Exoplanet

HD 126105 b

Orbiting HD 126105

Overview

HD 126105 b is an exoplanet orbiting the star HD 126105, discovered in 2026 using the Radial Velocity method.

Key Measurements

Minimum Mass (M sin i)

530.77

Earth masses

0500 M⊕

Orbital Period

524.0

days

0.1d10,000d

Distance

82.9

parsecs

Nearby10,000 pc

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 1.43 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.
Work through an exoplanet comparisonArchive measurement definitions

Radius (Earth radii)

Unknown

Minimum Mass, M sin(i) (Earth masses)

530.77

Radial-velocity minimum

Equilibrium Temperature

Unknown

Parameter source: Wittenmyer et al. 2026

Orbital Period

524.000+2.900−2.900days

Semi-Major Axis

1.3600+0.0500−0.0600au

M sin(i) (Earth masses)

530.77+60.39−54.03

M sin(i) (Jupiter masses)

1.6700+0.1900−0.1700

Eccentricity

0.1030+0.0830−0.0690

Epoch of Periastron

2455291.00+55.00−82.00days(BJD)

Argument of Periastron

155.0+45.0−45.0deg

Radial Velocity Semi-Amplitude

37.20+2.80−2.60m/s

Distance from Earth

82.9 pc (~270 ly)

Spectral Type

K1 III

Temperature

4875 K

Mass (Solar)

1.20 M☉

Radius (Solar)

4.21 R☉

Luminosity

0.95 log L☉

Planets in System

1

Stars in System

1

Coordinates (RA, Dec)

216.0017°, -19.8011°

Discovery Method

Radial Velocity

Discovery Year

2026

Data Sources
NASA Exoplanet Archive

Source ID: HD 126105 b

System Context

HD 126105 b orbits HD 126105 and was reported in 2026 and was detected with the Radial Velocity method.

Published measurements list a minimum mass of 530.77 Earth masses (M sin i) and an orbital period of 524 days.

Catalog data places the system at about 82.9 parsecs from Earth, a host star classified as K1 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 HD 126105