Encyclopedia > HDE

  Article Content


The Henry Draper catalogue Extension is an extension to the famous Henry Draper Catalogue, a collection of positional and spectroscopic data about hundreds of thousands of stars.

It can be recognized by the prefix HDE, followed by a number indicating the star's position in the catalogue.

All Wikipedia text is available under the terms of the GNU Free Documentation License

  Search Encyclopedia

Search over one million articles, find something about almost anything!
  Featured Article
Timeline of inventions

... developed by Phoenicians 15th century BC: Linear B - mainland[?] Greece or Knossus 10th century BC: Rustproof Iron[?] - India 7th century BC: Coinage, ...