38 Leda
{{Short description|Main-belt asteroid}}
{{Other uses of|Leda|Leda (disambiguation){{!}}Leda}}
{{Use dmy dates|date=October 2019}}
{{Infobox planet
| background = #D6D6D6
| name = 38 Leda
| image = 38Leda (Lightcurve Inversion).png
| image_scale =
| caption = A three-dimensional model of 38 Leda based on its light curve
| discoverer = J. Chacornac
| discovered = January 12, 1856
| mpc_name = (38) Leda
| pronounced = {{IPAc-en|ˈ|l|iː|d|ə}}Noah Webster (1884) A Practical Dictionary of the English Language
| adjective = Ledean {{IPAc-en|l|ᵻ|ˈ|d|iː|ə|n}} (Latin Lēdæ-us)
| alt_names = A904 SF; {{mp|1949 QO|2}}
| named_after = Leda
| mp_category = Main belt
| epoch = December 31, 2006 (JD 2454100.5)
| semimajor = 410.409 Gm (2.743 AU)
| perihelion = 348.232 Gm (2.328 AU)
| aphelion = 472.587 Gm (3.159 AU)
| eccentricity = 0.152
| period = 1659.725 d (4.54 a)
| inclination = 6.955°
| asc_node = 295.890°
| arg_peri = 168.804°
| mean_anomaly = 107.567°
| avg_speed = 17.88 km/s
| dimensions = 92.255 ± 0.490 km
| mass = {{nowrap|(7.16 ± 3.38/2.24){{e|17}} kg}}
| density = 1.743 ± 0.822/0.544 g/cm3
| surface_grav = {{Gr|7.16e-4|46.1275|4}} m/s²
| escape_velocity = {{V2|7.16e-4|46.1275|4}} km/s
| rotation = 0.5350 d (12.84 h) {{Cite SBDB|title=38 Leda|id=38|access-date=2008-06-15}}
| spectral_type = C
| abs_magnitude = 8.32
| single_temperature = ~170 K
}}
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. The spectra of the asteroid displays evidence of aqueous alteration.
Leda has been studied by radar. 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 some asteroid dimensions computed through other means. 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.
References
{{Reflist|refs=
| title=Spectroscopic comparison of aqueous altered asteroids with CM2 carbonaceous chondrite meteorites
| display-authors=1 | postscript=.
| last1=Fornasier | first1=S. | last2=Lazzarin | first2=M.
| last3=Barbieri | first3=C. | last4=Barucci | first4=M. A.
| journal=Astronomy and Astrophysics Supplement
| volume=135 | pages=65−73 | date=February 1999
| doi=10.1051/aas:1999161 | bibcode=1999A&AS..135...65F | doi-access=free }}
| first1 = B.
| last1 = Carry
| title = Density of asteroids
| journal = Planetary and Space Science
| volume = 73
| issue = 1
| pages = 98–118
|date=December 2012
| doi = 10.1016/j.pss.2012.03.009
| bibcode = 2012P&SS...73...98C
| postscript= .
|arxiv = 1203.4336 }} See Table 1.
| first1 = Frederick
| last1 = Pilcher
| title = Rotation Period Determinations for 11 Parthenope, 38 Leda, 111 Ate 194 Prokne, 217 Eudora, and 224 Oceana
| journal = The Minor Planet Bulletin
| volume = 38
| issue = 4
| pages = 183–185
|date=October 2011
| bibcode = 2011MPBu...38..183P
| postscript= .}}
| last1=Magri
| first1=Christopher
| last2=Nolan
| first2=Michael C.
| last3=Ostro
| first3=Steven J.
| last4=Giorgini
| first4=Jon D.
| display-authors=1
| title=A radar survey of main-belt asteroids: Arecibo observations of 55 objects during 1999–2003
| journal=Icarus
| volume=186
| issue=1
| pages=126–151
|date=January 2007
| doi=10.1016/j.icarus.2006.08.018
| bibcode=2007Icar..186..126M}}
|first1=Francesca E.
|last1=DeMeo
|first2=Richard P.
|last2=Binzel
|first3=Stephen M.
|last3=Slivan
|first4=Schelte J.
|last4=Bus
|display-authors=1
|title=An extension of the Bus asteroid taxonomy into the near-infrared
|journal=Icarus
|volume=202
|issue=1
|pages=160–180
|year=2011
|doi=10.1016/j.icarus.2009.02.005
|bibcode=2009Icar..202..160D
|url=http://www.tara.tcd.ie/bitstream/2262/43276/1/PEER_stage2_10.1016%252Fj.icarus.2009.02.005.pdf
|access-date=2013-04-12
|postscript=.
|url-status=dead
|archiveurl=https://web.archive.org/web/20140317200310/https://www.tara.tcd.ie/bitstream/2262/43276/1/PEER_stage2_10.1016/j.icarus.2009.02.005.pdf
|archivedate=2014-03-17
}} See appendix A.
| title=Radar-Detected Asteroids and Comets
| publisher=NASA/JPL Asteroid Radar Research
| url=http://echo.jpl.nasa.gov/asteroids/
| access-date=2011-10-30}}
|last1=Fienga |first1=A.
|last2=Avdellidou |first2=C.
|last3=Hanuš |first3=J.
|date=February 2020
|title=Asteroid masses obtained with INPOP planetary ephemerides
|url=https://academic.oup.com/mnras/article/492/1/589/5658701
|journal=Monthly Notices of the Royal Astronomical Society
|volume=492
|issue=1
|pages=589–602
|doi=10.1093/mnras/stz3407
|doi-access=free}}
}}
External links
- {{AstDys|38}}
- {{JPL small body}}
{{Minor planets navigator |37 Fides |number=38 |39 Laetitia}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:000038}}
Category:C-type asteroids (Tholen)