Key parameters at a glance
- A radius of 3.27 Earth radii
- A mass of 11.90 Earth masses
- Surface gravity around 1.11 g
- An orbital period of 13.079 days
- Semi-major axis 0.1090 AU
- Equilibrium temperature 727 K (454 °C)
- Distance from Earth 454.96 light-years
- Earth Similarity Index 0.317
- Travel time at Voyager 1 speed 8,023,131 years
TOI-1249 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#296of 1978
top 14.9%
This planet
3.27R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-1249 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.27 | 11.21 |
| Mass (M⊕) | 1.00 | 11.90 | 317.83 |
| Density (g/cm³) | 5.51 | 1.84 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.11 | 2.53 |
| Insolation (S⊕) | 1.00 | 48.61 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 11.900 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 232976128
Gaia DR2
Gaia DR2 1678371724905519744
Gaia DR3
Gaia DR3 1678371724905519744
System
TOI-1249
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 13.08 Earth days (3.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1090 AU.
Transit Fingerprint
Depth
0.114 %
Duration
3.145 h
Impact parameter b
0.636
Rp / R★
0.030647
Transit midpoint (BJD)
2,458,694.3804
Photometric dip
Transit produces a flux drop of 1,143 ppm lasting ≈ 3.15 h.
Extended Orbital Architecture
Planet / star radius ratio
0.030647
Impact parameter (b)
0.636
RV semi-amplitude (K)
3.200 m/s
Transit mid-time (BJD)
2,458,694.3804
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
0.78100
Eq. Temperature
727K
(454 °C)
Insolation (S⊕)
48.61
Earth = 1.00
Earth Similarity (ESI)
0.317
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
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-1249
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,497 K — cooler than the Sun (5,778 K)
Estimated Age
4.00 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.979 R☉
Stellar Mass
1.006 M☉
Metallicity [Fe/H]
0.30
Extended Stellar Properties
Surface gravity (log g)
4.457 dex
Stellar density
1.500 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
7.140 mas
Total Proper Motion
48.615 mas/yr
PM Right Ascension
-14.79 mas/yr
PM Declination
-46.31 mas/yr
Galactic Cartesian (pc)
x = -0.376 · y = -0.141 · z = 0.916
Equatorial (J2000)
RA 200.56158° · Dec 66.30853°
Galactic ℓ, b
118.072° · 50.528°
Ecliptic λ, β
148.030° · 63.675°
HTM-20 index
-1239039848
Similar Worlds
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Sub-Neptune · G-type yellow (Sun-like)
Radius 3.27 R⊕ · 546.6 ly
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Kepler-1085 c
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Kepler-1530 d
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Kepler-1080 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.28 R⊕ · 4,510.2 ly