55 Cancri
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The binary star system 55 Cancri is located 41 lightyears from the Solar system.[1] It is found in the constellation Cancer.
The largest star, 55 Cancri A, is a yellow dwarf star, about the same mass as Sol, our sun.[1] 55 Cancri B is a red dwarf star, about 25 percent the mass of Sol.
Exoplanets have been detected orbiting both 55 Cancri A and 55 Cancri B.[1][2] Both stars are suspected of being orbited by a planet in its habitable zone.
| name | primary | mass | period | oribital radius |
habitable zone? |
notes |
|---|---|---|---|---|---|---|
| 55 Cancri B b | 55 Cancri B | 3.5 | 6.8 days | 0.044 | ||
| 55 Cancri B c | 55 Cancri B | 5.3 | 33.7 days | 0.13 | ||
| 55 Cancri A b | 55 Cancri A | 0.113 | ||||
| 55 Cancri A c | 55 Cancri A | 0.237 | ||||
| 55 Cancri A d | 55 Cancri A | 5.45 | ||||
| 55 Cancri A e | 55 Cancri A | 8.591 | 0.736547 days | 0.015439 | ||
| 55 Cancri A f | 55 Cancri A | 49.263 | 260 days | 0.781 | Yes |
|
| 55 Cancri A g | 55 Cancri A | 286 | 2.08 |
| ||
| 55 Cancri A h | 55 Cancri A | 635 | 48 years |
|
References
[edit | edit source]- ↑ 1.0 1.1 1.2
"★ 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.
- ↑
"A Grand Tour of 55 Cancri". YouTube. Kyplanet. 2026-06-15. Archived from the original on 2026-06-15. Retrieved 2026-07-15.
The 55 Cancri system is home to the planet Janssen (55 Cancri e), a planet that's supposedly made of diamonds. But is this actually true, and waht about the rest of the 55 Cancri planets?
- ↑
"⬤ 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.
- ↑
"⬤ Exoplanet 55 Cancri A f". Stellar Catalog. 2022-11-12. Retrieved 2026-07-17.
Exoplanet 55 Cancri A f orbits star 55 Cancri A that lies 41 light years away from the Sun. It weighs about 49.263 Earth masses and orbits its star closer than Earth orbits Sun.
- ↑ 6.0 6.1
"Steam Workshop::New Exoplanets in the 55 Cancri System". Steam Community. 2025-10-19. Retrieved 2026-07-17.
For Copernicus (55 Cancri A), one of the exoplanets, dubbed 55 Cancri Ag, would have an orbit close to Lipperhey and have 90% Jupiter's mass, though it may be closer in as more evidence is needed to fully confirm it. Next, there is a candidate planet that orbits Copernicus farther than Lipperhey, having a 48 year orbit. This planet, unoficially given the name 55 Cancri Ah, would be about twice the mass of Jupiter.