38 Leda

38 Leda
	A three-dimensional model of 38 Leda based on its light curve
Discovery
Discovered by	J. Chacornac
Discovery date	January 12, 1856
Designations
Designation	(38) Leda
Pronunciation	/ˈliːdə/[1]
Named after	Leda
Alternative names	A904 SF; 1949 QO2
Minor planet category	Main belt
Adjectives	Ledean /lɪˈdiːən/ (Latin Lēdæ-us)
Orbital characteristics
	Epoch December 31, 2006 (JD 2454100.5)
Aphelion	472.587 Gm (3.159 AU)
Perihelion	348.232 Gm (2.328 AU)
Semi-major axis	410.409 Gm (2.743 AU)
Eccentricity	0.152
Orbital period	1659.725 d (4.54 a)
Average orbital speed	17.88 km/s
Mean anomaly	107.567°
Inclination	6.955°
Longitude of ascending node	295.890°
Argument of perihelion	168.804°
Physical characteristics
Dimensions	115.41 ± 1.33 km[2]
Mass	(5.71 ± 5.47) × 1018 kg[2]
Mean density	7.09 ± 6.79 g/cm3[2]
Surface gravity	0.0324 m/s²
Escape velocity	0.0613 km/s
Rotation period	0.5350 d (12.84 h) [3]
Albedo	0.0618 [3]
Temperature	~170 K
Spectral type	C[3]
Absolute magnitude (H)	8.32

Leda (minor planet designation: 38 Leda) is a large, dark main-belt asteroid that was discovered by French astronomer J. Chacornac on January 12, 1856, and named after Leda, the mother of Helen of Troy in Greek mythology. In the Tholen classification system, it is categorized as a carbonaceous C-type asteroid, while the Bus asteroid taxonomy system lists it as a Cgh asteroid.[4] The spectra of the asteroid displays evidence of aqueous alteration.[5]

Leda has been studied by radar.[6] During 2002, 38 Leda was observed by radar from the Arecibo Observatory. The return signal matched an effective diameter of 116 ± 13 km. This is consistent with the asteroid dimensions computed through other means.[7] Based upon a light curve that was generated from photometric observations of this asteroid at Pulkovo Observatory, it has a rotation period of 12.834 ± 0.001 hours and varies in brightness by 0.15 ± 0.01 in magnitude.[8]

References

Noah Webster (1884) A Practical Dictionary of the English Language
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.
"38 Leda". JPL Small-Body Database. Jet Propulsion Laboratory. SPK-ID: 38. Retrieved 15 June 2008.
DeMeo, Francesca E.; et al. (2011), "An extension of the Bus asteroid taxonomy into the near-infrared" (PDF), Icarus, 202 (1): 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, archived from the original (PDF) on 17 March 2014, retrieved 12 April 2013. See appendix A.
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.
"Radar-Detected Asteroids and Comets". NASA/JPL Asteroid Radar Research. Retrieved 30 October 2011.
Magri, Christopher; et al. (January 2007), "A radar survey of main-belt asteroids: Arecibo observations of 55 objects during 1999–2003", Icarus, 186 (1): 126–151, Bibcode:2007Icar..186..126M, doi:10.1016/j.icarus.2006.08.018
Pilcher, Frederick (October 2011), "Rotation Period Determinations for 11 Parthenope, 38 Leda, 111 Ate 194 Prokne, 217 Eudora, and 224 Oceana", The Minor Planet Bulletin, 38 (4): 183–185, Bibcode:2011MPBu...38..183P.

External links

38 Leda at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
38 Leda 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

[Carry2012-2] 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.

[JPL-3] "38 Leda". JPL Small-Body Database. Jet Propulsion Laboratory. SPK-ID: 38. Retrieved 15 June 2008.

[DeMeo2011-4] DeMeo, Francesca E.; et al. (2011), "An extension of the Bus asteroid taxonomy into the near-infrared" (PDF), Icarus, 202 (1): 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, archived from the original (PDF) on 17 March 2014, retrieved 12 April 2013. See appendix A.

[Fornasier1999-5] 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.

[detected-6] "Radar-Detected Asteroids and Comets". NASA/JPL Asteroid Radar Research. Retrieved 30 October 2011.

[icarus186_1_126-7] Magri, Christopher; et al. (January 2007), "A radar survey of main-belt asteroids: Arecibo observations of 55 objects during 1999–2003", Icarus, 186 (1): 126–151, Bibcode:2007Icar..186..126M, doi:10.1016/j.icarus.2006.08.018

[Pilcher2011-8] Pilcher, Frederick (October 2011), "Rotation Period Determinations for 11 Parthenope, 38 Leda, 111 Ate 194 Prokne, 217 Eudora, and 224 Oceana", The Minor Planet Bulletin, 38 (4): 183–185, Bibcode:2011MPBu...38..183P.