Key parameters at a glance
- A radius of 2.34 Earth radii
- A mass of 6.54 Earth masses
- Surface gravity around 1.19 g
- An orbital period of 17.617 days
- Semi-major axis 0.1230 AU
- Equilibrium temperature 661 K (388 °C)
- Distance from Earth 269.74 light-years
- Earth Similarity Index 0.396
- Travel time at Voyager 1 speed 4,756,781 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-283 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1429of 1978
top 72.2%
This planet
2.34R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-283 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.34 | 11.21 |
| Mass (M⊕) | 1.00 | 6.54 | 317.83 |
| Density (g/cm³) | 5.51 | 2.81 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.19 | 2.53 |
| Insolation (S⊕) | 1.00 | 30.40 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 6.540 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 382626661
Gaia DR2
Gaia DR2 5275527747224425344
Gaia DR3
Gaia DR3 5275527747228841344
System
TOI-283
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 17.62 Earth days (4.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1230 AU.
Transit Fingerprint
Depth
0.072 %
Duration
3.615 h
Impact parameter b
0.476
Rp / R★
0.025200
Transit midpoint (BJD)
2,459,549.0822
Photometric dip
Transit produces a flux drop of 722 ppm lasting ≈ 3.62 h.
Extended Orbital Architecture
Planet / star radius ratio
0.025200
Semi-major axis / stellar radius
31.120
Impact parameter (b)
0.476
RV semi-amplitude (K)
1.860 m/s
Transit mid-time (BJD)
2,459,549.0822
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
1.49000
Eq. Temperature
661K
(388 °C)
Insolation (S⊕)
30.40
Earth = 1.00
Earth Similarity (ESI)
0.396
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
Murgas et al. 2025Instrument
TESS CCD Array
Publication
2025-10
Observation locale
Space
Discovery cohort
Planets confirmed in 2025 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-283
Spectral Class
K-type orange
Effective Temperature
5,213 K — cooler than the Sun (5,778 K)
Estimated Age
10.40 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.850 R☉
Stellar Mass
0.800 M☉
Metallicity [Fe/H]
-0.09
Extended Stellar Properties
Surface gravity (log g)
4.500 dex
Stellar density
1.830 g/cm³
Systemic radial velocity
-12.64 km/s
Rotation period
30.00 days
Activity index (log R'HK)
-4.920
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
12.063 mas
Total Proper Motion
34.609 mas/yr
PM Right Ascension
-30.77 mas/yr
PM Declination
15.84 mas/yr
Galactic Cartesian (pc)
x = -0.199 · y = 0.365 · z = -0.910
Equatorial (J2000)
RA 118.56931° · Dec -65.44148°
Galactic ℓ, b
278.003° · -18.335°
Ecliptic λ, β
187.703° · -78.430°
HTM-20 index
584384701
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