Key parameters at a glance
- A radius of 11.68 Earth radii
- A mass of 99.80 Earth masses
- Surface gravity around 0.73 g
- An orbital period of 4.124 days
- Semi-major axis 0.0529 AU
- Equilibrium temperature 1,445 K (1172 °C)
- Distance from Earth 1,610.46 light-years
- Earth Similarity Index 0.083
- Travel time at Voyager 1 speed 28,400,469 years
TOI-3877 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1568of 1771
top 88.5%
This planet
11.68R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-3877 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 11.68 | 11.21 |
| Mass (M⊕) | 1.00 | 99.80 | 317.83 |
| Density (g/cm³) | 5.51 | 0.34 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.73 | 2.53 |
| Insolation (S⊕) | 1.00 | 729.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 99.798 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 144310492
Gaia DR2
Gaia DR2 759209995840837248
Gaia DR3
Gaia DR3 759209995840837248
System
TOI-3877
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.12 Earth days (1.1% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0529 AU.
Transit Fingerprint
Depth
0.550 %
Duration
2.784 h
Impact parameter b
0.824
Transit midpoint (BJD)
2,459,753.9339
Photometric dip
Transit produces a flux drop of 5,500 ppm lasting ≈ 2.78 h.
Extended Orbital Architecture
Semi-major axis / stellar radius
7.850
Impact parameter (b)
0.824
RV semi-amplitude (K)
36.100 m/s
Transit mid-time (BJD)
2,459,753.9339
Angular separation (arcsec)
0.10700
Eq. Temperature
1,445K
(1172 °C)
Insolation (S⊕)
729.00
Earth = 1.00
Earth Similarity (ESI)
0.083
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
Yee et al. 2025Instrument
TESS CCD Array
Publication
2025-07
Observation locale
Space
Discovery cohort
Planets confirmed in 2025 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-3877
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,731 K — cooler than the Sun (5,778 K)
Estimated Age
5.90 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.445 R☉
Stellar Mass
1.160 M☉
Metallicity [Fe/H]
0.27
Extended Stellar Properties
Surface gravity (log g)
4.181 dex
Stellar density
0.538 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.997 mas
Total Proper Motion
20.354 mas/yr
PM Right Ascension
-20.00 mas/yr
PM Declination
-3.80 mas/yr
Galactic Cartesian (pc)
x = -0.818 · y = 0.137 · z = 0.559
Equatorial (J2000)
RA 170.45447° · Dec 33.99138°
Galactic ℓ, b
187.832° · 69.575°
Ecliptic λ, β
156.909° · 27.274°
HTM-20 index
-1130708694
Similar Worlds
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