Key parameters at a glance
- A radius of 13.11 Earth radii
- A mass of 392.20 Earth masses
- Surface gravity around 2.28 g
- An orbital period of 11.237 days
- Semi-major axis 0.1041 AU
- Equilibrium temperature 1,252 K (979 °C)
- Distance from Earth 462.53 light-years
- Earth Similarity Index 0.113
- Travel time at Voyager 1 speed 8,156,687 years
TOI-677 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#907of 1771
top 51.2%
This planet
13.11R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-677 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 13.11 | 11.21 |
| Mass (M⊕) | 1.00 | 392.20 | 317.83 |
| Density (g/cm³) | 5.51 | 0.96 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.28 | 2.53 |
| Insolation (S⊕) | 1.00 | 37.63 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 392.200 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 280206394
Gaia DR2
Gaia DR2 5313031504751276032
Gaia DR3
Gaia DR3 5313031504751276032
System
TOI-677
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 11.24 Earth days (3.1% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.1041 AU.
Transit Fingerprint
Depth
0.941 %
Duration
2.535 h
Impact parameter b
0.709
Rp / R★
0.094040
Transit midpoint (BJD)
2,458,547.4745
Photometric dip
Transit produces a flux drop of 9,414 ppm lasting ≈ 2.54 h.
Extended Orbital Architecture
Planet / star radius ratio
0.094040
Semi-major axis / stellar radius
17.490
Impact parameter (b)
0.709
RV semi-amplitude (K)
112.900 m/s
Transit mid-time (BJD)
2,458,547.4745
Long. of periastron (ω)
72.90°
Sky-projected obliquity (λ)
3.20°
Angular separation (arcsec)
0.73400
Eq. Temperature
1,252K
(979 °C)
Insolation (S⊕)
37.63
Earth = 1.00
Earth Similarity (ESI)
0.113
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
Jord Aacute N et al. 2020Instrument
TESS CCD Array
Publication
2020-04
Observation locale
Space
Discovery cohort
Planets confirmed in 2020 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-677
Spectral Class
F-type yellow-white
Effective Temperature
6,295 K — hotter than the Sun (5,778 K)
Estimated Age
2.92 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.280 R☉
Stellar Mass
1.181 M☉
Metallicity [Fe/H]
0.00
Extended Stellar Properties
Surface gravity (log g)
4.291 dex
Stellar density
0.800 g/cm³
Rotational v·sin i
7.80 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
7.023 mas
Total Proper Motion
49.144 mas/yr
PM Right Ascension
-24.82 mas/yr
PM Declination
42.42 mas/yr
Galactic Cartesian (pc)
x = -0.516 · y = 0.373 · z = -0.771
Equatorial (J2000)
RA 144.11936° · Dec -50.46309°
Galactic ℓ, b
274.335° · 1.258°
Ecliptic λ, β
176.055° · -58.869°
HTM-20 index
-1604034335
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