209 Dido

Dido (minor planet designation: 209 Dido) is a very large main-belt asteroid. It is classified as a C-type asteroid and is probably composed of carbonaceous materials. Like many asteroids of its type, it has an extremely low albedo.

209 Dido
Discovery
Discovered byC. H. F. Peters
Discovery date22 October 1879
Designations
(209) Dido
Pronunciation/ˈdd/[1]
Named after
Dido
A909 AB, A909 GB,
A912 RB
Main belt
AdjectivesDidonian /dˈdniən/[2][3]
Orbital characteristics[4]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc136.47 yr (49845 d)
Aphelion3.33106 AU (498.319 Gm)
Perihelion2.96843 AU (444.071 Gm)
3.14974 AU (471.194 Gm)
Eccentricity0.057565
5.59 yr (2041.8 d)
16.79 km/s
311.722°
 10m 34.738s / day
Inclination7.17313°
0.682681°
248.387°
Physical characteristics
Dimensions159.94±3.1 km[4]
140.35 ± 10.12 km[5]
Mass(4.59 ± 7.42) × 1018 kg[5]
5.7366 h (0.23903 d)[4][6]
0.0349±0.001
C
8.24

    It was discovered by C. H. F. Peters on October 22, 1879, in Clinton, New York and was named after the mythical Carthaginian queen Dido.

    Photometric observations at the Palmer Divide Observatory during 2005 showed a rotation period of 5.7366 ± 0.0005 hours with a brightness variation of 0.17 ± 0.02 in magnitude.[6]

    References

    1. Noah Webster (1884) A Practical Dictionary of the English Language
    2. "didonia". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. (Subscription or UK public library membership required.)
    3. Richard Shoaf (1983) Dante, Chaucer, and the currency of the word, p. 52 ff.
    4. "209 Dido". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.
    5. Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
    6. Warner, Brian D. (December 2005), "Asteroid lightcurve analysis at the Palmer Divide Observatory - spring 2005", The Minor Planet Bulletin, 32 (4): 90–92, Bibcode:2005MPBu...32...90W.


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