Key parameters at a glance
- A radius of 2.54 Earth radii
- A mass of 6.98 Earth masses
- Surface gravity around 1.08 g
- An orbital period of 14.176 days
- Semi-major axis 0.1074 AU
- Equilibrium temperature 708 K (435 °C)
- Distance from Earth 210.69 light-years
- Earth Similarity Index 0.356
- Travel time at Voyager 1 speed 3,715,511 years
4 siblings around HD 108236
TOI-1233.01 shares its host star with 4 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| HD 108236 b | Super-Earth | 1.62 | 3.24 | 3.796 | 1,099 | 2020 |
| HD 108236 c | Sub-Neptune | 2.07 | 4.94 | 6.203 | 932 | 2020 |
| TOI-1233.01 this | Sub-Neptune | 2.54 | 6.98 | 14.176 | 708 | 2021 |
| HD 108236 e | Sub-Neptune | 3.08 | 9.71 | 19.590 | 636 | 2020 |
| HD 108236 f | Sub-Neptune | 2.02 | 4.72 | 29.541 | — | 2021 |
TOI-1233.01 Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1131of 1978
top 57.1%
This planet
2.54R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-1233.01 | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.54 | 11.21 |
| Mass (M⊕) | 1.00 | 6.98 | 317.83 |
| Density (g/cm³) | 5.51 | 2.34 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.08 | 2.53 |
| Insolation (S⊕) | 1.00 | 53.88 | 0.037 |
Star Catalogue Identifiers
HD
HD 108236
HIP
HIP 60689
TIC
TIC 260647166
Gaia DR2
Gaia DR2 6125644402384918784
Gaia DR3
Gaia DR3 6125644402384918784
System
HD 108236
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 14.18 Earth days (3.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1074 AU.
Transit Fingerprint
Depth
0.071 %
Duration
3.850 h
Impact parameter b
0.423
Rp / R★
0.028050
Transit midpoint (BJD)
2,458,769.7968
Photometric dip
Transit produces a flux drop of 705 ppm lasting ≈ 3.85 h.
Extended Orbital Architecture
Planet / star radius ratio
0.028050
Semi-major axis / stellar radius
27.390
Impact parameter (b)
0.423
Transit mid-time (BJD)
2,458,769.7968
Long. of periastron (ω)
151.00°
Angular separation (arcsec)
1.66000
Eq. Temperature
708K
(435 °C)
Insolation (S⊕)
53.88
Earth = 1.00
Earth Similarity (ESI)
0.356
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
Discovery Paper
Primary reference
Giacalone et al. 2021Instrument
TESS CCD Array
Publication
2021-01
Observation locale
Space
Discovery cohort
Planets confirmed in 2021 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: HD 108236
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,660 K — cooler than the Sun (5,778 K)
Estimated Age
6.70 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.877 R☉
Stellar Mass
0.869 M☉
Metallicity [Fe/H]
-0.28
Extended Stellar Properties
Surface gravity (log g)
4.490 dex
Stellar density
1.820 g/cm³
Systemic radial velocity
16.30 km/s
Rotational v·sin i
4.70 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
15.452 mas
Total Proper Motion
86.299 mas/yr
PM Right Ascension
-70.43 mas/yr
PM Declination
-49.87 mas/yr
Galactic Cartesian (pc)
x = -0.620 · y = -0.071 · z = -0.781
Equatorial (J2000)
RA 186.57406° · Dec -51.36305°
Galactic ℓ, b
298.934° · 11.313°
Ecliptic λ, β
211.240° · -43.490°
HTM-20 index
-10948854
Similar Worlds
Kepler-325 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.54 R⊕ · 2,685.1 ly
HD 189567 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.54 R⊕ · 58.4 ly
K2-351 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.54 R⊕ · 2,265.9 ly
Kepler-1116 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.54 R⊕ · 3,289.5 ly
Kepler-902 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.54 R⊕ · 3,800.8 ly
HD 35843 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.54 R⊕ · 227.0 ly