Exoplanet

Gliese 48 b

Orbiting Gliese 48

Overview

Gliese 48 b is an exoplanet orbiting the star Gliese 48, discovered in 2026 using the Radial Velocity method.

Key Measurements

Minimum Mass (M sin i)

8.11

Earth masses

0500 M⊕

Orbital Period

39.6

days

0.1d10,000d

Distance

8.2

parsecs

Nearby10,000 pc

Equilibrium Temp

271

K

150 K3,500 K

What these measurements mean

These comparisons use the reported catalog values. They are interpretations and calculations, not additional observations.

A year on this world
A 365.25-day Earth year spans about 9.22 of these orbits. 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.
Temperature has limits
Equilibrium temperature describes a model of absorbed and emitted energy, not a measured surface temperature. Atmosphere and reflectivity affect the interpretation. This value alone cannot establish liquid water, a habitable surface, or life.
Work through an exoplanet comparisonArchive measurement definitions

Radius (Earth radii)

Unknown

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

8.11

Radial-velocity minimum

Equilibrium Temperature

271 K

Parameter source: Conzo et al. 2026

Orbital Period

39.630+0.290−0.290days

Semi-Major Axis

0.1752+0.0011−0.0011au

M sin(i) (Earth masses)

8.11+1.63−1.63

M sin(i) (Jupiter masses)

0.0255+0.0051−0.0051

Eccentricity

0.0000

Radial Velocity Semi-Amplitude

2.38+0.24−0.24m/s

Distance from Earth

8.2 pc (~27 ly)

Spectral Type

M3.5 V

Temperature

3450 K

Mass (Solar)

0.47 M☉

Radius (Solar)

0.46 R☉

Luminosity

-1.56 log L☉

Planets in System

1

Stars in System

1

Coordinates (RA, Dec)

15.6582°, 71.6782°

Discovery Method

Radial Velocity

Discovery Year

2026

Data Sources
NASA Exoplanet Archive

Source ID: Gliese 48 b

System Context

Gliese 48 b orbits Gliese 48 and was reported in 2026 and was detected with the Radial Velocity method.

Published measurements list a minimum mass of 8.11 Earth masses (M sin i), an orbital period of 39.63 days, and an equilibrium temperature near 271 K.

Catalog data places the system at about 8.2 parsecs from Earth, a host star classified as M3.5 V, 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 Gliese 48