Key parameters at a glance
- A radius of 2.66 Earth radii
- A mass of 10.60 Earth masses
- Surface gravity around 1.50 g
- An orbital period of 9.614 days
- Semi-major axis 0.0850 AU
- Equilibrium temperature 759 K (486 °C)
- Distance from Earth 349.17 light-years
- Earth Similarity Index 0.339
- Travel time at Voyager 1 speed 6,157,547 years
TOI-1279 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#926of 1978
top 46.8%
This planet
2.66R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-1279 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.66 | 11.21 |
| Mass (M⊕) | 1.00 | 10.60 | 317.83 |
| Density (g/cm³) | 5.51 | 3.05 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.50 | 2.53 |
| Insolation (S⊕) | 1.00 | 74.74 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 10.600 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 224297258
Gaia DR2
Gaia DR2 1574358783911530624
Gaia DR3
Gaia DR3 1574358783911530624
System
TOI-1279
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 9.61 Earth days (2.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0850 AU.
Transit Fingerprint
Depth
0.093 %
Duration
2.765 h
Impact parameter b
0.498
Rp / R★
0.028958
Transit midpoint (BJD)
2,458,717.4814
Photometric dip
Transit produces a flux drop of 934 ppm lasting ≈ 2.76 h.
Extended Orbital Architecture
Planet / star radius ratio
0.028958
Impact parameter (b)
0.498
RV semi-amplitude (K)
3.500 m/s
Transit mid-time (BJD)
2,458,717.4814
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
0.79400
Eq. Temperature
759K
(486 °C)
Insolation (S⊕)
74.74
Earth = 1.00
Earth Similarity (ESI)
0.339
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-1279
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,457 K — cooler than the Sun (5,778 K)
Estimated Age
4.20 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.843 R☉
Stellar Mass
0.878 M☉
Metallicity [Fe/H]
-0.08
Extended Stellar Properties
Surface gravity (log g)
4.529 dex
Stellar density
2.055 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
9.312 mas
Total Proper Motion
143.872 mas/yr
PM Right Ascension
-130.49 mas/yr
PM Declination
60.60 mas/yr
Galactic Cartesian (pc)
x = -0.554 · y = -0.049 · z = 0.831
Equatorial (J2000)
RA 185.06287° · Dec 56.20141°
Galactic ℓ, b
131.718° · 60.392°
Ecliptic λ, β
152.736° · 51.440°
HTM-20 index
519243041
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Kepler-1924 b
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