Rho Indi b

Rho Indi b is an exoplanet that orbits around Rho Indi. Its semimajor axis is 2.54 AU placing just outside the star's habitable zone. The planet takes 3.7 years to orbit the star. It is over twice as massive as Jupiter. Since the inclination of the orbit to the line-of-sight was initially unknown, only a lower bound on the planet's mass could be determined.^[1] In 2023, the inclination and true mass of Rho Indi b were determined via astrometry.^[2]

Rho Indi b

Discovery[1]
Discovered by	Jones et al.
Discovery site	Australia
Discovery date	Sept 17, 2002
Detection method	Doppler Spectroscopy
Designations
Alternative names	HD 216437 b HIP 113137 b
Orbital characteristics[2]
Semi-major axis	2.501+0.036 −0.037 AU
Eccentricity	0.318±0.028
Orbital period (sidereal)	1336±12 d 3.658±0.034 yr
Average orbital speed	19.92 km/s
Inclination	35.0°+10.0° −6.1° or 145.0°+6.1° −10.0°
Angular distance	95.698 mas
Longitude of ascending node	117.0°±14.0°
Time of periastron	2,455,959+38 −35 JD
Argument of periastron	64.5°+5.5° −5.4°
Semi-amplitude	39.0±1.0 m/s
Star	Rho Indi
Physical characteristics[2]
Mass	3.88±0.73 MJ

See also

• Tau¹ Gruis b