Key parameters at a glance
- A radius of 13.00 Earth radii
- A mass of 1,287.21 Earth masses
- Surface gravity around 7.62 g
- An orbital period of 149.400 days
- Semi-major axis 0.4390 AU
- Equilibrium temperature 194 K (-79 °C)
- Distance from Earth 281.07 light-years
- Earth Similarity Index 0.383
- Travel time at Voyager 1 speed 4,956,632 years
1 sibling around TOI-756
TOI-756 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| TOI-756 b | Sub-Neptune | 2.81 | 9.83 | 1.239 | 934 | 2025 |
| TOI-756 c this | Gas Giant | 13.00 | 1,287.21 | 149.400 | 194 | 2025 |
TOI-756 c Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#960of 1771
top 54.2%
This planet
13.00R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-756 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 13.00 | 11.21 |
| Mass (M⊕) | 1.00 | 1,287.21 | 317.83 |
| Density (g/cm³) | 5.51 | 3.22 | 1.33 |
| Surface Gravity (g) | 1.00 | 7.62 | 2.53 |
| Insolation (S⊕) | 1.00 | 0.24 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 1,287.205 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
TIC
TIC 73649615
Gaia DR2
Gaia DR2 6129327525817451648
Gaia DR3
Gaia DR3 6129327525817451648
System
TOI-756
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 149.40 Earth days (40.9% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.4390 AU.
Extended Orbital Architecture
RV semi-amplitude (K)
273.300 m/s
Transit mid-time (BJD)
2,460,498.8820
Long. of periastron (ω)
-167.77°
Angular separation (arcsec)
5.09000
Eq. Temperature
194K
(-79 °C)
Insolation (S⊕)
0.24
Earth = 1.00
Earth Similarity (ESI)
0.383
0 = alien, 1 = Earth-identical
Beyond the outer HZ boundary (too cold) — surface water would be frozen.
Discovery Paper
Primary reference
Parc et al. 2025Instrument
Multiple Instruments
Publication
2025-10
Observation locale
Ground
Discovery cohort
Planets confirmed in 2025 at La Silla Observatory (12 shown).
Host System: TOI-756
Spectral Class
M-type red dwarf
Effective Temperature
3,657 K — cooler than the Sun (5,778 K)
Estimated Age
3.20 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.505 R☉
Stellar Mass
0.505 M☉
Metallicity [Fe/H]
0.20
Extended Stellar Properties
Surface gravity (log g)
4.735 dex
Stellar density
5.520 g/cm³
Systemic radial velocity
15.36 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
11.576 mas
Total Proper Motion
218.335 mas/yr
PM Right Ascension
-216.37 mas/yr
PM Declination
29.21 mas/yr
Galactic Cartesian (pc)
x = -0.686 · y = -0.147 · z = -0.713
Equatorial (J2000)
RA 192.10374° · Dec -45.47047°
Galactic ℓ, b
302.377° · 17.398°
Ecliptic λ, β
211.392° · -36.553°
HTM-20 index
-650066536
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