Key parameters at a glance
- A radius of 2.94 Earth radii
- A mass of 7.60 Earth masses
- Surface gravity around 0.88 g
- An orbital period of 11.197 days
- Semi-major axis 0.0903 AU
- Equilibrium temperature 686 K (413 °C)
- Distance from Earth 194.75 light-years
- Earth Similarity Index 0.338
- Travel time at Voyager 1 speed 3,434,474 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around TOI-815
TOI-815 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 |
|---|---|---|---|---|---|---|
| TOI-815 b this | Sub-Neptune | 2.94 | 7.60 | 11.197 | 686 | 2024 |
| TOI-815 c | Sub-Neptune | 2.62 | 23.50 | 34.976 | 469 | 2024 |
TOI-815 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#570of 1978
top 28.8%
This planet
2.94R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-815 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.94 | 11.21 |
| Mass (M⊕) | 1.00 | 7.60 | 317.83 |
| Density (g/cm³) | 5.51 | 1.64 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.88 | 2.53 |
| Insolation (S⊕) | 1.00 | 36.90 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 7.600 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 102840239
Gaia DR2
Gaia DR2 5415648821879172096
Gaia DR3
Gaia DR3 5415648821879172096
System
TOI-815
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 11.20 Earth days (3.1% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0903 AU.
Transit Fingerprint
Depth
0.130 %
Duration
3.379 h
Impact parameter b
0.279
Rp / R★
0.034900
Transit midpoint (BJD)
2,459,287.6028
Photometric dip
Transit produces a flux drop of 1,301 ppm lasting ≈ 3.38 h.
Extended Orbital Architecture
Planet / star radius ratio
0.034900
Semi-major axis / stellar radius
25.200
Impact parameter (b)
0.279
RV semi-amplitude (K)
2.600 m/s
Transit mid-time (BJD)
2,459,287.6028
Angular separation (arcsec)
1.51000
Eq. Temperature
686K
(413 °C)
Insolation (S⊕)
36.90
Earth = 1.00
Earth Similarity (ESI)
0.338
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
Psaridi 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-815
Spectral Class
K-type orange
Effective Temperature
4,869 K — cooler than the Sun (5,778 K)
Estimated Age
0.20 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.770 R☉
Stellar Mass
0.776 M☉
Metallicity [Fe/H]
-0.09
Extended Stellar Properties
Surface gravity (log g)
4.510 dex
Stellar density
2.431 g/cm³
Systemic radial velocity
-2.97 km/s
Rotational v·sin i
1.00 km/s
Rotation period
15.30 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
16.718 mas
Total Proper Motion
11.408 mas/yr
PM Right Ascension
8.93 mas/yr
PM Declination
7.10 mas/yr
Galactic Cartesian (pc)
x = -0.658 · y = 0.295 · z = -0.693
Equatorial (J2000)
RA 155.87194° · Dec -43.83492°
Galactic ℓ, b
276.658° · 11.361°
Ecliptic λ, β
180.428° · -48.827°
HTM-20 index
-1805516204
Similar Worlds
Kepler-1086 c
Sub-Neptune · K-type orange
Radius 2.94 R⊕ · 1,520.2 ly
TOI-178 g
Sub-Neptune · K-type orange
Radius 2.94 R⊕ · 204.5 ly
Kepler-1731 b
Sub-Neptune · K-type orange
Radius 2.93 R⊕ · 554.3 ly
K2-270 c
Sub-Neptune · K-type orange
Radius 2.95 R⊕ · 914.9 ly
K2-266 d
Sub-Neptune · K-type orange
Radius 2.93 R⊕ · 253.0 ly
HD 15906 c
Sub-Neptune · K-type orange
Radius 2.93 R⊕ · 148.6 ly