136.19 yr (49742 d)
|{{{apsis}}}|helion}}| 3.53270 astronomical unit|AU (528.484 Gm)
|{{{apsis}}}|helion}}| 2.5514 AU (381.68 Gm)

Semi-major axis

| 3.04205 AU (455.084 Gm)
Eccentricity| 0.16129
Orbital period| 5.31 yr (1938.0 d)
Average Orbital speed| 17.08 km/s
Mean anomaly| 260.142°
Mean motion| 0° 11m 8.74s / day
Inclination| 3.8856°
Longitude of ascending node| 263.644°

|{{{apsis}}}|helion}}

| 173.522°
Physical characteristics
Dimensions| 143.19±5.1 km[3]
149.81 ± 6.10 km[4]
Mass| (4.49 ± 2.43) × 1018 kg[4]
Mean density| 2.54 ± 1.41 g/cm3[4]
Rotation period| 18.365 h (0.7652 d)
Geometric albedo| 0.0602±0.004[3]
0.0598 ± 0.0218[5]

Spectral type

| C[5] (Tholen)
Absolute magnitude (H)| 7.89,[3] 7.90[5]

Isolda (minor planet designation: 211 Isolda) is a very large, dark main-belt asteroid. It is classified as a C-type asteroid and is probably composed of primitive carbonaceous material. The spectra of the asteroid displays evidence of aqueous alteration.[6]

It was discovered by Austrian astronomer Johann Palisa on 10 December 1879, in Pola, and is possibly named after Isolde, heroine of the legend of Tristan and Iseult.[7]

In 2001, the asteroid was detected by radar from the Arecibo Observatory at a distance of 1.78 AU. The resulting data yielded an effective diameter of 143 ± 16 km.[8]

Between 2009 and 2022, 211 Isolda has been observed to occult seven stars.[citation needed]

## References

1. ↑ "Isolde". Isolde. Oxford University Press. http://www.lexico.com/definition/Isolde.
2. ↑ Irene Masing-Delic (1992) Abolishing Death: A Salvation Myth of Russian Twentieth-Century Literature, p. 163
3. ↑ 3.0 3.1 3.2 3.3 "211 Isolda". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=211;cad=1.
4. ↑ 4.0 4.1 4.2 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73 (1): 98–118, doi:10.1016/j.pss.2012.03.009, Bibcode: 2012P&SS...73...98C. See Table 1.
5. ↑ 5.0 5.1 5.2 Pravec, P. et al. (May 2012), "Absolute Magnitudes of Asteroids and a Revision of Asteroid Albedo Estimates from WISE Thermal Observations", Asteroids, Comets, Meteors 2012, Proceedings of the conference held May 16–20, 2012 in Niigata, Japan 1667 (1667): pp. 6089, Bibcode: 2012LPICo1667.6089P. See Table 4.
6. ↑ Fornasier, S. et al. (February 1999), "Spectroscopic comparison of aqueous altered asteroids with CM2 carbonaceous chondrite meteorites", Astronomy and Astrophysics Supplement 135: 65−73, doi:10.1051/aas:1999161, Bibcode: 1999A&AS..135...65F.
7. ↑ Schmadel, L. (2003:31). Dictionary of minor planet names. Germany: Springer.
8. ↑ Magri, Christopher et al. (January 2007), "A radar survey of main-belt asteroids: Arecibo observations of 55 objects during 1999 2003", Icarus 186 (1): 126–151, doi:10.1016/j.icarus.2006.08.018, Bibcode: 2007Icar..186..126M, http://echo.jpl.nasa.gov/asteroids/MBAs/magri.etal.2007.mbas.pdf, retrieved 2015-04-14.

## External links

* The Asteroid Orbital Elements Database
* Minor Planet Discovery Circumstances
* Asteroid Lightcurve Data File
* 211 Isolda at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 211 Isolda at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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