Key parameters at a glance
- A radius of 2.52 Earth radii
- A mass of 15.00 Earth masses
- Surface gravity around 2.36 g
- An orbital period of 9.050 days
- Semi-major axis 0.0707 AU
- Equilibrium temperature 533 K (260 °C)
- Distance from Earth 324.71 light-years
- Earth Similarity Index 0.409
- Travel time at Voyager 1 speed 5,726,229 years
- Almost certainly tidally locked to its host star given the close orbit
2 siblings around TOI-1749
TOI-1749 d shares its host star with 2 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| TOI-1749 b | Super-Earth | 1.39 | 57.00 | 2.388 | 831 | 2021 |
| TOI-1749 c | Sub-Neptune | 2.12 | 14.00 | 4.493 | 673 | 2021 |
| TOI-1749 d this | Sub-Neptune | 2.52 | 15.00 | 9.050 | 533 | 2021 |
TOI-1749 d Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1147of 1978
top 57.9%
This planet
2.52R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-1749 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.52 | 11.21 |
| Mass (M⊕) | 1.00 | 15.00 | 317.83 |
| Density (g/cm³) | 5.51 | — | 1.33 |
| Surface Gravity (g) | 1.00 | 2.36 | 2.53 |
| Insolation (S⊕) | 1.00 | 14.21 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 15.000 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 233602827
Gaia DR2
Gaia DR2 2253774094189458432
Gaia DR3
Gaia DR3 2253774094189458432
System
TOI-1749
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 9.05 Earth days (2.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0707 AU.
Transit Fingerprint
Depth
0.161 %
Duration
1.765 h
Impact parameter b
0.717
Rp / R★
0.042100
Transit midpoint (BJD)
2,459,647.5152
Photometric dip
Transit produces a flux drop of 1,611 ppm lasting ≈ 1.77 h.
Extended Orbital Architecture
Planet / star radius ratio
0.042100
Impact parameter (b)
0.717
Transit mid-time (BJD)
2,459,647.5152
Long. of periastron (ω)
40.00°
Angular separation (arcsec)
0.71000
Eq. Temperature
533K
(260 °C)
Insolation (S⊕)
14.21
Earth = 1.00
Earth Similarity (ESI)
0.409
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
Fukui et al. 2021Instrument
TESS CCD Array
Publication
2021-10
Observation locale
Space
Discovery cohort
Planets confirmed in 2021 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-1749
Spectral Class
M-type red dwarf
Effective Temperature
3,985 K — cooler than the Sun (5,778 K)
Estimated Age
0.80 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.550 R☉
Stellar Mass
0.580 M☉
Metallicity [Fe/H]
-0.26
Extended Stellar Properties
Surface gravity (log g)
4.700 dex
Stellar density
5.020 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
10.016 mas
Total Proper Motion
82.353 mas/yr
PM Right Ascension
-54.40 mas/yr
PM Declination
61.83 mas/yr
Galactic Cartesian (pc)
x = 0.095 · y = -0.421 · z = 0.902
Equatorial (J2000)
RA 282.73723° · Dec 64.41947°
Galactic ℓ, b
94.645° · 24.337°
Ecliptic λ, β
343.820° · 84.311°
HTM-20 index
1999216972
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