55 Cancri A e
The exoplanet 55 Cancri A e is the innermost of five planets orbiting 55 Cancri A, a yellow dwarf star 41 lightyears from the Solar system.[1][2]
The planet is about 8 times the mass of Planet Earth, and its orbital period is less than one day.[1][2] The radius of its orbit is 0.015439 astronomical units.[3]
In 2012 press reports, summarizing recently published papers by Astronomers, characterized it as a "diamond planet".[4][5]
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
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.
- ↑
"⬤ Exoplanet 55 Cancri A e". Stellar Catalog. 2022-11-12. Retrieved 2026-07-21.
Exoplanet 55 Cancri A e orbits star 55 Cancri A that lies 41 light years away from the Sun. It weighs about 8.591 Earth masses and orbits its star much closer than Earth orbits Sun.
- ↑ "Astronomers find planet made of diamond". Australian Broadcasting Corporation News. 2012-10-11. Archived from the original on 2026-06-06. Retrieved 2026-07-16.
- ↑
"Iconic Exoplanets: 55 Cancri e". Kyplanet. 2025-06-25. Archived from the original on 2026-05-27. Retrieved 2026-07-16 – via YouTube.
55 Cancri e, officially named Janssen, is one of the most well-known exoplanets, with some people saying it could be a planet made of diamonds. But what is Janssen actually like?