Key parameters at a glance
- A radius of 1.79 Earth radii
- A mass of 3.87 Earth masses
- Surface gravity around 1.21 g
- An orbital period of 3.931 days
- Semi-major axis 0.0365 AU
- Equilibrium temperature 568 K (295 °C)
- Distance from Earth 154.11 light-years
- Earth Similarity Index 0.499
- Travel time at Voyager 1 speed 2,717,684 years
- Almost certainly tidally locked to its host star given the close orbit
Context from the literature
TOI-1846 b is a confirmed exoplanet discovered using NASA's Transiting Exoplanet Survey Satellite (TESS). It orbits a star in the constellation of Aries and is one of the numerous small exoplanets that populate the "radius valley," a gap in the size distribution of exoplanets that separates rocky super-Earths from gaseous sub-Neptunes. TOI-1846 b is particularly important for ongoing studies of planetary formation and evolution.
Excerpted from Wikipedia · full article
TOI-1846 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#269of 1176
top 22.8%
This planet
1.79R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | TOI-1846 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.79 | 11.21 |
| Mass (M⊕) | 1.00 | 3.87 | 317.83 |
| Density (g/cm³) | 5.51 | 3.70 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.21 | 2.53 |
| Insolation (S⊕) | 1.00 | 17.35 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 198385543
Gaia DR2
Gaia DR2 1420011162670761600
Gaia DR3
Gaia DR3 1420011162670761600
System
TOI-1846
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.93 Earth days (1.1% of a terrestrial year) at a mean orbital distance of 0.0365 AU.
Transit Fingerprint
Depth
0.171 %
Duration
1.419 h
Impact parameter b
0.464
Rp / R★
0.041370
Transit midpoint (BJD)
2,459,565.9552
Photometric dip
Transit produces a flux drop of 1,712 ppm lasting ≈ 1.42 h.
Extended Orbital Architecture
Planet / star radius ratio
0.041370
Semi-major axis / stellar radius
19.750
Impact parameter (b)
0.464
Transit mid-time (BJD)
2,459,565.9552
Angular separation (arcsec)
0.77200
Eq. Temperature
568K
(295 °C)
Insolation (S⊕)
17.35
Earth = 1.00
Earth Similarity (ESI)
0.499
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.
Discovery Paper
Primary reference
Soubkiou et al. 2025Instrument
TESS CCD Array
Publication
2025-06
Observation locale
Space
Discovery cohort
Planets confirmed in 2025 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-1846
Spectral Class
M-type red dwarf
Effective Temperature
3,568 K — cooler than the Sun (5,778 K)
Estimated Age
7.20 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.397 R☉
Stellar Mass
0.418 M☉
Metallicity [Fe/H]
0.17
Extended Stellar Properties
Surface gravity (log g)
4.862 dex
Stellar density
9.430 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
21.135 mas
Total Proper Motion
220.118 mas/yr
PM Right Ascension
-61.63 mas/yr
PM Declination
211.32 mas/yr
Galactic Cartesian (pc)
x = -0.121 · y = -0.568 · z = 0.814
Equatorial (J2000)
RA 257.95496° · Dec 54.52785°
Galactic ℓ, b
82.299° · 36.075°
Ecliptic λ, β
238.384° · 76.642°
HTM-20 index
1306803982
Similar Worlds
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Radius 1.79 R⊕ · 617.4 ly
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TOI-776 b
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GJ 251 c
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