A binary star is a stellar system consisting of two stars orbiting around their center of mass. For each star, the other is its companion star. Recent research suggests that a large percentage of stars are part of systems with at least two stars. Binary star systems are very important in astrophysics, because observing their mutual orbits allows their mass to be determined. The masses of many single stars can then be determined by extrapolations made from the observation of binaries.
Thanks - Mcdonalds
История изменений - Объекты
- Algol - 2009-01-16 18:10:29.0 - [Create] - Noise - Approved
- Mira - 2009-01-16 18:06:30.0 - [Create] - Noise - Approved
- JB 668-991 - 2007-06-12 20:02:19.0 - [Create] - Jon - Approved
- ι Aps - 2007-02-05 00:15:01.0 - [Create] - sergei - Approved
- ι Cnc - 2007-02-05 00:15:01.0 - [Create] - sergei - Approved
- HD 92397 - 2007-02-05 00:14:29.0 - [Create] - sergei - Approved
- HD 75289 - 2007-02-05 00:14:29.0 - [Create] - sergei - Approved
- HD 80606 - 2007-02-05 00:14:29.0 - [Create] - sergei - Approved
- HD 80607 - 2007-02-05 00:14:29.0 - [Create] - sergei - Approved
- HD 117440 - 2007-02-05 00:14:28.0 - [Create] - sergei - Approved
- HD 113703 - 2007-02-05 00:14:28.0 - [Create] - sergei - Approved
- HD 73389 - 2007-02-05 00:14:28.0 - [Create] - sergei - Approved
- HD 73390 - 2007-02-05 00:14:28.0 - [Create] - sergei - Approved
- HD 38529 - 2007-02-05 00:14:28.0 - [Create] - sergei - Approved
- Groombridge 1830 - 2007-02-05 00:13:29.0 - [Create] - sergei - Approved
- Gliese 777 - 2007-02-05 00:13:18.0 - [Create] - sergei - Approved
- Gliese 623 - 2007-02-05 00:13:08.0 - [Create] - sergei - Approved
- Gliese 229 - 2007-02-05 00:12:49.0 - [Create] - sergei - Approved
- γ Cae - 2007-02-05 00:12:31.0 - [Create] - sergei - Approved
- γ Vir - 2007-02-05 00:11:59.0 - [Create] - sergei - Approved
- γ Leo - 2007-02-05 00:11:59.0 - [Create] - sergei - Approved
- γ Vol - 2007-02-05 00:11:59.0 - [Create] - sergei - Approved
- γ Cep - 2007-02-05 00:11:58.0 - [Create] - sergei - Approved
- γ Del - 2007-02-05 00:11:58.0 - [Create] - sergei - Approved
- γ Cru - 2007-02-05 00:11:58.0 - [Create] - sergei - Approved
- γ Cen - 2007-02-05 00:11:57.0 - [Create] - sergei - Approved
- γ Ara - 2007-02-05 00:11:57.0 - [Create] - sergei - Approved
- F Cen - 2007-02-05 00:09:56.0 - [Create] - sergei - Approved
- η Ser - 2007-02-05 00:09:48.0 - [Create] - sergei - Approved
- η Ori - 2007-02-05 00:09:48.0 - [Create] - sergei - Approved
- η Oph - 2007-02-05 00:09:47.0 - [Create] - sergei - Approved
- η Cas - 2007-02-05 00:09:47.0 - [Create] - sergei - Approved
- η Cap - 2007-02-05 00:09:47.0 - [Create] - sergei - Approved
- η CMi - 2007-02-05 00:09:47.0 - [Create] - sergei - Approved
- η Car - 2007-02-05 00:09:47.0 - [Create] - sergei - Approved
- η Ara - 2007-02-05 00:09:46.0 - [Create] - sergei - Approved
- η Ant - 2007-02-05 00:09:46.0 - [Create] - sergei - Approved
- ε TrA - 2007-02-05 00:07:53.0 - [Create] - sergei - Approved
- ε CMa - 2007-02-05 00:07:52.0 - [Create] - sergei - Approved
- ε Sgr - 2007-02-05 00:07:52.0 - [Create] - sergei - Approved
- ε Tau - 2007-02-05 00:07:52.0 - [Create] - sergei - Approved
- ε Ret - 2007-02-05 00:07:52.0 - [Create] - sergei - Approved
- ε Tel - 2007-02-05 00:07:52.0 - [Create] - sergei - Approved
- ε Tri - 2007-02-05 00:07:52.0 - [Create] - sergei - Approved
- ε Boo - 2007-02-05 00:07:51.0 - [Create] - sergei - Approved
- δ Vir - 2007-02-04 20:47:15.0 - [Create] - sergei - Approved
