Key parameters at a glance
- A radius of 2.95 Earth radii
- A mass of 19.50 Earth masses
- Surface gravity around 2.24 g
- An orbital period of 37.469 days
- Semi-major axis 0.2150 AU
- Equilibrium temperature 652 K (378 °C)
- Distance from Earth 369.65 light-years
- Earth Similarity Index 0.398
- Travel time at Voyager 1 speed 6,518,758 years
TOI-1751 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#556of 1978
top 28.1%
This planet
2.95R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-1751 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.95 | 11.21 |
| Mass (M⊕) | 1.00 | 19.50 | 317.83 |
| Density (g/cm³) | 5.51 | 4.13 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.24 | 2.53 |
| Insolation (S⊕) | 1.00 | 192.52 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 19.500 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 287080092
Gaia DR2
Gaia DR2 1629404184289170688
Gaia DR3
Gaia DR3 1629404184289170688
System
TOI-1751
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 37.47 Earth days (10.3% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.2150 AU.
Transit Fingerprint
Depth
0.043 %
Duration
7.651 h
Impact parameter b
0.390
Rp / R★
0.020592
Transit midpoint (BJD)
2,458,733.6350
Photometric dip
Transit produces a flux drop of 429 ppm lasting ≈ 7.65 h.
Extended Orbital Architecture
Planet / star radius ratio
0.020592
Semi-major axis / stellar radius
38.000
Impact parameter (b)
0.390
RV semi-amplitude (K)
4.150 m/s
Transit mid-time (BJD)
2,458,733.6350
Long. of periastron (ω)
120.00°
Angular separation (arcsec)
1.90000
Eq. Temperature
652K
(378 °C)
Insolation (S⊕)
192.52
Earth = 1.00
Earth Similarity (ESI)
0.398
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
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
Desai et al. 2024Instrument
TESS CCD Array
Publication
2024-02
Observation locale
Space
Discovery cohort
Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-1751
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,970 K — hotter than the Sun (5,778 K)
Estimated Age
9.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.314 R☉
Stellar Mass
0.938 M☉
Metallicity [Fe/H]
-0.37
Extended Stellar Properties
Surface gravity (log g)
4.171 dex
Stellar density
0.578 g/cm³
Rotational v·sin i
1.27 km/s
Activity index (log R'HK)
-5.149
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
8.795 mas
Total Proper Motion
173.012 mas/yr
PM Right Ascension
8.35 mas/yr
PM Declination
-172.81 mas/yr
Galactic Cartesian (pc)
x = -0.199 · y = -0.399 · z = 0.895
Equatorial (J2000)
RA 243.48885° · Dec 63.53353°
Galactic ℓ, b
95.642° · 41.285°
Ecliptic λ, β
182.820° · 78.511°
HTM-20 index
247922425
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