Key parameters at a glance
- A radius of 1.93 Earth radii
- A mass of 5.10 Earth masses
- Surface gravity around 1.37 g
- An orbital period of 4.678 days
- Semi-major axis 0.0410 AU
- Equilibrium temperature 551 K (278 °C)
- Distance from Earth 85.15 light-years
- Earth Similarity Index 0.510
- Travel time at Voyager 1 speed 1,501,624 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-912 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#85of 1176
top 7.1%
This planet
1.93R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | TOI-912 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.93 | 11.21 |
| Mass (M⊕) | 1.00 | 5.10 | 317.83 |
| Density (g/cm³) | 5.51 | 4.00 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.37 | 2.53 |
| Insolation (S⊕) | 1.00 | 15.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 5.100 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 406941612
Gaia DR2
Gaia DR2 5772442647192375808
Gaia DR3
Gaia DR3 5772442647192375808
System
TOI-912
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.68 Earth days (1.3% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.0410 AU.
Transit Fingerprint
Depth
0.203 %
Duration
1.700 h
Impact parameter b
0.340
Rp / R★
0.042100
Transit midpoint (BJD)
2,458,628.4061
Photometric dip
Transit produces a flux drop of 2,029 ppm lasting ≈ 1.70 h.
Extended Orbital Architecture
Planet / star radius ratio
0.042100
Semi-major axis / stellar radius
20.700
Impact parameter (b)
0.340
RV semi-amplitude (K)
4.290 m/s
Transit mid-time (BJD)
2,458,628.4061
Long. of periastron (ω)
-169.00°
Angular separation (arcsec)
1.57000
Eq. Temperature
551K
(278 °C)
Insolation (S⊕)
15.00
Earth = 1.00
Earth Similarity (ESI)
0.510
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
Lacedelli et al. 2025Instrument
TESS CCD Array
Publication
2025-09
Observation locale
Space
Discovery cohort
Planets confirmed in 2025 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-912
Spectral Class
M-type red dwarf
Effective Temperature
3,572 K — cooler than the Sun (5,778 K)
Estimated Age
0.80 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.419 R☉
Stellar Mass
0.418 M☉
Metallicity [Fe/H]
-0.19
Extended Stellar Properties
Surface gravity (log g)
4.980 dex
Stellar density
7.754 g/cm³
Systemic radial velocity
10.47 km/s
Rotation period
45.90 days
Activity index (log R'HK)
-5.176
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 7 bands
Astrometric Data
Parallax
38.275 mas
Total Proper Motion
460.611 mas/yr
PM Right Ascension
-450.96 mas/yr
PM Declination
-93.82 mas/yr
Galactic Cartesian (pc)
x = -0.108 · y = -0.126 · z = -0.986
Equatorial (J2000)
RA 229.32857° · Dec -80.47334°
Galactic ℓ, b
308.917° · -19.344°
Ecliptic λ, β
257.996° · -58.748°
HTM-20 index
452162030
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