141 Lumen
141 Lumen is a dark large rocky asteroid
Asteroids are a class of small Solar System bodies in orbit around the Sun. They have also been called planetoids, especially the larger ones...

 130 km in diameter orbiting in the main belt near the Eunomia family
Eunomia family
The Eunomia family of asteroids is a large grouping of S-type asteroids named after the Greek goddess Eunomia. It is the most prominent family in the intermediate main belt...

 of asteroids. It is not, however, physically related to the group, being of the wrong spectral class. Yet, NASA continues to categorize it as a main-belt asteroid.

It was discovered on January 13, 1875, by the brothers Paul Henry and Prosper Henry
Paul Henry and Prosper Henry
Paul-Pierre Henry and his brother Mathieu-Prosper Henry were French opticians and astronomers....

, 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
Camille Flammarion
Nicolas Camille Flammarion was a French astronomer and author. He was a prolific author of more than fifty titles, including popular science works about astronomy, several notable early science fiction novels, and several works about Spiritism and related topics. He also published the magazine...


Richard P. Binzel
Richard P. Binzel
Richard "Rick" P. Binzel is a Professor of Planetary Sciences at the Massachusetts Institute of Technology. He is the inventor of the Torino Scale, a method for categorizing the impact hazard associated with near-Earth objects such as asteroids and comets.Binzel was awarded the H. C. Urey Prize...

 and Schelte J. Bus
Schelte J. Bus
Schelte John "Bobby" Bus is an Associate Astronomer at the University of Hawaii Institute for Astronomy and Support Astronomer at NASA's Infrared Telescope Facility IRTF. He received his B.S. from Caltech in 1979, and was awarded his Ph.D from the Massachusetts Institute of Technology in 1999.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.

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
Minor Planet Center
The Minor Planet Center operates at the Smithsonian Astrophysical Observatory , which is part of the Center for Astrophysics along with the Harvard College Observatory ....

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