Key parameters at a glance
- A radius of 3.14 Earth radii
- A mass of 10.00 Earth masses
- Surface gravity around 1.01 g
- An orbital period of 15.941 days
- Semi-major axis 0.0997 AU
- Equilibrium temperature 407 K (134 °C)
- Distance from Earth 73.30 light-years
- Earth Similarity Index 0.540
- Travel time at Voyager 1 speed 1,292,714 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around GJ 3090
GJ 3090 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| GJ 3090 b | Sub-Neptune | 2.18 | 4.52 | 2.853 | 723 | 2022 |
| GJ 3090 c this | Sub-Neptune | 3.14 | 10.00 | 15.941 | 407 | 2026 |
GJ 3090 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#400of 1978
top 20.2%
This planet
3.14R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | GJ 3090 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.14 | 11.21 |
| Mass (M⊕) | 1.00 | 10.00 | 317.83 |
| Density (g/cm³) | 5.51 | 1.77 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.01 | 2.53 |
| Insolation (S⊕) | 1.00 | 4.58 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 10.000 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HIP
HIP 6365
TIC
TIC 262530407
Gaia DR2
Gaia DR2 4933912198893332224
Gaia DR3
Gaia DR3 4933912198895807104
System
GJ 3090
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 15.94 Earth days (4.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0997 AU.
Transit Fingerprint
Impact parameter b
2.220
Transit midpoint (BJD)
2,458,350.8300
Extended Orbital Architecture
Impact parameter (b)
2.220
RV semi-amplitude (K)
3.950 m/s
Transit mid-time (BJD)
2,458,350.8300
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
4.44000
Eq. Temperature
407K
(134 °C)
Insolation (S⊕)
4.58
Earth = 1.00
Earth Similarity (ESI)
0.540
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Radial velocity
Stellar wobble has been measured spectroscopically.
Discovery Paper
Primary reference
Lamontagne et al. 2026Instrument
Multiple Instruments
Publication
2026-01
Observation locale
Ground
Host System: GJ 3090
Spectral Class
M-type red dwarf
Effective Temperature
3,707 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.516 R☉
Stellar Mass
0.519 M☉
Metallicity [Fe/H]
0.12
Extended Stellar Properties
Surface gravity (log g)
4.727 dex
Stellar density
5.320 g/cm³
Rotational v·sin i
1.47 km/s
Rotation period
17.95 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
44.465 mas
Total Proper Motion
136.891 mas/yr
PM Right Ascension
-111.21 mas/yr
PM Declination
-79.83 mas/yr
Galactic Cartesian (pc)
x = 0.642 · y = 0.239 · z = -0.728
Equatorial (J2000)
RA 20.43843° · Dec -46.71472°
Galactic ℓ, b
287.952° · -69.522°
Ecliptic λ, β
353.787° · -49.740°
HTM-20 index
-656934947
Similar Worlds
TOI-1759 b
Sub-Neptune · M-type red dwarf
Radius 3.14 R⊕ · 130.7 ly
GJ 160.2 b
Sub-Neptune · M-type red dwarf
Radius 3.17 R⊕ · 84.3 ly
TOI-1696 b
Sub-Neptune · M-type red dwarf
Radius 3.09 R⊕ · 211.7 ly
GJ 9689 b
Sub-Neptune · M-type red dwarf
Radius 3.07 R⊕ · 99.9 ly
GJ 3138 d
Sub-Neptune · M-type red dwarf
Radius 3.23 R⊕ · 92.9 ly
GJ 1151 c
Sub-Neptune · M-type red dwarf
Radius 3.25 R⊕ · 26.2 ly