141 Lumen

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141 Lumen
Discovery [1] and designation
Discovered by P. P. Henry
Discovery date January 13, 1875
Minor planet category Main belt
Orbital characteristics [2]
Epoch March 6, 2006 (JD 2453800.5)
Aphelion 484.378 Gm (3.238 AU)
Perihelion 313.194 Gm (2.094 AU)
398.786 Gm (2.666 AU)
Eccentricity 0.215
1589.717 d (4.35 a)
18.03 km/s
Inclination 11.882°
Physical characteristics
Dimensions 130 km[1]
131.35 ± 5.21[2] km
Mass (8.25 ± 5.77) × 1018[2] kg
Mean density
~1.4 g/cm³ (estimate)[3]
6.95 ± 4.93[2] g/cm3
Equatorial surface gravity
~0.025 m/s² (estimate)
Equatorial escape velocity
~0.06 km/s (estimate)
0.820 d (19.67 h) [4]
0.054 [1]
Surface temp. min mean max
Kelvin ~173 275
Celsius +2°

141 Lumen is a dark (C-type), large rocky asteroid 130 km in diameter orbiting in the main belt near the Eunomia family of asteroids. It is not, however, physically related to the group, being of the wrong spectral class.[citation needed] Yet, NASA continues to categorize it as a main-belt asteroid.[5]

It was discovered on January 13, 1875, by the brothers Paul Henry and Prosper Henry, but Paul is the one who was given the credit for this discovery. It is named for Lumen: Récits de l'infini, a book by the astronomer Camille Flammarion.[6]

Richard P. Binzel and Schelte J. Bus further added to the knowledge about this asteroid in a light-curve survey published in 2003. This project was known as Small Main-belt Asteroid Spectroscopic Survey, Phase II or SMASSII, which built on a previous survey of the main-belt asteroids. The visible-wavelength (0.435–0.925 micrometre) spectra data was gathered between August 1993 and March 1999.[7]

Lightcurve data has also been recorded by observers at the Antelope Hill Observatory, which has been designated as an official observatory by the Minor Planet Center.[8]


  1. ^ a b Supplemental IRAS Minor Planet Survey
  2. ^ a b c Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009.  See Table 1.
  3. ^ See Georgij A. Krasinsky et al. Hidden Mass in the Asteroid Belt, Icarus, Vol. 158, p. 98 (2002), for density estimates
  4. ^ PDS lightcurve derivated data
  5. ^ JPL Small-Body Database Browser
  6. ^ Schmadel Lutz D. Dictionary of Minor Planet Names (fifth edition), Springer, 2003. ISBN 3-540-00238-3.
  7. ^ Bus, S., Binzel, R. P. Small Main-belt Asteroid Spectroscopic Survey, Phase II. EAR-A-I0028-4-SBN0001/SMASSII-V1.0. NASA Planetary Data System, 2003.
  8. ^ Lightcurve Results