Gliese 581 planetary system
Planets
Ongoing analysis of the system has produced several models for the orbitral arrangement of the system. There is no current consensus and 3-planet, 4-planet, 5-planet and 6-planet models have been proposed to address the available radial velocity data.

Gliese 581 planetary system

Section Title: Planets
Table Section Text: Ongoing analysis of the system has produced several models for the orbitral arrangement of the system. There is no current consensus and 3-planet, 4-planet, 5-planet and 6-planet models have been proposed to address the available radial velocity data.

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius

e	≥1.7 ± 0.2 M⊕	0.02815 ± 0.00006	3.1490 ± 0.0002	0.00–0.06	—	—

b	≥15.8 ± 0.3 M⊕	0.04061 ± 0.00003	5.3686 ± 0.0001	0.00–0.03	—	—

c	≥5.5 ± 0.3 M⊕	0.0721 ± 0.0003	12.914 ± 0.002	0.00–0.06	—	—

g (unconfirmed)	≥2.2 M⊕	0.13	32	0.00	—	—

d (unconfirmed)	6.98 ± 0.3 M⊕	0.21847 ± 0.00028	66.87 ± 0.13	0.00–0.25	—	—

Debris disk	25 ± 12 AU–>60 AU	30° – 70°	—

Sentence(s)

Gliese 581 planetary system's orbital period is thought to be 66.87 days long with a semi-major axis of 0.21847.

final_sentence: Gliese 581 planetary system's orbital period is thought to be 66.87 days long with a semi-major axis of 0.21847.