Key parameters at a glance
- A radius of 3.49 Earth radii
- A mass of 16.15 Earth masses
- Surface gravity around 1.33 g
- An orbital period of 23.443 days
- Semi-major axis 0.1481 AU
- Equilibrium temperature 550 K (277 °C)
- Distance from Earth 270.24 light-years
- Earth Similarity Index 0.415
- Travel time at Voyager 1 speed 4,765,736 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-5076 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#188of 1978
top 9.5%
This planet
3.49R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-5076 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.49 | 11.21 |
| Mass (M⊕) | 1.00 | 16.15 | 317.83 |
| Density (g/cm³) | 5.51 | 2.08 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.33 | 2.53 |
| Insolation (S⊕) | 1.00 | 12.84 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 16.146 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HIP
HIP 15683
TIC
TIC 303432813
Gaia DR2
Gaia DR2 55752218851048320
Gaia DR3
Gaia DR3 55752218851048320
System
TOI-5076
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 23.44 Earth days (6.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1481 AU.
Transit Fingerprint
Depth
0.144 %
Duration
4.882 h
Impact parameter b
0.107
Rp / R★
0.037930
Transit midpoint (BJD)
2,460,204.0018
Photometric dip
Transit produces a flux drop of 1,439 ppm lasting ≈ 4.88 h.
Extended Orbital Architecture
Planet / star radius ratio
0.037930
Semi-major axis / stellar radius
34.000
Impact parameter (b)
0.107
RV semi-amplitude (K)
4.230 m/s
Transit mid-time (BJD)
2,460,204.0018
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
1.79000
Eq. Temperature
550K
(277 °C)
Insolation (S⊕)
12.84
Earth = 1.00
Earth Similarity (ESI)
0.415
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
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
Montalto 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-5076
Spectral Class
K-type orange
Effective Temperature
4,780 K — cooler than the Sun (5,778 K)
Estimated Age
8.40 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.844 R☉
Stellar Mass
0.789 M☉
Metallicity [Fe/H]
0.08
Extended Stellar Properties
Surface gravity (log g)
4.483 dex
Stellar density
1.857 g/cm³
Systemic radial velocity
70.28 km/s
Rotational v·sin i
2.30 km/s
Rotation period
57.00 days
Activity index (log R'HK)
-5.100
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
12.040 mas
Total Proper Motion
243.841 mas/yr
PM Right Ascension
168.79 mas/yr
PM Declination
-175.98 mas/yr
Galactic Cartesian (pc)
x = 0.607 · y = 0.737 · z = 0.296
Equatorial (J2000)
RA 50.51042° · Dec 17.23921°
Galactic ℓ, b
166.723° · -32.538°
Ecliptic λ, β
52.587° · -1.220°
HTM-20 index
1211237330
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