Key parameters at a glance
- A radius of 1.08 Earth radii
- A mass of 1.44 Earth masses
- Surface gravity around 1.24 g
- An orbital period of 0.238 days
- Equilibrium temperature 1,256 K (983 °C)
- Distance from Earth 66.26 light-years
- Earth Similarity Index 0.243
- Travel time at Voyager 1 speed 1,168,568 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-6255 b Planet Profile
Physical Specs
Classification
Planet Type
Rocky Terrestrial
Discovery
Size rank in cohort
Rank by radius
#256of 570
top 44.7%
This planet
1.08R⊕
Rocky Terrestrial median
1.01R⊕
Nearest-size peers
| Metric | Earth | TOI-6255 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.08 | 11.21 |
| Mass (M⊕) | 1.00 | 1.44 | 317.83 |
| Density (g/cm³) | 5.51 | 6.30 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.24 | 2.53 |
| Insolation (S⊕) | 1.00 | 588.99 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 1.440 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 261135533
Gaia DR2
Gaia DR2 1956328333130770048
Gaia DR3
Gaia DR3 1956328333130770048
System
TOI-6255
Percentile among Rocky Terrestrial cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts roughly 5.7 hours long on a nearly circular orbit.
Transit Fingerprint
Depth
0.049 %
Duration
0.476 h
Impact parameter b
0.840
Rp / R★
0.026700
Transit midpoint (BJD)
2,458,738.7125
Photometric dip
Transit produces a flux drop of 494 ppm lasting ≈ 0.48 h.
Extended Orbital Architecture
Planet / star radius ratio
0.026700
Semi-major axis / stellar radius
3.100
Impact parameter (b)
0.840
RV semi-amplitude (K)
2.980 m/s
Transit mid-time (BJD)
2,458,738.7125
Eq. Temperature
1,256K
(983 °C)
Insolation (S⊕)
588.99
Earth = 1.00
Earth Similarity (ESI)
0.243
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. 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
Dai et al. 2024Instrument
TESS CCD Array
Publication
2024-09
Observation locale
Space
Discovery cohort
Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-6255
Spectral Class
M-type red dwarf
Effective Temperature
3,421 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.370 R☉
Stellar Mass
0.353 M☉
Metallicity [Fe/H]
-0.14
Extended Stellar Properties
Surface gravity (log g)
4.850 dex
Stellar density
9.800 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 7 bands
Astrometric Data
Parallax
49.192 mas
Total Proper Motion
464.103 mas/yr
PM Right Ascension
69.19 mas/yr
PM Declination
-458.92 mas/yr
Galactic Cartesian (pc)
x = 0.680 · y = -0.369 · z = 0.633
Equatorial (J2000)
RA 331.50316° · Dec 39.29883°
Galactic ℓ, b
91.252° · -13.189°
Ecliptic λ, β
352.722° · 46.716°
HTM-20 index
-532466254
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Wolf 1069 b
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TOI-700 d
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Rocky Terrestrial · M-type red dwarf
Radius 1.07 R⊕ · 579.2 ly