- δ TrA - 2007-02-04 20:47:15.0 - [Create] - sergei - Approved
- δ Tuc - 2007-02-04 20:47:15.0 - [Create] - sergei - Approved
- δ Tau - 2007-02-04 20:47:15.0 - [Create] - sergei - Approved
- δ Ori - 2007-02-04 20:47:14.0 - [Create] - sergei - Approved
- δ Boo - 2007-02-04 20:47:14.0 - [Create] - sergei - Approved
- δ Gem - 2007-02-04 20:47:14.0 - [Create] - sergei - Approved
- D Cen - 2007-02-04 20:47:13.0 - [Create] - sergei - Approved
- Cyg X-1 - 2007-02-04 20:44:57.0 - [Create] - sergei - Approved
- χ Tau - 2007-02-04 20:44:55.0 - [Create] - sergei - Approved
- α CVn - 2007-02-04 20:44:55.0 - [Create] - sergei - Approved
- χ Dra - 2007-02-04 20:44:54.0 - [Create] - sergei - Approved
- χ Sgr - 2007-02-04 20:44:54.0 - [Create] - sergei - Approved
- HD 69863 - 2007-02-04 20:42:27.0 - [Create] - sergei - Approved
- χ Aql - 2007-02-04 20:42:03.0 - [Create] - sergei - Approved
- CS Cam - 2007-02-04 20:42:02.0 - [Create] - sergei - Approved
- 55 Cnc - 2007-02-04 20:42:02.0 - [Create] - sergei - Approved
- ο Cap - 2007-02-04 20:42:02.0 - [Create] - sergei - Approved
- β Sgr - 2007-02-04 20:40:21.0 - [Create] - sergei - Approved
- β TrA - 2007-02-04 20:40:04.0 - [Create] - sergei - Approved
- β Sct - 2007-02-04 20:40:04.0 - [Create] - sergei - Approved
- β Tuc - 2007-02-04 20:40:04.0 - [Create] - sergei - Approved
- β Dra - 2007-02-04 20:40:00.0 - [Create] - sergei - Approved
- β Lyr - 2007-02-04 20:40:00.0 - [Create] - sergei - Approved
- β Del - 2007-02-04 20:40:00.0 - [Create] - sergei - Approved
- β Cnc - 2007-02-04 20:39:59.0 - [Create] - sergei - Approved
- β Aql - 2007-02-04 20:38:21.0 - [Create] - sergei - Approved
- B Vel - 2007-02-04 20:37:17.0 - [Create] - sergei - Approved
- Antares - 2007-02-04 20:36:46.0 - [Create] - sergei - Approved
- α Com - 2007-02-04 20:35:11.0 - [Create] - sergei - Approved
- α Cap - 2007-02-04 20:34:44.0 - [Create] - sergei - Approved
- α Cru - 2007-02-04 20:33:25.0 - [Create] - sergei - Approved
- α And - 2007-02-04 20:33:25.0 - [Create] - sergei - Approved
- Albireo - 2007-02-04 20:33:25.0 - [Create] - sergei - Approved
- α Del - 2007-02-04 20:33:25.0 - [Create] - sergei - Approved
- α Cnc - 2007-02-04 20:33:25.0 - [Create] - sergei - Approved
- α Lib - 2007-02-04 20:33:25.0 - [Create] - sergei - Approved
- α Com - 2007-02-04 20:33:25.0 - [Create] - sergei - Approved
- 83 Leo - 2007-02-04 20:33:24.0 - [Create] - sergei - Approved
- 57 Cnc - 2007-02-04 20:30:59.0 - [Create] - sergei - Approved
- 70 Oph - 2007-02-04 20:30:25.0 - [Create] - sergei - Approved
- 61 Cyg - 2007-02-04 20:30:25.0 - [Create] - sergei - Approved
- 41 Cap - 2007-02-04 20:30:24.0 - [Create] - sergei - Approved
- 41 Ara - 2007-02-04 20:30:24.0 - [Create] - sergei - Approved
- 47 Boo - 2007-02-04 20:30:24.0 - [Create] - sergei - Approved
- 23 UMa - 2007-02-04 20:30:22.0 - [Create] - sergei - Approved
- 25 CVn - 2007-02-04 20:30:22.0 - [Create] - sergei - Approved
- 20 LMi - 2007-02-04 20:30:22.0 - [Create] - sergei - Approved
- 3 Cen - 2007-02-04 20:30:22.0 - [Create] - sergei - Approved
- 24 Cnc - 2007-02-04 20:30:22.0 - [Create] - sergei - Approved
- 19 CVn - 2007-02-04 20:27:06.0 - [Create] - sergei - Approved
- 16 Cyg - 2007-02-04 20:26:33.0 - [Create] - sergei - Approved
- 101 Aqr - 2007-02-04 20:25:56.0 - [Create] - sergei - Approved
- 15 Boo - 2007-02-04 20:25:56.0 - [Create] - sergei - Approved
- 107 Aqr - 2007-02-04 20:25:56.0 - [Create] - sergei - Approved
- α Com - 2007-02-04 20:23:44.0 - [Create] - sergei - Approved
INHABITED SKY