200 Dynamene

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

Orbital diagram
Discovery
Discovered by	C. H. F. Peters, 1879
Discovery date	27 July 1879
Designations
MPC designation	(200) Dynamene
Pronunciation	/daɪˈnæmɪniː/[1]
Alternative designations	A879 OA; 1904 CA; 1955 HZ; 1961 TO1; 1974 HE1
Minor planet category	Main belt
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	136.47 yr (49845 d)
Aphelion	3.1020 AU (464.05 Gm)
Perihelion	2.3728 AU (354.97 Gm)
Semi-major axis	2.7374 AU (409.51 Gm)
Eccentricity	0.13320
Orbital period (sidereal)	4.53 yr (1654.3 d)
Mean anomaly	10.506°
Mean motion	0° 13m 3.432s / day
Inclination	6.8957°
Longitude of ascending node	324.57°
Argument of perihelion	85.089°
Earth MOID	1.39358 AU (208.477 Gm)
Jupiter MOID	2.2934 AU (343.09 Gm)
TJupiter	3.328
Physical characteristics
Dimensions	128.36±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]
Synodic rotation period	37.394 h (1.5581 d)[2][4]
Geometric albedo	0.0533±0.002
Spectral type	C
Absolute magnitude (H)	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]