55 Cancri d

55 Cancri d / Lipperhey
	Radial velocity changes over time of 55 Cancri caused by the orbit of 55 Cancri d.
Discovery
Discovered by	Marcy et al.
Discovery site	California, USA
Discovery date	June 13, 2002
Detection method	Radial velocity
Orbital characteristics
Apastron	5.92 AU (886,000,000 km)
Periastron	5.63 AU (842,000,000 km)
Semi-major axis	5.77 ± 0.11 AU (863,000,000 ± 16,000,000 km)
Eccentricity	0.025 ± 0.03
Orbital period (sidereal)	5218 ± 230 d; 14.29 y
Time of periastron	2,452,500.6 ± 230
Argument of periastron	181.3 ± 32
Semi-amplitude	46.85 ± 1.8
Star	55 Cancri A

55 Cancri d (abbreviated 55 Cnc d), formally named Lipperhey /ˈlɪpərhiː/, is an extrasolar planet in a long-period orbit around the Sun-like star 55 Cancri A. Located at a similar distance from its star as Jupiter is from the Sun, it is the fifth and outermost known planet in its planetary system. 55 Cancri d was discovered on June 13, 2002.

^ ^a ^b ^c ^d ^e ^f D.A. Fischer; et al. (March 2008). "Five Planets Orbiting 55 Cancri". Astrophysical Journal. 675 (1): 790–801. arXiv:0712.3917. Bibcode:2008ApJ...675..790F. doi:10.1086/525512. S2CID 17083836.

[fischer-1] ^ ^a ^b ^c ^d ^e ^f D.A. Fischer; et al. (March 2008). "Five Planets Orbiting 55 Cancri". Astrophysical Journal. 675 (1): 790–801. arXiv:0712.3917. Bibcode:2008ApJ...675..790F. doi:10.1086/525512. S2CID 17083836.

[1]