Key parameters at a glance
- A radius of 1.22 Earth radii
- A mass of 1.40 Earth masses
- Surface gravity around 0.95 g
- An orbital period of 2.800 days
- Semi-major axis 0.0378 AU
- Equilibrium temperature 1,269 K (996 °C)
- Distance from Earth 145.62 light-years
- Earth Similarity Index 0.235
- Travel time at Voyager 1 speed 2,567,989 years
TOI-1776 b Planet Profile
Physical Specs
Classification
Planet Type
Rocky Terrestrial
Discovery
Size rank in cohort
Rank by radius
#52of 570
top 8.9%
This planet
1.22R⊕
Rocky Terrestrial median
1.01R⊕
Nearest-size peers
| Metric | Earth | TOI-1776 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.22 | 11.21 |
| Mass (M⊕) | 1.00 | 1.40 | 317.83 |
| Density (g/cm³) | 5.51 | 4.13 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.95 | 2.53 |
| Insolation (S⊕) | 1.00 | 560.33 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 1.400 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HIP
HIP 53688
TIC
TIC 21535395
Gaia DR2
Gaia DR2 778052193462283648
Gaia DR3
Gaia DR3 778052193462283648
System
TOI-1776
Percentile among Rocky Terrestrial cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.80 Earth days (0.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0378 AU.
Transit Fingerprint
Depth
0.020 %
Duration
1.932 h
Impact parameter b
0.507
Rp / R★
0.011917
Transit midpoint (BJD)
2,458,871.4976
Photometric dip
Transit produces a flux drop of 205 ppm lasting ≈ 1.93 h.
Extended Orbital Architecture
Planet / star radius ratio
0.011917
Impact parameter (b)
0.507
RV semi-amplitude (K)
0.680 m/s
Transit mid-time (BJD)
2,458,871.4976
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
0.84700
Eq. Temperature
1,269K
(996 °C)
Insolation (S⊕)
560.33
Earth = 1.00
Earth Similarity (ESI)
0.235
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
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-1776
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,785 K — hotter than the Sun (5,778 K)
Estimated Age
5.10 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.936 R☉
Stellar Mass
0.920 M☉
Metallicity [Fe/H]
-0.19
Extended Stellar Properties
Surface gravity (log g)
4.457 dex
Stellar density
1.568 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
22.369 mas
Total Proper Motion
216.228 mas/yr
PM Right Ascension
214.70 mas/yr
PM Declination
25.65 mas/yr
Galactic Cartesian (pc)
x = -0.728 · y = 0.198 · z = 0.656
Equatorial (J2000)
RA 164.77729° · Dec 40.98372°
Galactic ℓ, b
174.696° · 63.101°
Ecliptic λ, β
148.704° · 31.526°
HTM-20 index
-1779347942
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