Key parameters at a glance
- A radius of 9.10 Earth radii
- A mass of 96.40 Earth masses
- Surface gravity around 1.16 g
- An orbital period of 8.158 days
- Semi-major axis 0.0711 AU
- Equilibrium temperature 919 K (646 °C)
- Distance from Earth 357.33 light-years
- Earth Similarity Index 0.167
- Travel time at Voyager 1 speed 6,301,457 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-1268 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#80of 574
top 13.8%
This planet
9.10R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | TOI-1268 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 9.10 | 11.21 |
| Mass (M⊕) | 1.00 | 96.40 | 317.83 |
| Density (g/cm³) | 5.51 | 0.71 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.16 | 2.53 |
| Insolation (S⊕) | 1.00 | 91.10 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 96.400 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 142394656
Gaia DR2
Gaia DR2 1675923005135391488
Gaia DR3
Gaia DR3 1675923009431370880
System
TOI-1268
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 8.16 Earth days (2.2% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0711 AU.
Transit Fingerprint
Depth
0.819 %
Duration
4.001 h
Impact parameter b
0.423
Rp / R★
0.091000
Transit midpoint (BJD)
2,458,711.7477
Photometric dip
Transit produces a flux drop of 8,186 ppm lasting ≈ 4.00 h.
Extended Orbital Architecture
Planet / star radius ratio
0.091000
Semi-major axis / stellar radius
16.620
Impact parameter (b)
0.423
RV semi-amplitude (K)
31.700 m/s
Transit mid-time (BJD)
2,458,711.7477
Long. of periastron (ω)
-40.60°
Sky-projected obliquity (λ)
40.00°
Angular separation (arcsec)
0.64900
Eq. Temperature
919K
(646 °C)
Insolation (S⊕)
91.10
Earth = 1.00
Earth Similarity (ESI)
0.167
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
Dong et al. 2022Instrument
TESS CCD Array
Publication
2022-02
Observation locale
Space
Discovery cohort
Planets confirmed in 2022 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-1268
Spectral Class
K-type orange
Effective Temperature
5,300 K — cooler than the Sun (5,778 K)
Estimated Age
0.24 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.920 R☉
Stellar Mass
0.960 M☉
Metallicity [Fe/H]
0.36
Extended Stellar Properties
Surface gravity (log g)
4.550 dex
Stellar density
1.310 g/cm³
Systemic radial velocity
-47.22 km/s
Rotational v·sin i
4.12 km/s
Rotation period
10.90 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
9.099 mas
Total Proper Motion
68.718 mas/yr
PM Right Ascension
-66.99 mas/yr
PM Declination
-15.32 mas/yr
Galactic Cartesian (pc)
x = -0.441 · y = -0.147 · z = 0.885
Equatorial (J2000)
RA 198.38858° · Dec 62.30538°
Galactic ℓ, b
118.495° · 54.632°
Ecliptic λ, β
153.725° · 60.539°
HTM-20 index
-570509788
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