Appendix
445
| SeventhFirst Magnitude | 20 | |
| SeventhSecond {{{1}}}„ | 65 | |
| SeventhThird {{{1}}}„ | 200 | |
| SeventhFourth {{{1}}}„ | 500 | |
| SeventhFifth {{{1}}}„ | 1400 | |
| SeventhSixth {{{1}}}„ | 5000 | |
| Seventh {{{1}}}„ | 20000 | |
| SeventhEighth {{{1}}}„ | 68000 | |
| SeventhNinth {{{1}}}„ | 240000 | |
| SeventhTenth {{{1}}}„ | 720000 | 1,055,185 |
The lucid, or naked-eye, stars comprise the first six magnitudes.
A 5″ telescope reveals stars down to the 12th magnitude, and Prof. Ritchey of the Mt. Wilson Observatory using the new 60″ reflector has photographed by four-hour exposures stars probably as faint as the 20th or 21st magnitude. It has been estimated that the total number of stars within our ken photographically speaking is possibly 125 million.
| Oldest Stars (Red) |
Next in Order (Yellow) |
Youngest Stars (White) |
| Antares | Our Sun | Sirius |
| Aldebaran | Capella | Deneb |
| Betelgeuse | Pollux | Procyon |
| Arcturus | Spica | |
| Altair | ||
| Regulus |
| Name | Last Perihelion | Period in Years | Next Return |
| Encke | Sept. 15, 1901 | 03.3 | |
| Brorsen | Feb, 25, 1890 | 05.45 | 1911 |
| Tempel Swift | June 5, 1897 | 05.54 | 1913 |
| De Vico Swift | Apr. 27, 1901 | 06.4 | 1914 |
| Tempel II | Oct. 04, 1898 | 06.5 | 1911 |
| Finlay | Feb. 17, 1900 | 06.5 | 1913 |
| Wolf | July 05, 1898 | 06.8 | 1912 |
- ↑ From Todd's Astronomy.
