18 Del b
Orbiting 18 Del
18 Del b is an exoplanet orbiting the star 18 Del, discovered in 2008 using the Radial Velocity method.
Minimum Mass (M sin i)
2926.25
Earth masses
Orbital Period
982.9
days
Distance
76.2
parsecs
What these measurements mean
These comparisons use the reported catalog values. They are interpretations and calculations, not additional observations.
- A year on this world
- One orbit lasts about 2.69 Earth years. This comparison uses the reported orbital period. It does not measure the planet's rotation or the length of its day.
- What the mass can tell you
- M sin i is a lower bound on the true mass because the viewing angle affects the radial-velocity measurement. Do not treat it as an exact mass or use it to claim a measured density.
Radius (Earth radii)
Unknown
Minimum Mass, M sin(i) (Earth masses)
2926.25
Radial-velocity minimum
Equilibrium Temperature
Unknown
Parameter source: Teng et al. 2023
Orbital Period
982.850+1.060−0.920days
Semi-Major Axis
2.4760+0.0020−0.0020au
M sin(i) (Earth masses)
2926.25+50.85−24.47
M sin(i) (Jupiter masses)
9.2070+0.1600−0.0770
Eccentricity
0.0240+0.0070−0.0180
Epoch of Periastron
2454356.10+102.90−118.20days(JD)
Argument of Periastron
64.1+28.8−58.0deg
Radial Velocity Semi-Amplitude
114.96+1.98−0.96m/s
Distance from Earth
76.2 pc (~249 ly)
Spectral Type
G6 III
Temperature
4980 K
Mass (Solar)
2.10 M☉
Radius (Solar)
8.80 R☉
Luminosity
1.63 log L☉
Planets in System
1
Stars in System
2
Coordinates (RA, Dec)
314.6078°, 10.8391°
Discovery Method
Radial Velocity
Discovery Year
2008
Source ID: 18 Del b
18 Del b orbits 18 Del and was reported in 2008 and was detected with the Radial Velocity method.
Published measurements list a minimum mass of 2,926.25 Earth masses (M sin i) and an orbital period of 982.85 days.
Catalog data places the system at about 76.2 parsecs from Earth, a host star classified as G6 III, and 1 known planet in the system.
Host star
Explore the stellar record for this system to compare temperature, spectral type, and known planets.
Open 18 Del