209 Dido

209 Dido
Discovery
Discovered by	C. H. F. Peters
Discovery date	22 October 1879
Designations
MPC designation	(209) Dido
Pronunciation	/ˈdaɪdoʊ/[1]
Named after	Dido
Alternative designations	A909 AB, A909 GB,; A912 RB
Minor planet category	Main belt
Adjectives	Didonian /daɪˈdoʊniən/[2][3]
Orbital characteristics[4]
	Epoch 31 July 2016 (JD 2457600.5)
	Uncertainty parameter 0
Observation arc	136.47 yr (49845 d)
Aphelion	3.33106 AU (498.319 Gm)
Perihelion	2.96843 AU (444.071 Gm)
Semi-major axis	3.14974 AU (471.194 Gm)
Eccentricity	0.057565
Orbital period	5.59 yr (2041.8 d)
Average orbital speed	16.79 km/s
Mean anomaly	311.722°
Mean motion	0° 10m 34.738s / day
Inclination	7.17313°
Longitude of ascending node	0.682681°
Argument of perihelion	248.387°
Physical characteristics
Dimensions	159.94±3.1 km[4]; 140.35 ± 10.12 km[5]
Mass	(4.59 ± 7.42) × 1018 kg[5]
Rotation period	5.7366 h (0.23903 d)[4][6]
Geometric albedo	0.0349±0.001
Spectral type	C
Absolute magnitude (H)	8.24

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.

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

Noah Webster (1884) A Practical Dictionary of the English Language
"didonia". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
Richard Shoaf (1983) Dante, Chaucer, and the currency of the word, p. 52 ff.
"209 Dido". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.
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.
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.

External links

Lightcurve plot of 209 Dido, Palmer Divide Observatory, B. D. Warner (2005)
Asteroid Lightcurve Database (LCDB), query form (info)
Dictionary of Minor Planet Names, Google books
Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
209 Dido at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
209 Dido at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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[1] Noah Webster (1884) A Practical Dictionary of the English Language

[2] "didonia". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)

[3] Richard Shoaf (1983) Dante, Chaucer, and the currency of the word, p. 52 ff.

[jpldata-4] "209 Dido". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.

[Carry2012-5] 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.

[mpb37_1_21-6] 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.