Keid
Double/Multiple Star in Eridanus
| Common Names: | Omicron2 Eridani |
| Position (J2000): | 04h15m18s -07°38'42" |
| Finder Charts: | 30° | 15° | 5° |
| Other Identifiers: | V* DY Eri, STF 518, Σ 518, HD 26965, 40 Eri, Omi2 Eri, ο2 Eri, ADS 3093, BD-07 780, CCDM J04153-0739A, HIP 19849, HR 1325, SAO 131063, AAVSO 0410-07, WDS 04153-0739 |
This triple star system is located less than 16.5 light-years away in the northernmost part of Constellation Eridanus. Omicron2 (40) Eridani A has become one of the top 100 target stars for NASA's planned Terrestrial Planet Finder (TPF)
Sir William Friedrich Wilhelm Herschel discovered that Omicron2 Eridani A was not simply a single star in 1783. Omicron2 Eridani A's companion itself was discovered to be the binary pair BC in 1851 by Otto Wilhelm von Struve. Finally, the companion B became the first "white dwarf" to be discovered in 1910 when astronomers Henry Norris Russell, Edward Charles Pickering, and Williamina Paton Stevens Fleming realized that this dim star was of spectral type A rather than M.
Double/Multiple Star Components
| Discoverer | Comp | Mag 1 | Mag 2 | Sep | PA | Year |
|---|---|---|---|---|---|---|
| STF 518 | A-BC | 4.43 | 9.7 | 83 | 104 | 2002 |
| STF 518 | Aa | 4.43 | 12.2 | 77.9 | 97 | 1992 |
| STF 518 | Ab | 4.43 | 12.5 | 211 | 8 | 1907 |
| STF 518 | Ba | 9.7 | 12.2 | 147 | 196 | 1922 |
| STF 518 | Bb | 9.7 | 12.5 | 279.5 | 356 | 1922 |
| STF 518 | BC | 9.52 | 11.17 | 8.8 | 337 | 1998 |
Learn more about Keid on the web, browse the observing lists containing Keid, or review the references used to gather information regarding Keid.
