Key parameters at a glance
- A radius of 1.71 Earth radii
- A mass of 4.23 Earth masses
- Surface gravity around 1.45 g
- An orbital period of 13.476 days
- Semi-major axis 0.0943 AU
- Equilibrium temperature 493 K (220 °C)
- Distance from Earth 65.84 light-years
- Earth Similarity Index 0.585
- Travel time at Voyager 1 speed 1,161,004 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-260 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#385of 1176
top 32.7%
This planet
1.71R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | TOI-260 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.71 | 11.21 |
| Mass (M⊕) | 1.00 | 4.23 | 317.83 |
| Density (g/cm³) | 5.51 | 4.66 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.45 | 2.53 |
| Insolation (S⊕) | 1.00 | 10.18 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 4.230 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 37749396
Gaia DR2
Gaia DR2 2428162410789155328
Gaia DR3
Gaia DR3 2428162410789155328
System
TOI-260
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 13.48 Earth days (3.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0943 AU.
Transit Fingerprint
Depth
0.071 %
Duration
2.370 h
Impact parameter b
0.679
Rp / R★
0.025800
Transit midpoint (BJD)
2,458,392.2942
Photometric dip
Transit produces a flux drop of 709 ppm lasting ≈ 2.37 h.
Extended Orbital Architecture
Planet / star radius ratio
0.025800
Impact parameter (b)
0.679
RV semi-amplitude (K)
1.570 m/s
Transit mid-time (BJD)
2,458,392.2942
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
4.67000
Eq. Temperature
493K
(220 °C)
Insolation (S⊕)
10.18
Earth = 1.00
Earth Similarity (ESI)
0.585
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
Polanski et al. 2024Instrument
TESS CCD Array
Publication
2024-06
Observation locale
Space
Discovery cohort
Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-260
Spectral Class
K-type orange
Effective Temperature
4,026 K — cooler than the Sun (5,778 K)
Estimated Age
15.90 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.607 R☉
Stellar Mass
0.616 M☉
Metallicity [Fe/H]
-0.47
Extended Stellar Properties
Surface gravity (log g)
4.450 dex
Stellar density
4.697 g/cm³
Systemic radial velocity
3.30 km/s
Rotation period
31.00 days
Activity index (log R'HK)
-4.979
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
49.512 mas
Total Proper Motion
303.648 mas/yr
PM Right Ascension
-36.59 mas/yr
PM Declination
-301.44 mas/yr
Galactic Cartesian (pc)
x = 0.981 · y = 0.082 · z = -0.173
Equatorial (J2000)
RA 4.77302° · Dec -9.96615°
Galactic ℓ, b
97.443° · -71.219°
Ecliptic λ, β
0.367° · -11.034°
HTM-20 index
1917574237
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