Key parameters at a glance
- A radius of 9.61 Earth radii
- A mass of 124.91 Earth masses
- Surface gravity around 1.35 g
- An orbital period of 69.337 days
- Semi-major axis 0.3470 AU
- Equilibrium temperature 414 K (141 °C)
- Distance from Earth 485.93 light-years
- Earth Similarity Index 0.355
- Travel time at Voyager 1 speed 8,569,376 years
TOI-2447 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#32of 574
top 5.4%
This planet
9.61R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | TOI-2447 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 9.61 | 11.21 |
| Mass (M⊕) | 1.00 | 124.91 | 317.83 |
| Density (g/cm³) | 5.51 | 0.77 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.35 | 2.53 |
| Insolation (S⊕) | 1.00 | 44.59 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 124.907 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 1167538
Gaia DR2
Gaia DR2 4877544322252002048
Gaia DR3
Gaia DR3 4877544322252002048
System
TOI-2447
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 69.34 Earth days (19.0% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.3470 AU.
Transit Fingerprint
Depth
0.874 %
Duration
7.160 h
Impact parameter b
0.277
Rp / R★
0.087040
Transit midpoint (BJD)
2,459,168.9880
Photometric dip
Transit produces a flux drop of 8,735 ppm lasting ≈ 7.16 h.
Extended Orbital Architecture
Planet / star radius ratio
0.087040
Semi-major axis / stellar radius
77.821
Impact parameter (b)
0.277
RV semi-amplitude (K)
18.800 m/s
Transit mid-time (BJD)
2,459,168.9880
Long. of periastron (ω)
-105.00°
Angular separation (arcsec)
2.33000
Eq. Temperature
414K
(141 °C)
Insolation (S⊕)
44.59
Earth = 1.00
Earth Similarity (ESI)
0.355
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.
Transit timing variations
Gravitational interactions from neighbours have been detected.
Discovery Paper
Primary reference
Gill et al. 2024Instrument
TESS CCD Array
Publication
2024-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-2447
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,730 K — cooler than the Sun (5,778 K)
Estimated Age
2.10 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.006 R☉
Stellar Mass
1.034 M☉
Metallicity [Fe/H]
0.18
Extended Stellar Properties
Surface gravity (log g)
4.300 dex
Stellar density
1.319 g/cm³
Rotational v·sin i
3.50 km/s
Rotation period
13.00 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
6.683 mas
Total Proper Motion
31.567 mas/yr
PM Right Ascension
-0.42 mas/yr
PM Declination
-31.56 mas/yr
Galactic Cartesian (pc)
x = 0.276 · y = 0.803 · z = -0.529
Equatorial (J2000)
RA 70.99759° · Dec -31.90664°
Galactic ℓ, b
233.187° · -39.779°
Ecliptic λ, β
62.282° · -53.533°
HTM-20 index
1712036889
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