200 Dynamene

Dynamene (minor planet designation: 200 Dynamene) is a large dark main-belt asteroid that was discovered by German-American astronomer Christian Heinrich Friedrich Peters on July 27, 1879, in Clinton, New York. The name derives from Dynamene, one of the fifty Nereids in Greek mythology. Based upon its spectrum, 200 Dynamene is classified as a C-type asteroid, indicating that it probably has a primitive composition similar to the carbonaceous chondrite meteorites. The spectra of the asteroid displays evidence of aqueous alteration.[5]

200 Dynamene
Discovery
Discovered byC. H. F. Peters, 1879
Discovery date27 July 1879
Designations
(200) Dynamene
Pronunciation/daɪˈnæmɪniː/[1]
Main belt
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc136.47 yr (49845 d)
Aphelion3.1020 AU (464.05 Gm)
Perihelion2.3728 AU (354.97 Gm)
2.7374 AU (409.51 Gm)
Eccentricity0.13320
4.53 yr (1654.3 d)
10.506°
0° 13m 3.432s / day
Inclination6.8957°
324.57°
85.089°
Earth MOID1.39358 AU (208.477 Gm)
Jupiter MOID2.2934 AU (343.09 Gm)
TJupiter3.328
Physical characteristics
Dimensions128.36±2.1 km[2]
130.71 ± 3.01 km[3]
Mass(1.07 ± 0.16) × 1019 kg[3]
Mean density
9.14 ± 1.51 g/cm3[3]
37.394 h (1.5581 d)[2][4]
0.0533±0.002
C
8.26

    Photometric observations of this asteroid at the Organ Mesa Observatory in Las Cruces, New Mexico in 2011 gave a light curve with a period of 37.394 ± 0.002 hours and a brightness variation of 0.10 ± 0.01 in magnitude. The curve is asymmetrical with four uneven minima and maxima.[4]

    Occultation data from October 9, 2006 using 15 chords shows the asteroid is about 130 km in diameter.[6]

    References
    1. Noah Webster (1884) A Practical Dictionary of the English Language
    2. "200 Dynamene", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
    3. Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73 (1): 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
    4. Pilcher, Frederick (April 2012), "Rotation Period Determinations for 31 Euphrosyne, 65 Cybele, 154 Bertha 177 Irma, 200 Dynamene, 724 Hapag, 880 Herba, and 1470 Carla", The Minor Planet Bulletin, 39 (2): 57–60, Bibcode:2012MPBu...39...57P.
    5. Fornasier, S.; et al. (February 1999), "Spectroscopic comparison of aqueous altered asteroids with CM2 carbonaceous chondrite meteorites", Astronomy and Astrophysics Supplement, 135: 65−73, Bibcode:1999A&AS..135...65F, doi:10.1051/aas:1999161.
    6. "2006 Asteroid Occultation Reports for North America". IOTA (International Occultation Timing Association). Archived from the original on 28 April 2012. Retrieved 8 June 2015. (chords) Archived 10 September 2015 at the Wayback Machine


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