Key parameters at a glance
- A radius of 8.05 Earth radii
- A mass of 96.00 Earth masses
- Surface gravity around 1.48 g
- An orbital period of 10.241 days
- Semi-major axis 0.0800 AU
- Equilibrium temperature 708 K (435 °C)
- Distance from Earth 486.74 light-years
- Earth Similarity Index 0.239
- Travel time at Voyager 1 speed 8,583,583 years
TOI-1775 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#154of 574
top 26.7%
This planet
8.05R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | TOI-1775 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 8.05 | 11.21 |
| Mass (M⊕) | 1.00 | 96.00 | 317.83 |
| Density (g/cm³) | 5.51 | 1.01 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.48 | 2.53 |
| Insolation (S⊕) | 1.00 | 55.44 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 96.000 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 9348006
Gaia DR2
Gaia DR2 803285607362611840
Gaia DR3
Gaia DR3 803285607362611840
System
TOI-1775
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 10.24 Earth days (2.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0800 AU.
Transit Fingerprint
Depth
0.995 %
Duration
3.664 h
Impact parameter b
0.175
Rp / R★
0.089020
Transit midpoint (BJD)
2,458,877.5645
Photometric dip
Transit produces a flux drop of 9,950 ppm lasting ≈ 3.66 h.
Extended Orbital Architecture
Planet / star radius ratio
0.089020
Impact parameter (b)
0.175
RV semi-amplitude (K)
29.800 m/s
Transit mid-time (BJD)
2,458,877.5645
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
0.53600
Eq. Temperature
708K
(435 °C)
Insolation (S⊕)
55.44
Earth = 1.00
Earth Similarity (ESI)
0.239
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
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-1775
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,284 K — cooler than the Sun (5,778 K)
Estimated Age
0.80 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.829 R☉
Stellar Mass
0.922 M☉
Metallicity [Fe/H]
0.16
Extended Stellar Properties
Surface gravity (log g)
4.565 dex
Stellar density
2.269 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
6.672 mas
Total Proper Motion
16.373 mas/yr
PM Right Ascension
-5.84 mas/yr
PM Declination
-15.30 mas/yr
Galactic Cartesian (pc)
x = -0.669 · y = 0.385 · z = 0.636
Equatorial (J2000)
RA 150.11510° · Dec 39.45775°
Galactic ℓ, b
182.565° · 52.601°
Ecliptic λ, β
137.855° · 25.470°
HTM-20 index
493413433
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