Exoplanet

AT2021ueyL b

Orbiting AT2021ueyL

Overview

AT2021ueyL b is an exoplanet orbiting the star AT2021ueyL, discovered in 2025 using the Microlensing method.

Key Measurements

Mass

425.89

Earth masses

0500 M⊕

Orbital Period

4168.7

days

0.1d10,000d

Distance

1040.0

parsecs

Nearby10,000 pc

Radius (Earth radii)

Unknown

Mass (Earth masses)

425.89

Measured

Equilibrium Temperature

Unknown

Parameter source: Ban et al. 2025

Orbital Period

4168.690+2910.760−1713.980days

Semi-Major Axis

4.0100+1.6800−1.3400au

Planet Mass (Earth masses)

425.89+143.02−158.91

Planet Mass (Jupiter masses)

1.3400+0.4500−0.5000

Distance from Earth

1040.0 pc (~3392 ly)

Spectral Type

M V

Temperature

3680 K

Mass (Solar)

0.49 M☉

Radius (Solar)

Unknown

Luminosity

Unknown

Planets in System

1

Stars in System

1

Coordinates (RA, Dec)

324.5450°, 26.4666°

Discovery Method

Microlensing

Discovery Year

2025

Data Sources
NASA Exoplanet Archive

Source ID: AT2021ueyL b

System Context

AT2021ueyL b orbits AT2021ueyL and was reported in 2025 and was detected with the Microlensing method.

Published measurements list a mass of 425.89 Earth masses and an orbital period of 4,168.69 days.

Catalog data places the system at about 1,040 parsecs from Earth, a host star classified as M 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 AT2021ueyL