Key parameters at a glance
- A radius of 2.40 Earth radii
- A mass of 6.40 Earth masses
- Surface gravity around 1.11 g
- An orbital period of 4.253 days
- Semi-major axis 0.0496 AU
- Equilibrium temperature 1,005 K (732 °C)
- Distance from Earth 561.44 light-years
- Earth Similarity Index 0.253
- Travel time at Voyager 1 speed 9,900,966 years
TOI-1269 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1331of 1978
top 67.2%
This planet
2.40R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-1269 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.40 | 11.21 |
| Mass (M⊕) | 1.00 | 6.40 | 317.83 |
| Density (g/cm³) | 5.51 | 2.53 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.11 | 2.53 |
| Insolation (S⊕) | 1.00 | 231.20 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 6.400 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 198241702
Gaia DR2
Gaia DR2 1635108588053258752
Gaia DR3
Gaia DR3 1635108588053258752
System
TOI-1269
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.25 Earth days (1.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0496 AU.
Transit Fingerprint
Depth
0.076 %
Duration
2.622 h
Impact parameter b
0.355
Rp / R★
0.025837
Transit midpoint (BJD)
2,458,686.6059
Photometric dip
Transit produces a flux drop of 759 ppm lasting ≈ 2.62 h.
Extended Orbital Architecture
Planet / star radius ratio
0.025837
Impact parameter (b)
0.355
RV semi-amplitude (K)
2.700 m/s
Transit mid-time (BJD)
2,458,686.6059
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
0.28800
Eq. Temperature
1,005K
(732 °C)
Insolation (S⊕)
231.20
Earth = 1.00
Earth Similarity (ESI)
0.253
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
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-1269
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,499 K — cooler than the Sun (5,778 K)
Estimated Age
3.10 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.852 R☉
Stellar Mass
0.903 M☉
Metallicity [Fe/H]
-0.05
Extended Stellar Properties
Surface gravity (log g)
4.531 dex
Stellar density
2.043 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
5.780 mas
Total Proper Motion
115.040 mas/yr
PM Right Ascension
-40.01 mas/yr
PM Declination
107.86 mas/yr
Galactic Cartesian (pc)
x = -0.149 · y = -0.403 · z = 0.903
Equatorial (J2000)
RA 249.69664° · Dec 64.55918°
Galactic ℓ, b
95.625° · 38.382°
Ecliptic λ, β
184.002° · 81.406°
HTM-20 index
-1821374866
Similar Worlds
Kepler-129 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.40 R⊕ · 1,333.5 ly
Kepler-666 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.40 R⊕ · 4,920.7 ly
Kepler-864 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.40 R⊕ · 6,597.8 ly
HD 224018 d
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.40 R⊕ · 344.0 ly
K2-187 d
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.40 R⊕ · 1,079.3 ly
Kepler-112 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.40 R⊕ · 1,673.9 ly