55 Cancri d
Periastron 5.63 AU (842,000,000 km) | | |
5.77 ± 0.11 AU (863,000,000 ± 16,000,000 km)[1] | ||
Eccentricity | 0.025 ± 0.03[1] | |
5218 ± 230[1] d 14.29 y | ||
2,452,500.6 ± 230[1] | ||
181.3 ± 32[1] | ||
Semi-amplitude | 46.85 ± 1.8[1] | |
Star | 55 Cancri A | |
55 Cancri d (abbreviated 55 Cnc d), formally named Lipperhey
Name
In July 2014 the
Discovery
Like the majority of known extrasolar planets found at the time, 55 Cancri d was detected by observing changes in its star's
In 2002, further measurements revealed the presence of a long-period planet in an orbit at around 5 AU from the star.[7] The same measurements also indicated the presence of another inner planet, designated 55 Cancri c.
Orbit and mass
When 55 Cancri d was discovered, it was thought to be on a fairly low
A limitation of the radial velocity method used to discover 55 Cancri d is that only a lower limit on the planet's
Characteristics
Given the planet's high mass, the planet is a gas giant with no solid surface. Since the planet has only been detected indirectly, parameters such as its radius, composition, and temperature are unknown.
Assuming a composition similar to that of Jupiter and that the planet's atmosphere is close to chemical equilibrium, it is predicted that 55 Cancri d is covered in a layer of water clouds: the planet's internal heat probably keeps it too warm to form the ammonia-based clouds that are typical of Jupiter. Its surface gravity is likely to be about 4 to 5 times stronger than Jupiter, or about 10 to 15 times that of Earth which is because the radius of the planet is unlikely to be much more than Jupiter's and is probably slightly smaller than Jupiter due to the high metal content in the parent star.[10]
See also
- Appearance of extrasolar planets
- Cancer (Chinese astronomy)
- Lists of exoplanets
- Gliese 1132 b, Rocky exoplanet with a confirmed atmosphere.
- Mu Arae c, At constellation Ara
- Planetary system
References
- ^ S2CID 17083836.
- ^ NameExoWorlds: An IAU Worldwide Contest to Name Exoplanets and their Host Stars. IAU.org. 9 July 2014
- ^ "NameExoWorlds The Process". Archived from the original on 2015-08-15. Retrieved 2015-09-05.
- ^ a b Final Results of NameExoWorlds Public Vote Released, International Astronomical Union, 15 December 2015.
- ^ a b "NameExoWorlds The Approved Names". Archived from the original on 2018-02-01. Retrieved 2015-12-27.
- doi:10.1086/310444.
- ^ S2CID 16170184.
- ^ S2CID 119085463.
- .
- S2CID 16004653.
External links
- Jean Schneider (2011). "Notes for Planet 55 Cnc d". Extrasolar Planets Encyclopaedia. Retrieved 8 October 2011.