GJ 3998 d · Asteria Star

Scientific overview

GJ 3998 d is a super-earth orbiting GJ 3998, completing an orbit every 42 days, about 59 light-years from Earth. It was discovered in 2025 using the radial velocity method.

Host star

GJ 3998

Spectral type

M1

Temperature

3,726 K

Mass

0.52 M☉

Planetary system — GJ 3998 system

View the GJ 3998 system (3 known planets).

Planet	Class	Radius (R⊕)	Period (d)	Distance (ly)
GJ 3998 bRadial Velocity · 2016	Terrestrial planet	1.39	2.6503	59
GJ 3998 cRadial Velocity · 2016	Mini-Neptune	2.5	13.727	59
GJ 3998 dRadial Velocity · 2025	Super-Earth	2.34	41.78	59

Discovery and detection

Detection method

Radial Velocity Method

Discovery year

2025

Knowledge connections

OrbitsGJ 3998
Member of systemGJ 3998 system
Discovered by methodRadial Velocity Method
Catalogued inNASA Exoplanet Archive

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