Key parameters at a glance
- A radius of 2.60 Earth radii
- A mass of 8.00 Earth masses
- Surface gravity around 1.18 g
- An orbital period of 1.773 days
- Semi-major axis 0.0309 AU
- Equilibrium temperature 2,008 K (1734 °C)
- Distance from Earth 625.07 light-years
- Earth Similarity Index 0.115
- Travel time at Voyager 1 speed 11,023,192 years
1 sibling around TOI-1836
TOI-1836 c 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-1836 c this | Sub-Neptune | 2.60 | 8.00 | 1.773 | 2,008 | 2024 |
| TOI-1836 b | Neptune-like | 8.00 | 38.46 | 20.381 | 966 | 2024 |
TOI-1836 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1038of 1978
top 52.4%
This planet
2.60R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-1836 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.60 | 11.21 |
| Mass (M⊕) | 1.00 | 8.00 | 317.83 |
| Density (g/cm³) | 5.51 | 3.00 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.18 | 2.53 |
| Insolation (S⊕) | 1.00 | 2,981.98 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 8.000 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 148193
TIC
TIC 207468071
Gaia DR2
Gaia DR2 1428639816392087552
Gaia DR3
Gaia DR3 1428639816392087552
System
TOI-1836
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 1.77 Earth days (0.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0309 AU.
Transit Fingerprint
Depth
0.024 %
Duration
1.787 h
Impact parameter b
0.623
Rp / R★
0.014486
Transit midpoint (BJD)
2,459,739.6700
Photometric dip
Transit produces a flux drop of 243 ppm lasting ≈ 1.79 h.
Extended Orbital Architecture
Planet / star radius ratio
0.014486
Impact parameter (b)
0.623
Transit mid-time (BJD)
2,459,739.6700
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
0.16100
Eq. Temperature
2,008K
(1734 °C)
Insolation (S⊕)
2,981.98
Earth = 1.00
Earth Similarity (ESI)
0.115
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
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-1836
Spectral Class
F-type yellow-white
Effective Temperature
6,237 K — hotter than the Sun (5,778 K)
Estimated Age
3.20 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.645 R☉
Stellar Mass
1.252 M☉
Metallicity [Fe/H]
-0.14
Extended Stellar Properties
Surface gravity (log g)
4.098 dex
Stellar density
0.390 g/cm³
Rotational v·sin i
6.30 km/s
Rotation period
20.00 days
Activity index (log R'HK)
-5.000
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
5.189 mas
Total Proper Motion
82.588 mas/yr
PM Right Ascension
-38.23 mas/yr
PM Declination
73.21 mas/yr
Galactic Cartesian (pc)
x = -0.236 · y = -0.528 · z = 0.816
Equatorial (J2000)
RA 245.90792° · Dec 54.69008°
Galactic ℓ, b
83.805° · 42.948°
Ecliptic λ, β
214.057° · 73.453°
HTM-20 index
-335099315
Similar Worlds
Kepler-122 e
Sub-Neptune · F-type yellow-white
Radius 2.60 R⊕ · 3,351.1 ly
Kepler-84 e
Sub-Neptune · F-type yellow-white
Radius 2.60 R⊕ · 3,339.5 ly
Kepler-911 b
Sub-Neptune · F-type yellow-white
Radius 2.60 R⊕ · 1,814.0 ly
Kepler-1233 b
Sub-Neptune · F-type yellow-white
Radius 2.60 R⊕ · 3,844.4 ly
HIP 41378 b
Sub-Neptune · F-type yellow-white
Radius 2.60 R⊕ · 346.7 ly
HD 22946 d
Sub-Neptune · F-type yellow-white
Radius 2.61 R⊕ · 204.8 ly