55 Cancri A
The yellow dwarf star 55 Cancri A is the brighter of the two [[star[[]]s in a binary star system located 41 lightyears from the Solar system.[1][2] They are found in the constellation Cancer.
55 Cancri A is slightly less massive than Sol, our sun.[2] It is dimmer than Sol. Based on its composition Astronomers believe it to be over 8 billion years old, almost twice Sol's age.
Astronomers have detected five exoplanets orbiting the star, exoplanets with unusual properties.[2] The four inner planets were detected through a detailed analysis of the doppler shift of the star's spectral analysis.[3]
| name | distance | M⊕ | R⊕ | period | notes |
|---|---|---|---|---|---|
| 55 Cancri A e | 0.02 AU | 8.6 | 1.9 | 0.7 days | |
| 55 Cancri A b | 0.11 AU | 262.3 | 14.7 days | ||
| 55 Cancri A c | 0.24 AU | 54.3 | 44.4 days | ||
| 55 Cancri A f | 0.78 AU | 49.3 | 260 days | ||
| 55 Cancri A d | 5.45 AU | 1227.1 | 4867 days |
References
[edit | edit source]- ↑ 1.0 1.1
"★ Star 55 Cancri". Stellar Catalog. Archived from the original on 2025-09-20. Retrieved 2026-07-16.
Binary star 55 Cancri is located 41 light years away from the Sun. It consists of a yellow star and a red dwarf. There are multiple known exoplanets in this system.
- ↑ 2.0 2.1 2.2 C. Moutou; P. Petit; P. Charpentier; P. Cristofari; C. Baruteau; P. Thébault; L. Arnold; E. Artigau; A. Carmona; N.J. Cook; F. Debras; X. Delfosse; J.F. Donati; L. Malo; M. Ould-Elhkim (2026). "Characterising planetary systems with SPIRou: Questions about the magnetic cycle of 55 Cnc A and two new planets around B". Astronomy & Astrophysics. EDP Sciences. 705: A190. doi:10.1051/0004-6361/202556146. ISSN 0004-6361. Archived from the original (PDF) on 2026-01-22. Retrieved 2026-07-16.
- ↑
Debra A. Fischer; Geoffrey W. Marcy; R. Paul Butler; Steven S. Vogt; Greg Laughlin; Gregory W. Henry; David Abouav; Kathryn M. G. Peek; Jason T. Wright; John A. Johnson; Chris McCarthy; Howard Isaacson (2008-03-01). "Five Planets orbiting 55 Cancri". The Astrophysical Journal. The American Astronomical Society. Archived from the original on 2026-07-16. Retrieved 2026-07-16.
We report 18 years of Doppler shift measurements of a nearby star, 55 Cancri, that exhibits strong evidence for five orbiting planets. The four previously reported planets are strongly confirmed here.