70 Panopaea

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70 Panopaea
Orbita asteroida 70.png
Orbital diagram
Discovery [1]
Discovered by Hermann Mayer Salomon Goldschmidt
Discovery site Paris Observatory
Discovery date5 May 1861
Designations
(70) Panopaea
Pronunciation /pænəˈpə/ [2]
Named after
Panopea
main belt [3]
Adjectives Panopaean
Orbital characteristics [4]
Epoch 30 November 2008
Aphelion 3.0903 AU
Perihelion 2.1402 AU
2.61526 AU
Eccentricity 0.181641
1544.79 days (4.23 years)
264.193°
Inclination 11.584°
47.783°
256.016°
Physical characteristics
Dimensions122.17±2.3 km (mean) [5]
Mass (4.33 ± 1.09) × 1018 kg [6]
Mean density
3.48 ± 1.05 [6] g/cm3
15.87 ± 0.04 hours [7]
0.0675 ± 0.003 [5]
C [8]
8.11 [9]

    70 Panopaea is a large main belt asteroid. Its orbit is close to those of the Eunomia asteroid family; however, Panopaea is a dark, primitive carbonaceous C-type asteroid in contrast to the S-type asteroids of the Eunomian asteroids. The spectra of the asteroid displays evidence of aqueous alteration. [10] Photometric studies give a rotation period of 15.797 hours and an amplitude of 0.11±0.01 in magnitude. Previous studies that suggested the rotation period may be twice this amount were rejected based upon further observation. [11]

    Panopaea was discovered by Hermann Goldschmidt on 5 May 1861. [1] It was his fourteenth and last asteroid discovery. It is named after Panopea, a nymph in Greek mythology; the name was chosen by Robert Main, President of the Royal Astronomical Society. [12] In 1862, Swedish astronomer Nils Christoffer Dunér gave a doctoral thesis on the orbital elements of this asteroid. [13]

    The orbit of 70 Panopaea places it in a mean motion resonance with the planets Jupiter and Saturn. The computed Lyapunov time for this asteroid is 24,000 years, indicating that it occupies a chaotic orbit that will change randomly over time because of gravitational perturbations of the planets. [14]

    The asteroid frequently makes close approaches with 16 Psyche, such as on 12 June 2040 when it will make a close approach of 0.00602 AU (2.34 Lunar distances, or approx. 770,000 km, 478,455 mi) to the asteroid, and on 2 June 2095 when it will come only 0.003372 AU (1.31 LD) to the asteroid. [3]

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    References

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    14. Šidlichovský, M. (1999), Svoren, J.; Pittich, E. M.; Rickman, H. (eds.), "Resonances and chaos in the asteroid belt", Evolution and source regions of asteroids and comets : proceedings of the 173rd colloquium of the International Astronomical Union, held in Tatranska Lomnica, Slovak Republic, August 24–28, 1998, pp. 297–308, Bibcode:1999esra.conf..297S.