Key parameters at a glance
- A radius of 8.14 Earth radii
- A mass of 81.70 Earth masses
- Surface gravity around 1.23 g
- An orbital period of 9.127 days
- Semi-major axis 0.0878 AU
- Equilibrium temperature 1,038 K (765 °C)
- Distance from Earth 573.10 light-years
- Earth Similarity Index 0.155
- Travel time at Voyager 1 speed 10,106,591 years
1 sibling around TOI-2000
TOI-2000 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-2000 b | Sub-Neptune | 2.70 | 11.00 | 3.098 | 1,488 | 2023 |
| TOI-2000 c this | Neptune-like | 8.14 | 81.70 | 9.127 | 1,038 | 2023 |
TOI-2000 c Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#149of 574
top 25.8%
This planet
8.14R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | TOI-2000 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 8.14 | 11.21 |
| Mass (M⊕) | 1.00 | 81.70 | 317.83 |
| Density (g/cm³) | 5.51 | 0.83 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.23 | 2.53 |
| Insolation (S⊕) | 1.00 | 149.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 81.700 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 371188886
Gaia DR2
Gaia DR2 5244434756689177088
Gaia DR3
Gaia DR3 5244434756689177088
System
TOI-2000
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 9.13 Earth days (2.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0878 AU.
Transit Fingerprint
Depth
0.457 %
Duration
3.654 h
Impact parameter b
0.631
Rp / R★
0.065810
Transit midpoint (BJD)
2,459,110.0659
Photometric dip
Transit produces a flux drop of 4,568 ppm lasting ≈ 3.65 h.
Extended Orbital Architecture
Planet / star radius ratio
0.065810
Semi-major axis / stellar radius
16.640
Impact parameter (b)
0.631
RV semi-amplitude (K)
23.700 m/s
Transit mid-time (BJD)
2,459,110.0659
Long. of periastron (ω)
196.00°
Angular separation (arcsec)
0.50000
Eq. Temperature
1,038K
(765 °C)
Insolation (S⊕)
149.00
Earth = 1.00
Earth Similarity (ESI)
0.155
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
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
Sha et al. 2023Instrument
TESS CCD Array
Publication
2023-06
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-2000
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,611 K — cooler than the Sun (5,778 K)
Estimated Age
5.30 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.134 R☉
Stellar Mass
1.082 M☉
Metallicity [Fe/H]
0.44
Extended Stellar Properties
Surface gravity (log g)
4.363 dex
Stellar density
1.047 g/cm³
Rotational v·sin i
2.99 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
5.662 mas
Total Proper Motion
74.393 mas/yr
PM Right Ascension
-73.32 mas/yr
PM Declination
12.58 mas/yr
Galactic Cartesian (pc)
x = -0.330 · y = 0.219 · z = -0.918
Equatorial (J2000)
RA 146.39706° · Dec -66.68663°
Galactic ℓ, b
285.987° · -10.145°
Ecliptic λ, β
206.496° · -68.388°
HTM-20 index
-1190228585
Similar Worlds
Kepler-35 b
Neptune-like · G-type yellow (Sun-like)
Radius 8.16 R⊕ · 5,933.3 ly
Kepler-108 c
Neptune-like · G-type yellow (Sun-like)
Radius 8.18 R⊕ · 1,104.8 ly
HD 13724 c
Neptune-like · G-type yellow (Sun-like)
Radius 8.18 R⊕ · 141.8 ly
Kepler-849 b
Neptune-like · G-type yellow (Sun-like)
Radius 8.08 R⊕ · 2,681.4 ly
Kepler-9 c
Neptune-like · G-type yellow (Sun-like)
Radius 8.08 R⊕ · 2,049.1 ly
TOI-1775 b
Neptune-like · G-type yellow (Sun-like)
Radius 8.05 R⊕ · 486.7 ly