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Encyclopedia > 21 Lutetia


21 Lutetia
Discovery
Discoverer Hermann M. S. Goldschmidt
Discovery Date November 15, 1852
Alternate Designations  
Category Main belt
Orbital Elements
Epoch January 30, 2005 (JD 2453400.5)
Eccentricity (e) 0.164
Semi-Major Axis (a) 364.277 Gm (2.435 AU)
Perihelion (q) 304.600 Gm (2.036 AU)
Aphelion (Q) 423.955 Gm (2.834 AU)
Orbital Period (P) 1387.902 d (3.80 a)
Mean Orbital Speed 18.96 km/s
Inclination (i) 3.064°
Longitude of the
Ascending Node
(Ω)
80.917°
Argument of Perihelion (ω) 250.227°
Mean Anomaly (M) 75.393°
Physical Characteristics
Dimensions 95.8 km
Mass 9.2×1017 kg
Density 2.0 g/cm³
Surface Gravity 0.0268 m/s²
Escape Velocity 0.0506 km/s
Rotation Period 0.3405 d (8.172 h) 3 (http://www.psi.edu/pds/archive/lc.html)
Spectral Class M
Absolute Magnitude 7.35
Albedo 0.221 4 (http://dorothy.as.arizona.edu/DSN/IRAS/index_iras.html)
Mean Surface Temperature ~237 K

21 Lutetia ("loo TET ee a") is a large Main belt asteroid, about 100 kilometers in diameter.


It was discovered on November 15, 1852 by Hermann Mayer Salomon Goldschmidt at the observatory of Paris. The name Lutetia derives from the Latin name of Paris.


On July 10, 2010 the European Rosetta comet probe will pass the asteroid with a minimum distance of 3000 km on its way to 67P/Churyumov-Gerasimenko.


It will be a rather important flyby, since Lutetia is not only large but also the first metallic M-type asteroid to be visited by a spacecraft. There are serious questions about the metallicity of the M-type asteroids and the probe is expected to settle the issue.


There are two reported stellar Malta (Australia (2003).



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The Minor Planets
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Centaurs | Trans-Neptunians | Damocloids | Comets | Kuiper Belt | Oort Cloud
(For other objects and regions, see: Binary asteroids, Asteroid moons and the Solar system)
(For a complete listing, see: List of asteroids)





  Results from FactBites:
 
Lutetia - Encyclopedia, History, Geography and Biography (563 words)
Lutetia (sometimes Lutetia Parisiorum or Lucotecia, in French Lutèce) was a town in pre-Roman and Roman Gaul.
Lutetia was founded at the point where the Bièvre stream reaches the river Seine, both on the left bank of the Seine and on an island across from the confluence (modern-day Quartier Latin and Île de la Cité, respectively), in the centre of modern Paris.
There is also an asteroid named 21 Lutetia; and the element lutetium was named after the city, in honour of its discovery in a Paris laboratory.
21 Lutetia - definition of 21 Lutetia in Encyclopedia (166 words)
21 Lutetia ("loo TET ee a") is a large Main belt asteroid, about 100 kilometers in diameter.
It will be a rather important flyby, since Lutetia is not only large but also the first metallic M-type asteroid to be visited by a spacecraft.
There are two reported stellar occultations by Lutetia: from Malta (1997) and Australia (2003).
  More results at FactBites »


 
 

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