Barnard-katalogus
Die sterrekundige Edward Emerson Barnard het ’n lys van donker newels saamgestel wat bekend is as die Barnard Catalogue of Dark Markings in the Sky, of Barnard-katalogus. Die newels op die lys het bekend geword as Barnard-voorwerpe.[1]
Op ’n weergawe van die lys uit 1919 is daar 182 newels;[2] teen 1927 was daar 369.[3]
Verwysings wysig
- ↑ Bok, B. J.; McCarthy, C. C. (1974), "Optical data for selected Barnard objects", Astronomical Journal 79: 42, doi:10.1086/111527, Bibcode: 1974AJ.....79...42B.
- ↑ Barnard, E. E. (1919), "On the dark markings of the sky, with a catalogue of 182 such objects", Astrophysical Journal 49: 1–24, doi:10.1086/142439, Bibcode: 1919ApJ....49....1B
- ↑ Lynds, B. T. (1962), "Catalogue of Dark Nebulae", Astrophysical Journal Supplement 7: 1, doi:10.1086/190072, Bibcode: 1962ApJS....7....1L
