Key parameters at a glance
- A radius of 2.36 Earth radii
- A mass of 4.80 Earth masses
- Surface gravity around 0.86 g
- An orbital period of 15.669 days
- Semi-major axis 0.1050 AU
- Equilibrium temperature 519 K (246 °C)
- Distance from Earth 78.04 light-years
- Earth Similarity Index 0.474
- Travel time at Voyager 1 speed 1,376,155 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-2443 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1393of 1978
top 70.4%
This planet
2.36R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-2443 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.36 | 11.21 |
| Mass (M⊕) | 1.00 | 4.80 | 317.83 |
| Density (g/cm³) | 5.51 | 2.00 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.86 | 2.53 |
| Insolation (S⊕) | 1.00 | 13.29 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 4.800 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HIP
HIP 12493
TIC
TIC 318753380
Gaia DR2
Gaia DR2 2501948402746099456
Gaia DR3
Gaia DR3 2501948402746099456
System
TOI-2443
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 15.67 Earth days (4.3% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.1050 AU.
Transit Fingerprint
Depth
0.139 %
Duration
4.548 h
Impact parameter b
0.220
Rp / R★
0.034360
Transit midpoint (BJD)
2,459,148.0994
Photometric dip
Transit produces a flux drop of 1,393 ppm lasting ≈ 4.55 h.
Extended Orbital Architecture
Planet / star radius ratio
0.034360
Semi-major axis / stellar radius
35.800
Impact parameter (b)
0.220
RV semi-amplitude (K)
1.740 m/s
Transit mid-time (BJD)
2,459,148.0994
Long. of periastron (ω)
-86.00°
Angular separation (arcsec)
4.39000
Eq. Temperature
519K
(246 °C)
Insolation (S⊕)
13.29
Earth = 1.00
Earth Similarity (ESI)
0.474
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
Mistry et al. 2023Instrument
TESS CCD Array
Publication
2023-01
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-2443
Spectral Class
K-type orange
Effective Temperature
4,375 K — cooler than the Sun (5,778 K)
Estimated Age
7.50 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.631 R☉
Stellar Mass
0.642 M☉
Metallicity [Fe/H]
-0.29
Extended Stellar Properties
Surface gravity (log g)
4.420 dex
Stellar density
3.610 g/cm³
Rotational v·sin i
1.70 km/s
Activity index (log R'HK)
-5.004
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 8 bands
Astrometric Data
Parallax
41.767 mas
Total Proper Motion
366.585 mas/yr
PM Right Ascension
284.01 mas/yr
PM Declination
231.78 mas/yr
Galactic Cartesian (pc)
x = 0.764 · y = 0.645 · z = 0.021
Equatorial (J2000)
RA 40.17986° · Dec 1.19968°
Galactic ℓ, b
170.216° · -51.352°
Ecliptic λ, β
38.152° · -13.732°
HTM-20 index
-1221946290
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