Key parameters at a glance
- A radius of 3.51 Earth radii
- A mass of 12.10 Earth masses
- Surface gravity around 0.98 g
- An orbital period of 3.686 days
- Semi-major axis 0.0464 AU
- Equilibrium temperature 1,250 K (977 °C)
- Distance from Earth 707.79 light-years
- Earth Similarity Index 0.170
- Travel time at Voyager 1 speed 12,481,953 years
1 sibling around TIC 434398831
TIC 434398831 b 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 |
|---|---|---|---|---|---|---|
| TIC 434398831 b this | Sub-Neptune | 3.51 | 12.10 | 3.686 | 1,250 | 2025 |
| TIC 434398831 c | Neptune-like | 5.63 | 27.00 | 6.210 | 1,050 | 2025 |
TIC 434398831 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#176of 1978
top 8.8%
This planet
3.51R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TIC 434398831 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.51 | 11.21 |
| Mass (M⊕) | 1.00 | 12.10 | 317.83 |
| Density (g/cm³) | 5.51 | 1.54 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.98 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Star Catalogue Identifiers
TIC
TIC 434398831
Gaia DR2
Gaia DR2 3369841304767966976
Gaia DR3
Gaia DR3 3369841304767966976
System
TIC 434398831
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.69 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0464 AU.
Transit Fingerprint
Duration
2.760 h
Rp / R★
0.035300
Transit midpoint (BJD)
2,458,468.6350
Extended Orbital Architecture
Planet / star radius ratio
0.035300
Semi-major axis / stellar radius
10.100
Transit mid-time (BJD)
2,458,468.6350
Long. of periastron (ω)
-61.00°
Angular separation (arcsec)
0.21400
Eq. Temperature
1,250K
(977 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.170
0 = alien, 1 = Earth-identical
Insufficient insolation data — the dayside is scorched.
Discovery Paper
Primary reference
Vach et al. 2025Instrument
TESS CCD Array
Publication
2025-06
Observation locale
Space
Discovery cohort
Planets confirmed in 2025 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TIC 434398831
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,638 K — cooler than the Sun (5,778 K)
Estimated Age
0.06 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.909 R☉
Stellar Mass
0.992 M☉
Metallicity [Fe/H]
-0.08
Extended Stellar Properties
Surface gravity (log g)
4.420 dex
Stellar density
1.797 g/cm³
Rotational v·sin i
32.16 km/s
Rotation period
1.75 days
Metallicity ratio
[m/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
4.580 mas
Total Proper Motion
17.333 mas/yr
PM Right Ascension
5.53 mas/yr
PM Declination
-16.43 mas/yr
Galactic Cartesian (pc)
x = -0.066 · y = 0.959 · z = 0.276
Equatorial (J2000)
RA 93.95926° · Dec 16.02385°
Galactic ℓ, b
194.663° · -0.371°
Ecliptic λ, β
93.833° · -7.363°
HTM-20 index
-911112918
Similar Worlds
Kepler-92 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.51 R⊕ · 1,559.0 ly
TOI-2196 b
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Kepler-177 b
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Radius 3.50 R⊕ · 4,681.8 ly
HD 45184 b
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Radius 3.52 R⊕ · 71.6 ly
Kepler-396 b
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Kepler-657 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.52 R⊕ · 5,518.2 ly