Catalogue · 1901 CE
Harvard Spectral Classification
History of Astronomy
About the catalogue
The system that orders stars by the appearance of their spectra into the temperature sequence O B A F G K M, developed at Harvard under Edward Pickering and brought to its final form by Annie Jump Cannon. It remains the basis of stellar classification.
Compiled by
Knowledge connections
- Introduced byAnnie Jump Cannon
- Introduced byEdward Charles Pickering
- Part ofModern Astronomy
- Associated withSpectral Classification
- Associated withVizieR
- Associated withLuminosity Classification
Sources & references
The primary and reference sources this topic draws on.
- NASANational Aeronautics and Space Administration
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.
- BritannicaEncyclopaedia Britannica
General reference for the history of astronomy, biographies, and cultural context.