Key parameters at a glance
- A radius of 4.92 Earth radii
- A mass of 21.50 Earth masses
- Surface gravity around 0.89 g
- An orbital period of 50.089 days
- Distance from Earth 134.10 light-years
- Earth Similarity Index 0.481
- Travel time at Voyager 1 speed 2,364,928 years
1 sibling around TOI-544
TOI-544 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 |
|---|---|---|---|---|---|---|
| TOI-544 b | Sub-Neptune | 2.02 | 2.89 | 1.548 | 999 | 2022 |
| TOI-544 c this | Neptune-like | 4.92 | 21.50 | 50.089 | — | 2023 |
TOI-544 c Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#393of 574
top 68.3%
This planet
4.92R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | TOI-544 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 4.92 | 11.21 |
| Mass (M⊕) | 1.00 | 21.50 | 317.83 |
| Density (g/cm³) | 5.51 | 0.99 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.89 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 21.500 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 290498
TIC
TIC 50618703
Gaia DR2
Gaia DR2 3220926542276901888
Gaia DR3
Gaia DR3 3220926542276901888
System
TOI-544
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 50.09 Earth days (13.7% of a terrestrial year) on a highly eccentric trajectory.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.481
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Osborne et al. 2023Instrument
HARPS Spectrograph
Publication
2023-10
Observation locale
Ground
Discovery cohort
Planets confirmed in 2023 at La Silla Observatory (12 shown).
Host System: TOI-544
Spectral Class
K-type orange
Effective Temperature
4,169 K — cooler than the Sun (5,778 K)
Estimated Age
9.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.623 R☉
Stellar Mass
0.631 M☉
Metallicity [Fe/H]
-0.17
Extended Stellar Properties
Surface gravity (log g)
4.680 dex
Stellar density
3.187 g/cm³
Rotation period
19.34 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
24.292 mas
Total Proper Motion
85.327 mas/yr
PM Right Ascension
34.30 mas/yr
PM Declination
-78.13 mas/yr
Galactic Cartesian (pc)
x = 0.134 · y = 0.991 · z = -0.006
Equatorial (J2000)
RA 82.29007° · Dec -0.34290°
Galactic ℓ, b
203.539° · -18.386°
Ecliptic λ, β
81.581° · -23.557°
HTM-20 index
-1656622047
Similar Worlds
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